1 /*
   2  * Copyright (c) 2012, 2024, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 /*
  27  * This file is available under and governed by the GNU General Public
  28  * License version 2 only, as published by the Free Software Foundation.
  29  * However, the following notice accompanied the original version of this
  30  * file:
  31  *
  32  * Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos
  33  *
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions are met:
  38  *
  39  *  * Redistributions of source code must retain the above copyright notice,
  40  *    this list of conditions and the following disclaimer.
  41  *
  42  *  * Redistributions in binary form must reproduce the above copyright notice,
  43  *    this list of conditions and the following disclaimer in the documentation
  44  *    and/or other materials provided with the distribution.
  45  *
  46  *  * Neither the name of JSR-310 nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  54  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  55  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  56  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  57  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  58  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  59  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  60  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  */
  62 package java.time;
  63 
  64 import static java.time.LocalTime.HOURS_PER_DAY;
  65 import static java.time.LocalTime.MICROS_PER_DAY;
  66 import static java.time.LocalTime.MILLIS_PER_DAY;
  67 import static java.time.LocalTime.MINUTES_PER_DAY;
  68 import static java.time.LocalTime.NANOS_PER_DAY;
  69 import static java.time.LocalTime.NANOS_PER_HOUR;
  70 import static java.time.LocalTime.NANOS_PER_MINUTE;
  71 import static java.time.LocalTime.NANOS_PER_SECOND;
  72 import static java.time.LocalTime.SECONDS_PER_DAY;
  73 import static java.time.temporal.ChronoField.NANO_OF_SECOND;
  74 
  75 import java.io.DataInput;
  76 import java.io.DataOutput;
  77 import java.io.IOException;
  78 import java.io.InvalidObjectException;
  79 import java.io.ObjectInputStream;
  80 import java.io.Serializable;
  81 import java.time.chrono.ChronoLocalDateTime;
  82 import java.time.format.DateTimeFormatter;
  83 import java.time.format.DateTimeParseException;
  84 import java.time.temporal.ChronoField;
  85 import java.time.temporal.ChronoUnit;
  86 import java.time.temporal.Temporal;
  87 import java.time.temporal.TemporalAccessor;
  88 import java.time.temporal.TemporalAdjuster;
  89 import java.time.temporal.TemporalAmount;
  90 import java.time.temporal.TemporalField;
  91 import java.time.temporal.TemporalQueries;
  92 import java.time.temporal.TemporalQuery;
  93 import java.time.temporal.TemporalUnit;
  94 import java.time.temporal.UnsupportedTemporalTypeException;
  95 import java.time.temporal.ValueRange;
  96 import java.time.zone.ZoneRules;
  97 import java.util.Objects;
  98 
  99 /**
 100  * A date-time without a time-zone in the ISO-8601 calendar system,
 101  * such as {@code 2007-12-03T10:15:30}.
 102  * <p>
 103  * {@code LocalDateTime} is an immutable date-time object that represents a date-time,
 104  * often viewed as year-month-day-hour-minute-second. Other date and time fields,
 105  * such as day-of-year, day-of-week and week-of-year, can also be accessed.
 106  * Time is represented to nanosecond precision.
 107  * For example, the value "2nd October 2007 at 13:45.30.123456789" can be
 108  * stored in a {@code LocalDateTime}.
 109  * <p>
 110  * This class does not store or represent a time-zone.
 111  * Instead, it is a description of the date, as used for birthdays, combined with
 112  * the local time as seen on a wall clock.
 113  * It cannot represent an instant on the time-line without additional information
 114  * such as an offset or time-zone.
 115  * <p>
 116  * The ISO-8601 calendar system is the modern civil calendar system used today
 117  * in most of the world. It is equivalent to the proleptic Gregorian calendar
 118  * system, in which today's rules for leap years are applied for all time.
 119  * For most applications written today, the ISO-8601 rules are entirely suitable.
 120  * However, any application that makes use of historical dates, and requires them
 121  * to be accurate will find the ISO-8601 approach unsuitable.
 122  * <p>
 123  * This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
 124  * class; programmers should treat instances that are
 125  * {@linkplain #equals(Object) equal} as interchangeable and should not
 126  * use instances for synchronization, or unpredictable behavior may
 127  * occur. For example, in a future release, synchronization may fail.
 128  * The {@code equals} method should be used for comparisons.
 129  *
 130  * @implSpec
 131  * This class is immutable and thread-safe.
 132  *
 133  * @since 1.8
 134  */
 135 @jdk.internal.ValueBased
 136 @jdk.internal.MigratedValueClass
 137 public final class LocalDateTime
 138         implements Temporal, TemporalAdjuster, ChronoLocalDateTime<LocalDate>, Serializable {
 139 
 140     /**
 141      * The minimum supported {@code LocalDateTime}, '-999999999-01-01T00:00:00'.
 142      * This is the local date-time of midnight at the start of the minimum date.
 143      * This combines {@link LocalDate#MIN} and {@link LocalTime#MIN}.
 144      * This could be used by an application as a "far past" date-time.
 145      */
 146     public static final LocalDateTime MIN = LocalDateTime.of(LocalDate.MIN, LocalTime.MIN);
 147     /**
 148      * The maximum supported {@code LocalDateTime}, '+999999999-12-31T23:59:59.999999999'.
 149      * This is the local date-time just before midnight at the end of the maximum date.
 150      * This combines {@link LocalDate#MAX} and {@link LocalTime#MAX}.
 151      * This could be used by an application as a "far future" date-time.
 152      */
 153     public static final LocalDateTime MAX = LocalDateTime.of(LocalDate.MAX, LocalTime.MAX);
 154 
 155     /**
 156      * Serialization version.
 157      */
 158     @java.io.Serial
 159     private static final long serialVersionUID = 6207766400415563566L;
 160 
 161     /**
 162      * The date part.
 163      */
 164     private final LocalDate date;
 165     /**
 166      * The time part.
 167      */
 168     private final LocalTime time;
 169 
 170     //-----------------------------------------------------------------------
 171     /**
 172      * Obtains the current date-time from the system clock in the default time-zone.
 173      * <p>
 174      * This will query the {@link Clock#systemDefaultZone() system clock} in the default
 175      * time-zone to obtain the current date-time.
 176      * <p>
 177      * Using this method will prevent the ability to use an alternate clock for testing
 178      * because the clock is hard-coded.
 179      *
 180      * @return the current date-time using the system clock and default time-zone, not null
 181      */
 182     public static LocalDateTime now() {
 183         return now(Clock.systemDefaultZone());
 184     }
 185 
 186     /**
 187      * Obtains the current date-time from the system clock in the specified time-zone.
 188      * <p>
 189      * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date-time.
 190      * Specifying the time-zone avoids dependence on the default time-zone.
 191      * <p>
 192      * Using this method will prevent the ability to use an alternate clock for testing
 193      * because the clock is hard-coded.
 194      *
 195      * @param zone  the zone ID to use, not null
 196      * @return the current date-time using the system clock, not null
 197      */
 198     public static LocalDateTime now(ZoneId zone) {
 199         return now(Clock.system(zone));
 200     }
 201 
 202     /**
 203      * Obtains the current date-time from the specified clock.
 204      * <p>
 205      * This will query the specified clock to obtain the current date-time.
 206      * Using this method allows the use of an alternate clock for testing.
 207      * The alternate clock may be introduced using {@link Clock dependency injection}.
 208      *
 209      * @param clock  the clock to use, not null
 210      * @return the current date-time, not null
 211      */
 212     public static LocalDateTime now(Clock clock) {
 213         Objects.requireNonNull(clock, "clock");
 214         final Instant now = clock.instant();  // called once
 215         ZoneOffset offset = clock.getZone().getRules().getOffset(now);
 216         return ofEpochSecond(now.getEpochSecond(), now.getNano(), offset);
 217     }
 218 
 219     //-----------------------------------------------------------------------
 220     /**
 221      * Obtains an instance of {@code LocalDateTime} from year, month,
 222      * day, hour and minute, setting the second and nanosecond to zero.
 223      * <p>
 224      * This returns a {@code LocalDateTime} with the specified year, month,
 225      * day-of-month, hour and minute.
 226      * The day must be valid for the year and month, otherwise an exception will be thrown.
 227      * The second and nanosecond fields will be set to zero.
 228      *
 229      * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
 230      * @param month  the month-of-year to represent, not null
 231      * @param dayOfMonth  the day-of-month to represent, from 1 to 31
 232      * @param hour  the hour-of-day to represent, from 0 to 23
 233      * @param minute  the minute-of-hour to represent, from 0 to 59
 234      * @return the local date-time, not null
 235      * @throws DateTimeException if the value of any field is out of range,
 236      *  or if the day-of-month is invalid for the month-year
 237      */
 238     public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute) {
 239         LocalDate date = LocalDate.of(year, month, dayOfMonth);
 240         LocalTime time = LocalTime.of(hour, minute);
 241         return new LocalDateTime(date, time);
 242     }
 243 
 244     /**
 245      * Obtains an instance of {@code LocalDateTime} from year, month,
 246      * day, hour, minute and second, setting the nanosecond to zero.
 247      * <p>
 248      * This returns a {@code LocalDateTime} with the specified year, month,
 249      * day-of-month, hour, minute and second.
 250      * The day must be valid for the year and month, otherwise an exception will be thrown.
 251      * The nanosecond field will be set to zero.
 252      *
 253      * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
 254      * @param month  the month-of-year to represent, not null
 255      * @param dayOfMonth  the day-of-month to represent, from 1 to 31
 256      * @param hour  the hour-of-day to represent, from 0 to 23
 257      * @param minute  the minute-of-hour to represent, from 0 to 59
 258      * @param second  the second-of-minute to represent, from 0 to 59
 259      * @return the local date-time, not null
 260      * @throws DateTimeException if the value of any field is out of range,
 261      *  or if the day-of-month is invalid for the month-year
 262      */
 263     public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute, int second) {
 264         LocalDate date = LocalDate.of(year, month, dayOfMonth);
 265         LocalTime time = LocalTime.of(hour, minute, second);
 266         return new LocalDateTime(date, time);
 267     }
 268 
 269     /**
 270      * Obtains an instance of {@code LocalDateTime} from year, month,
 271      * day, hour, minute, second and nanosecond.
 272      * <p>
 273      * This returns a {@code LocalDateTime} with the specified year, month,
 274      * day-of-month, hour, minute, second and nanosecond.
 275      * The day must be valid for the year and month, otherwise an exception will be thrown.
 276      *
 277      * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
 278      * @param month  the month-of-year to represent, not null
 279      * @param dayOfMonth  the day-of-month to represent, from 1 to 31
 280      * @param hour  the hour-of-day to represent, from 0 to 23
 281      * @param minute  the minute-of-hour to represent, from 0 to 59
 282      * @param second  the second-of-minute to represent, from 0 to 59
 283      * @param nanoOfSecond  the nano-of-second to represent, from 0 to 999,999,999
 284      * @return the local date-time, not null
 285      * @throws DateTimeException if the value of any field is out of range,
 286      *  or if the day-of-month is invalid for the month-year
 287      */
 288     public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond) {
 289         LocalDate date = LocalDate.of(year, month, dayOfMonth);
 290         LocalTime time = LocalTime.of(hour, minute, second, nanoOfSecond);
 291         return new LocalDateTime(date, time);
 292     }
 293 
 294     //-----------------------------------------------------------------------
 295     /**
 296      * Obtains an instance of {@code LocalDateTime} from year, month,
 297      * day, hour and minute, setting the second and nanosecond to zero.
 298      * <p>
 299      * This returns a {@code LocalDateTime} with the specified year, month,
 300      * day-of-month, hour and minute.
 301      * The day must be valid for the year and month, otherwise an exception will be thrown.
 302      * The second and nanosecond fields will be set to zero.
 303      *
 304      * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
 305      * @param month  the month-of-year to represent, from 1 (January) to 12 (December)
 306      * @param dayOfMonth  the day-of-month to represent, from 1 to 31
 307      * @param hour  the hour-of-day to represent, from 0 to 23
 308      * @param minute  the minute-of-hour to represent, from 0 to 59
 309      * @return the local date-time, not null
 310      * @throws DateTimeException if the value of any field is out of range,
 311      *  or if the day-of-month is invalid for the month-year
 312      */
 313     public static LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute) {
 314         LocalDate date = LocalDate.of(year, month, dayOfMonth);
 315         LocalTime time = LocalTime.of(hour, minute);
 316         return new LocalDateTime(date, time);
 317     }
 318 
 319     /**
 320      * Obtains an instance of {@code LocalDateTime} from year, month,
 321      * day, hour, minute and second, setting the nanosecond to zero.
 322      * <p>
 323      * This returns a {@code LocalDateTime} with the specified year, month,
 324      * day-of-month, hour, minute and second.
 325      * The day must be valid for the year and month, otherwise an exception will be thrown.
 326      * The nanosecond field will be set to zero.
 327      *
 328      * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
 329      * @param month  the month-of-year to represent, from 1 (January) to 12 (December)
 330      * @param dayOfMonth  the day-of-month to represent, from 1 to 31
 331      * @param hour  the hour-of-day to represent, from 0 to 23
 332      * @param minute  the minute-of-hour to represent, from 0 to 59
 333      * @param second  the second-of-minute to represent, from 0 to 59
 334      * @return the local date-time, not null
 335      * @throws DateTimeException if the value of any field is out of range,
 336      *  or if the day-of-month is invalid for the month-year
 337      */
 338     public static LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute, int second) {
 339         LocalDate date = LocalDate.of(year, month, dayOfMonth);
 340         LocalTime time = LocalTime.of(hour, minute, second);
 341         return new LocalDateTime(date, time);
 342     }
 343 
 344     /**
 345      * Obtains an instance of {@code LocalDateTime} from year, month,
 346      * day, hour, minute, second and nanosecond.
 347      * <p>
 348      * This returns a {@code LocalDateTime} with the specified year, month,
 349      * day-of-month, hour, minute, second and nanosecond.
 350      * The day must be valid for the year and month, otherwise an exception will be thrown.
 351      *
 352      * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
 353      * @param month  the month-of-year to represent, from 1 (January) to 12 (December)
 354      * @param dayOfMonth  the day-of-month to represent, from 1 to 31
 355      * @param hour  the hour-of-day to represent, from 0 to 23
 356      * @param minute  the minute-of-hour to represent, from 0 to 59
 357      * @param second  the second-of-minute to represent, from 0 to 59
 358      * @param nanoOfSecond  the nano-of-second to represent, from 0 to 999,999,999
 359      * @return the local date-time, not null
 360      * @throws DateTimeException if the value of any field is out of range,
 361      *  or if the day-of-month is invalid for the month-year
 362      */
 363     public static LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond) {
 364         LocalDate date = LocalDate.of(year, month, dayOfMonth);
 365         LocalTime time = LocalTime.of(hour, minute, second, nanoOfSecond);
 366         return new LocalDateTime(date, time);
 367     }
 368 
 369     /**
 370      * Obtains an instance of {@code LocalDateTime} from a date and time.
 371      *
 372      * @param date  the local date, not null
 373      * @param time  the local time, not null
 374      * @return the local date-time, not null
 375      */
 376     public static LocalDateTime of(LocalDate date, LocalTime time) {
 377         Objects.requireNonNull(date, "date");
 378         Objects.requireNonNull(time, "time");
 379         return new LocalDateTime(date, time);
 380     }
 381 
 382     //-------------------------------------------------------------------------
 383     /**
 384      * Obtains an instance of {@code LocalDateTime} from an {@code Instant} and zone ID.
 385      * <p>
 386      * This creates a local date-time based on the specified instant.
 387      * First, the offset from UTC/Greenwich is obtained using the zone ID and instant,
 388      * which is simple as there is only one valid offset for each instant.
 389      * Then, the instant and offset are used to calculate the local date-time.
 390      *
 391      * @param instant  the instant to create the date-time from, not null
 392      * @param zone  the time-zone, which may be an offset, not null
 393      * @return the local date-time, not null
 394      * @throws DateTimeException if the result exceeds the supported range
 395      */
 396     public static LocalDateTime ofInstant(Instant instant, ZoneId zone) {
 397         Objects.requireNonNull(instant, "instant");
 398         Objects.requireNonNull(zone, "zone");
 399         ZoneRules rules = zone.getRules();
 400         ZoneOffset offset = rules.getOffset(instant);
 401         return ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset);
 402     }
 403 
 404     /**
 405      * Obtains an instance of {@code LocalDateTime} using seconds from the
 406      * epoch of 1970-01-01T00:00:00Z.
 407      * <p>
 408      * This allows the {@link ChronoField#INSTANT_SECONDS epoch-second} field
 409      * to be converted to a local date-time. This is primarily intended for
 410      * low-level conversions rather than general application usage.
 411      *
 412      * @param epochSecond  the number of seconds from the epoch of 1970-01-01T00:00:00Z
 413      * @param nanoOfSecond  the nanosecond within the second, from 0 to 999,999,999
 414      * @param offset  the zone offset, not null
 415      * @return the local date-time, not null
 416      * @throws DateTimeException if the result exceeds the supported range,
 417      *  or if the nano-of-second is invalid
 418      */
 419     public static LocalDateTime ofEpochSecond(long epochSecond, int nanoOfSecond, ZoneOffset offset) {
 420         Objects.requireNonNull(offset, "offset");
 421         NANO_OF_SECOND.checkValidValue(nanoOfSecond);
 422         long localSecond = epochSecond + offset.getTotalSeconds();  // overflow caught later
 423         long localEpochDay = Math.floorDiv(localSecond, SECONDS_PER_DAY);
 424         int secsOfDay = Math.floorMod(localSecond, SECONDS_PER_DAY);
 425         LocalDate date = LocalDate.ofEpochDay(localEpochDay);
 426         LocalTime time = LocalTime.ofNanoOfDay(secsOfDay * NANOS_PER_SECOND + nanoOfSecond);
 427         return new LocalDateTime(date, time);
 428     }
 429 
 430     //-----------------------------------------------------------------------
 431     /**
 432      * Obtains an instance of {@code LocalDateTime} from a temporal object.
 433      * <p>
 434      * This obtains a local date-time based on the specified temporal.
 435      * A {@code TemporalAccessor} represents an arbitrary set of date and time information,
 436      * which this factory converts to an instance of {@code LocalDateTime}.
 437      * <p>
 438      * The conversion extracts and combines the {@code LocalDate} and the
 439      * {@code LocalTime} from the temporal object.
 440      * Implementations are permitted to perform optimizations such as accessing
 441      * those fields that are equivalent to the relevant objects.
 442      * <p>
 443      * This method matches the signature of the functional interface {@link TemporalQuery}
 444      * allowing it to be used as a query via method reference, {@code LocalDateTime::from}.
 445      *
 446      * @param temporal  the temporal object to convert, not null
 447      * @return the local date-time, not null
 448      * @throws DateTimeException if unable to convert to a {@code LocalDateTime}
 449      */
 450     public static LocalDateTime from(TemporalAccessor temporal) {
 451         if (temporal instanceof LocalDateTime) {
 452             return (LocalDateTime) temporal;
 453         } else if (temporal instanceof ZonedDateTime) {
 454             return ((ZonedDateTime) temporal).toLocalDateTime();
 455         } else if (temporal instanceof OffsetDateTime) {
 456             return ((OffsetDateTime) temporal).toLocalDateTime();
 457         }
 458         try {
 459             LocalDate date = LocalDate.from(temporal);
 460             LocalTime time = LocalTime.from(temporal);
 461             return new LocalDateTime(date, time);
 462         } catch (DateTimeException ex) {
 463             throw new DateTimeException("Unable to obtain LocalDateTime from TemporalAccessor: " +
 464                     temporal + " of type " + temporal.getClass().getName(), ex);
 465         }
 466     }
 467 
 468     //-----------------------------------------------------------------------
 469     /**
 470      * Obtains an instance of {@code LocalDateTime} from a text string such as {@code 2007-12-03T10:15:30}.
 471      * <p>
 472      * The string must represent a valid date-time and is parsed using
 473      * {@link java.time.format.DateTimeFormatter#ISO_LOCAL_DATE_TIME}.
 474      *
 475      * @param text  the text to parse such as "2007-12-03T10:15:30", not null
 476      * @return the parsed local date-time, not null
 477      * @throws DateTimeParseException if the text cannot be parsed
 478      */
 479     public static LocalDateTime parse(CharSequence text) {
 480         return parse(text, DateTimeFormatter.ISO_LOCAL_DATE_TIME);
 481     }
 482 
 483     /**
 484      * Obtains an instance of {@code LocalDateTime} from a text string using a specific formatter.
 485      * <p>
 486      * The text is parsed using the formatter, returning a date-time.
 487      *
 488      * @param text  the text to parse, not null
 489      * @param formatter  the formatter to use, not null
 490      * @return the parsed local date-time, not null
 491      * @throws DateTimeParseException if the text cannot be parsed
 492      */
 493     public static LocalDateTime parse(CharSequence text, DateTimeFormatter formatter) {
 494         Objects.requireNonNull(formatter, "formatter");
 495         return formatter.parse(text, LocalDateTime::from);
 496     }
 497 
 498     //-----------------------------------------------------------------------
 499     /**
 500      * Constructor.
 501      *
 502      * @param date  the date part of the date-time, validated not null
 503      * @param time  the time part of the date-time, validated not null
 504      */
 505     private LocalDateTime(LocalDate date, LocalTime time) {
 506         this.date = date;
 507         this.time = time;
 508     }
 509 
 510     /**
 511      * Returns a copy of this date-time with the new date and time, checking
 512      * to see if a new object is in fact required.
 513      *
 514      * @param newDate  the date of the new date-time, not null
 515      * @param newTime  the time of the new date-time, not null
 516      * @return the date-time, not null
 517      */
 518     private LocalDateTime with(LocalDate newDate, LocalTime newTime) {
 519         if (date == newDate && time == newTime) {
 520             return this;
 521         }
 522         return new LocalDateTime(newDate, newTime);
 523     }
 524 
 525     //-----------------------------------------------------------------------
 526     /**
 527      * Checks if the specified field is supported.
 528      * <p>
 529      * This checks if this date-time can be queried for the specified field.
 530      * If false, then calling the {@link #range(TemporalField) range},
 531      * {@link #get(TemporalField) get} and {@link #with(TemporalField, long)}
 532      * methods will throw an exception.
 533      * <p>
 534      * If the field is a {@link ChronoField} then the query is implemented here.
 535      * The supported fields are:
 536      * <ul>
 537      * <li>{@code NANO_OF_SECOND}
 538      * <li>{@code NANO_OF_DAY}
 539      * <li>{@code MICRO_OF_SECOND}
 540      * <li>{@code MICRO_OF_DAY}
 541      * <li>{@code MILLI_OF_SECOND}
 542      * <li>{@code MILLI_OF_DAY}
 543      * <li>{@code SECOND_OF_MINUTE}
 544      * <li>{@code SECOND_OF_DAY}
 545      * <li>{@code MINUTE_OF_HOUR}
 546      * <li>{@code MINUTE_OF_DAY}
 547      * <li>{@code HOUR_OF_AMPM}
 548      * <li>{@code CLOCK_HOUR_OF_AMPM}
 549      * <li>{@code HOUR_OF_DAY}
 550      * <li>{@code CLOCK_HOUR_OF_DAY}
 551      * <li>{@code AMPM_OF_DAY}
 552      * <li>{@code DAY_OF_WEEK}
 553      * <li>{@code ALIGNED_DAY_OF_WEEK_IN_MONTH}
 554      * <li>{@code ALIGNED_DAY_OF_WEEK_IN_YEAR}
 555      * <li>{@code DAY_OF_MONTH}
 556      * <li>{@code DAY_OF_YEAR}
 557      * <li>{@code EPOCH_DAY}
 558      * <li>{@code ALIGNED_WEEK_OF_MONTH}
 559      * <li>{@code ALIGNED_WEEK_OF_YEAR}
 560      * <li>{@code MONTH_OF_YEAR}
 561      * <li>{@code PROLEPTIC_MONTH}
 562      * <li>{@code YEAR_OF_ERA}
 563      * <li>{@code YEAR}
 564      * <li>{@code ERA}
 565      * </ul>
 566      * All other {@code ChronoField} instances will return false.
 567      * <p>
 568      * If the field is not a {@code ChronoField}, then the result of this method
 569      * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}
 570      * passing {@code this} as the argument.
 571      * Whether the field is supported is determined by the field.
 572      *
 573      * @param field  the field to check, null returns false
 574      * @return true if the field is supported on this date-time, false if not
 575      */
 576     @Override
 577     public boolean isSupported(TemporalField field) {
 578         if (field instanceof ChronoField chronoField) {
 579             return chronoField.isDateBased() || chronoField.isTimeBased();
 580         }
 581         return field != null && field.isSupportedBy(this);
 582     }
 583 
 584     /**
 585      * Checks if the specified unit is supported.
 586      * <p>
 587      * This checks if the specified unit can be added to, or subtracted from, this date-time.
 588      * If false, then calling the {@link #plus(long, TemporalUnit)} and
 589      * {@link #minus(long, TemporalUnit) minus} methods will throw an exception.
 590      * <p>
 591      * If the unit is a {@link ChronoUnit} then the query is implemented here.
 592      * The supported units are:
 593      * <ul>
 594      * <li>{@code NANOS}
 595      * <li>{@code MICROS}
 596      * <li>{@code MILLIS}
 597      * <li>{@code SECONDS}
 598      * <li>{@code MINUTES}
 599      * <li>{@code HOURS}
 600      * <li>{@code HALF_DAYS}
 601      * <li>{@code DAYS}
 602      * <li>{@code WEEKS}
 603      * <li>{@code MONTHS}
 604      * <li>{@code YEARS}
 605      * <li>{@code DECADES}
 606      * <li>{@code CENTURIES}
 607      * <li>{@code MILLENNIA}
 608      * <li>{@code ERAS}
 609      * </ul>
 610      * All other {@code ChronoUnit} instances will return false.
 611      * <p>
 612      * If the unit is not a {@code ChronoUnit}, then the result of this method
 613      * is obtained by invoking {@code TemporalUnit.isSupportedBy(Temporal)}
 614      * passing {@code this} as the argument.
 615      * Whether the unit is supported is determined by the unit.
 616      *
 617      * @param unit  the unit to check, null returns false
 618      * @return true if the unit can be added/subtracted, false if not
 619      */
 620     @Override  // override for Javadoc
 621     public boolean isSupported(TemporalUnit unit) {
 622         return ChronoLocalDateTime.super.isSupported(unit);
 623     }
 624 
 625     //-----------------------------------------------------------------------
 626     /**
 627      * Gets the range of valid values for the specified field.
 628      * <p>
 629      * The range object expresses the minimum and maximum valid values for a field.
 630      * This date-time is used to enhance the accuracy of the returned range.
 631      * If it is not possible to return the range, because the field is not supported
 632      * or for some other reason, an exception is thrown.
 633      * <p>
 634      * If the field is a {@link ChronoField} then the query is implemented here.
 635      * The {@link #isSupported(TemporalField) supported fields} will return
 636      * appropriate range instances.
 637      * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
 638      * <p>
 639      * If the field is not a {@code ChronoField}, then the result of this method
 640      * is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)}
 641      * passing {@code this} as the argument.
 642      * Whether the range can be obtained is determined by the field.
 643      *
 644      * @param field  the field to query the range for, not null
 645      * @return the range of valid values for the field, not null
 646      * @throws DateTimeException if the range for the field cannot be obtained
 647      * @throws UnsupportedTemporalTypeException if the field is not supported
 648      */
 649     @Override
 650     public ValueRange range(TemporalField field) {
 651         if (field instanceof ChronoField chronoField) {
 652             return (chronoField.isTimeBased() ? time.range(field) : date.range(field));
 653         }
 654         return field.rangeRefinedBy(this);
 655     }
 656 
 657     /**
 658      * Gets the value of the specified field from this date-time as an {@code int}.
 659      * <p>
 660      * This queries this date-time for the value of the specified field.
 661      * The returned value will always be within the valid range of values for the field.
 662      * If it is not possible to return the value, because the field is not supported
 663      * or for some other reason, an exception is thrown.
 664      * <p>
 665      * If the field is a {@link ChronoField} then the query is implemented here.
 666      * The {@link #isSupported(TemporalField) supported fields} will return valid
 667      * values based on this date-time, except {@code NANO_OF_DAY}, {@code MICRO_OF_DAY},
 668      * {@code EPOCH_DAY} and {@code PROLEPTIC_MONTH} which are too large to fit in
 669      * an {@code int} and throw an {@code UnsupportedTemporalTypeException}.
 670      * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
 671      * <p>
 672      * If the field is not a {@code ChronoField}, then the result of this method
 673      * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
 674      * passing {@code this} as the argument. Whether the value can be obtained,
 675      * and what the value represents, is determined by the field.
 676      *
 677      * @param field  the field to get, not null
 678      * @return the value for the field
 679      * @throws DateTimeException if a value for the field cannot be obtained or
 680      *         the value is outside the range of valid values for the field
 681      * @throws UnsupportedTemporalTypeException if the field is not supported or
 682      *         the range of values exceeds an {@code int}
 683      * @throws ArithmeticException if numeric overflow occurs
 684      */
 685     @Override
 686     public int get(TemporalField field) {
 687         if (field instanceof ChronoField chronoField) {
 688             return (chronoField.isTimeBased() ? time.get(field) : date.get(field));
 689         }
 690         return ChronoLocalDateTime.super.get(field);
 691     }
 692 
 693     /**
 694      * Gets the value of the specified field from this date-time as a {@code long}.
 695      * <p>
 696      * This queries this date-time for the value of the specified field.
 697      * If it is not possible to return the value, because the field is not supported
 698      * or for some other reason, an exception is thrown.
 699      * <p>
 700      * If the field is a {@link ChronoField} then the query is implemented here.
 701      * The {@link #isSupported(TemporalField) supported fields} will return valid
 702      * values based on this date-time.
 703      * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
 704      * <p>
 705      * If the field is not a {@code ChronoField}, then the result of this method
 706      * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
 707      * passing {@code this} as the argument. Whether the value can be obtained,
 708      * and what the value represents, is determined by the field.
 709      *
 710      * @param field  the field to get, not null
 711      * @return the value for the field
 712      * @throws DateTimeException if a value for the field cannot be obtained
 713      * @throws UnsupportedTemporalTypeException if the field is not supported
 714      * @throws ArithmeticException if numeric overflow occurs
 715      */
 716     @Override
 717     public long getLong(TemporalField field) {
 718         if (field instanceof ChronoField chronoField) {
 719             return (chronoField.isTimeBased() ? time.getLong(field) : date.getLong(field));
 720         }
 721         return field.getFrom(this);
 722     }
 723 
 724     //-----------------------------------------------------------------------
 725     /**
 726      * Gets the {@code LocalDate} part of this date-time.
 727      * <p>
 728      * This returns a {@code LocalDate} with the same year, month and day
 729      * as this date-time.
 730      *
 731      * @return the date part of this date-time, not null
 732      */
 733     @Override
 734     public LocalDate toLocalDate() {
 735         return date;
 736     }
 737 
 738     /**
 739      * Gets the year field.
 740      * <p>
 741      * This method returns the primitive {@code int} value for the year.
 742      * <p>
 743      * The year returned by this method is proleptic as per {@code get(YEAR)}.
 744      * To obtain the year-of-era, use {@code get(YEAR_OF_ERA)}.
 745      *
 746      * @return the year, from MIN_YEAR to MAX_YEAR
 747      */
 748     public int getYear() {
 749         return date.getYear();
 750     }
 751 
 752     /**
 753      * Gets the month-of-year field from 1 to 12.
 754      * <p>
 755      * This method returns the month as an {@code int} from 1 to 12.
 756      * Application code is frequently clearer if the enum {@link Month}
 757      * is used by calling {@link #getMonth()}.
 758      *
 759      * @return the month-of-year, from 1 to 12
 760      * @see #getMonth()
 761      */
 762     public int getMonthValue() {
 763         return date.getMonthValue();
 764     }
 765 
 766     /**
 767      * Gets the month-of-year field using the {@code Month} enum.
 768      * <p>
 769      * This method returns the enum {@link Month} for the month.
 770      * This avoids confusion as to what {@code int} values mean.
 771      * If you need access to the primitive {@code int} value then the enum
 772      * provides the {@link Month#getValue() int value}.
 773      *
 774      * @return the month-of-year, not null
 775      * @see #getMonthValue()
 776      */
 777     public Month getMonth() {
 778         return date.getMonth();
 779     }
 780 
 781     /**
 782      * Gets the day-of-month field.
 783      * <p>
 784      * This method returns the primitive {@code int} value for the day-of-month.
 785      *
 786      * @return the day-of-month, from 1 to 31
 787      */
 788     public int getDayOfMonth() {
 789         return date.getDayOfMonth();
 790     }
 791 
 792     /**
 793      * Gets the day-of-year field.
 794      * <p>
 795      * This method returns the primitive {@code int} value for the day-of-year.
 796      *
 797      * @return the day-of-year, from 1 to 365, or 366 in a leap year
 798      */
 799     public int getDayOfYear() {
 800         return date.getDayOfYear();
 801     }
 802 
 803     /**
 804      * Gets the day-of-week field, which is an enum {@code DayOfWeek}.
 805      * <p>
 806      * This method returns the enum {@link DayOfWeek} for the day-of-week.
 807      * This avoids confusion as to what {@code int} values mean.
 808      * If you need access to the primitive {@code int} value then the enum
 809      * provides the {@link DayOfWeek#getValue() int value}.
 810      * <p>
 811      * Additional information can be obtained from the {@code DayOfWeek}.
 812      * This includes textual names of the values.
 813      *
 814      * @return the day-of-week, not null
 815      */
 816     public DayOfWeek getDayOfWeek() {
 817         return date.getDayOfWeek();
 818     }
 819 
 820     //-----------------------------------------------------------------------
 821     /**
 822      * Gets the {@code LocalTime} part of this date-time.
 823      * <p>
 824      * This returns a {@code LocalTime} with the same hour, minute, second and
 825      * nanosecond as this date-time.
 826      *
 827      * @return the time part of this date-time, not null
 828      */
 829     @Override
 830     public LocalTime toLocalTime() {
 831         return time;
 832     }
 833 
 834     /**
 835      * Gets the hour-of-day field.
 836      *
 837      * @return the hour-of-day, from 0 to 23
 838      */
 839     public int getHour() {
 840         return time.getHour();
 841     }
 842 
 843     /**
 844      * Gets the minute-of-hour field.
 845      *
 846      * @return the minute-of-hour, from 0 to 59
 847      */
 848     public int getMinute() {
 849         return time.getMinute();
 850     }
 851 
 852     /**
 853      * Gets the second-of-minute field.
 854      *
 855      * @return the second-of-minute, from 0 to 59
 856      */
 857     public int getSecond() {
 858         return time.getSecond();
 859     }
 860 
 861     /**
 862      * Gets the nano-of-second field.
 863      *
 864      * @return the nano-of-second, from 0 to 999,999,999
 865      */
 866     public int getNano() {
 867         return time.getNano();
 868     }
 869 
 870     //-----------------------------------------------------------------------
 871     /**
 872      * Returns an adjusted copy of this date-time.
 873      * <p>
 874      * This returns a {@code LocalDateTime}, based on this one, with the date-time adjusted.
 875      * The adjustment takes place using the specified adjuster strategy object.
 876      * Read the documentation of the adjuster to understand what adjustment will be made.
 877      * <p>
 878      * A simple adjuster might simply set the one of the fields, such as the year field.
 879      * A more complex adjuster might set the date to the last day of the month.
 880      * <p>
 881      * A selection of common adjustments is provided in
 882      * {@link java.time.temporal.TemporalAdjusters TemporalAdjusters}.
 883      * These include finding the "last day of the month" and "next Wednesday".
 884      * Key date-time classes also implement the {@code TemporalAdjuster} interface,
 885      * such as {@link Month} and {@link java.time.MonthDay MonthDay}.
 886      * The adjuster is responsible for handling special cases, such as the varying
 887      * lengths of month and leap years.
 888      * <p>
 889      * For example this code returns a date on the last day of July:
 890      * <pre>
 891      *  import static java.time.Month.*;
 892      *  import static java.time.temporal.TemporalAdjusters.*;
 893      *
 894      *  result = localDateTime.with(JULY).with(lastDayOfMonth());
 895      * </pre>
 896      * <p>
 897      * The classes {@link LocalDate} and {@link LocalTime} implement {@code TemporalAdjuster},
 898      * thus this method can be used to change the date, time or offset:
 899      * <pre>
 900      *  result = localDateTime.with(date);
 901      *  result = localDateTime.with(time);
 902      * </pre>
 903      * <p>
 904      * The result of this method is obtained by invoking the
 905      * {@link TemporalAdjuster#adjustInto(Temporal)} method on the
 906      * specified adjuster passing {@code this} as the argument.
 907      * <p>
 908      * This instance is immutable and unaffected by this method call.
 909      *
 910      * @param adjuster the adjuster to use, not null
 911      * @return a {@code LocalDateTime} based on {@code this} with the adjustment made, not null
 912      * @throws DateTimeException if the adjustment cannot be made
 913      * @throws ArithmeticException if numeric overflow occurs
 914      */
 915     @Override
 916     public LocalDateTime with(TemporalAdjuster adjuster) {
 917         // optimizations
 918         if (adjuster instanceof LocalDate) {
 919             return with((LocalDate) adjuster, time);
 920         } else if (adjuster instanceof LocalTime) {
 921             return with(date, (LocalTime) adjuster);
 922         } else if (adjuster instanceof LocalDateTime) {
 923             return (LocalDateTime) adjuster;
 924         }
 925         return (LocalDateTime) adjuster.adjustInto(this);
 926     }
 927 
 928     /**
 929      * Returns a copy of this date-time with the specified field set to a new value.
 930      * <p>
 931      * This returns a {@code LocalDateTime}, based on this one, with the value
 932      * for the specified field changed.
 933      * This can be used to change any supported field, such as the year, month or day-of-month.
 934      * If it is not possible to set the value, because the field is not supported or for
 935      * some other reason, an exception is thrown.
 936      * <p>
 937      * In some cases, changing the specified field can cause the resulting date-time to become invalid,
 938      * such as changing the month from 31st January to February would make the day-of-month invalid.
 939      * In cases like this, the field is responsible for resolving the date. Typically it will choose
 940      * the previous valid date, which would be the last valid day of February in this example.
 941      * <p>
 942      * If the field is a {@link ChronoField} then the adjustment is implemented here.
 943      * The {@link #isSupported(TemporalField) supported fields} will behave as per
 944      * the matching method on {@link LocalDate#with(TemporalField, long) LocalDate}
 945      * or {@link LocalTime#with(TemporalField, long) LocalTime}.
 946      * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
 947      * <p>
 948      * If the field is not a {@code ChronoField}, then the result of this method
 949      * is obtained by invoking {@code TemporalField.adjustInto(Temporal, long)}
 950      * passing {@code this} as the argument. In this case, the field determines
 951      * whether and how to adjust the instant.
 952      * <p>
 953      * This instance is immutable and unaffected by this method call.
 954      *
 955      * @param field  the field to set in the result, not null
 956      * @param newValue  the new value of the field in the result
 957      * @return a {@code LocalDateTime} based on {@code this} with the specified field set, not null
 958      * @throws DateTimeException if the field cannot be set
 959      * @throws UnsupportedTemporalTypeException if the field is not supported
 960      * @throws ArithmeticException if numeric overflow occurs
 961      */
 962     @Override
 963     public LocalDateTime with(TemporalField field, long newValue) {
 964         if (field instanceof ChronoField chronoField) {
 965             if (chronoField.isTimeBased()) {
 966                 return with(date, time.with(field, newValue));
 967             } else {
 968                 return with(date.with(field, newValue), time);
 969             }
 970         }
 971         return field.adjustInto(this, newValue);
 972     }
 973 
 974     //-----------------------------------------------------------------------
 975     /**
 976      * Returns a copy of this {@code LocalDateTime} with the year altered.
 977      * <p>
 978      * The time does not affect the calculation and will be the same in the result.
 979      * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
 980      * <p>
 981      * This instance is immutable and unaffected by this method call.
 982      *
 983      * @param year  the year to set in the result, from MIN_YEAR to MAX_YEAR
 984      * @return a {@code LocalDateTime} based on this date-time with the requested year, not null
 985      * @throws DateTimeException if the year value is invalid
 986      */
 987     public LocalDateTime withYear(int year) {
 988         return with(date.withYear(year), time);
 989     }
 990 
 991     /**
 992      * Returns a copy of this {@code LocalDateTime} with the month-of-year altered.
 993      * <p>
 994      * The time does not affect the calculation and will be the same in the result.
 995      * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
 996      * <p>
 997      * This instance is immutable and unaffected by this method call.
 998      *
 999      * @param month  the month-of-year to set in the result, from 1 (January) to 12 (December)
1000      * @return a {@code LocalDateTime} based on this date-time with the requested month, not null
1001      * @throws DateTimeException if the month-of-year value is invalid
1002      */
1003     public LocalDateTime withMonth(int month) {
1004         return with(date.withMonth(month), time);
1005     }
1006 
1007     /**
1008      * Returns a copy of this {@code LocalDateTime} with the day-of-month altered.
1009      * <p>
1010      * If the resulting date-time is invalid, an exception is thrown.
1011      * The time does not affect the calculation and will be the same in the result.
1012      * <p>
1013      * This instance is immutable and unaffected by this method call.
1014      *
1015      * @param dayOfMonth  the day-of-month to set in the result, from 1 to 28-31
1016      * @return a {@code LocalDateTime} based on this date-time with the requested day, not null
1017      * @throws DateTimeException if the day-of-month value is invalid,
1018      *  or if the day-of-month is invalid for the month-year
1019      */
1020     public LocalDateTime withDayOfMonth(int dayOfMonth) {
1021         return with(date.withDayOfMonth(dayOfMonth), time);
1022     }
1023 
1024     /**
1025      * Returns a copy of this {@code LocalDateTime} with the day-of-year altered.
1026      * <p>
1027      * If the resulting date-time is invalid, an exception is thrown.
1028      * <p>
1029      * This instance is immutable and unaffected by this method call.
1030      *
1031      * @param dayOfYear  the day-of-year to set in the result, from 1 to 365-366
1032      * @return a {@code LocalDateTime} based on this date with the requested day, not null
1033      * @throws DateTimeException if the day-of-year value is invalid,
1034      *  or if the day-of-year is invalid for the year
1035      */
1036     public LocalDateTime withDayOfYear(int dayOfYear) {
1037         return with(date.withDayOfYear(dayOfYear), time);
1038     }
1039 
1040     //-----------------------------------------------------------------------
1041     /**
1042      * Returns a copy of this {@code LocalDateTime} with the hour-of-day altered.
1043      * <p>
1044      * This instance is immutable and unaffected by this method call.
1045      *
1046      * @param hour  the hour-of-day to set in the result, from 0 to 23
1047      * @return a {@code LocalDateTime} based on this date-time with the requested hour, not null
1048      * @throws DateTimeException if the hour value is invalid
1049      */
1050     public LocalDateTime withHour(int hour) {
1051         LocalTime newTime = time.withHour(hour);
1052         return with(date, newTime);
1053     }
1054 
1055     /**
1056      * Returns a copy of this {@code LocalDateTime} with the minute-of-hour altered.
1057      * <p>
1058      * This instance is immutable and unaffected by this method call.
1059      *
1060      * @param minute  the minute-of-hour to set in the result, from 0 to 59
1061      * @return a {@code LocalDateTime} based on this date-time with the requested minute, not null
1062      * @throws DateTimeException if the minute value is invalid
1063      */
1064     public LocalDateTime withMinute(int minute) {
1065         LocalTime newTime = time.withMinute(minute);
1066         return with(date, newTime);
1067     }
1068 
1069     /**
1070      * Returns a copy of this {@code LocalDateTime} with the second-of-minute altered.
1071      * <p>
1072      * This instance is immutable and unaffected by this method call.
1073      *
1074      * @param second  the second-of-minute to set in the result, from 0 to 59
1075      * @return a {@code LocalDateTime} based on this date-time with the requested second, not null
1076      * @throws DateTimeException if the second value is invalid
1077      */
1078     public LocalDateTime withSecond(int second) {
1079         LocalTime newTime = time.withSecond(second);
1080         return with(date, newTime);
1081     }
1082 
1083     /**
1084      * Returns a copy of this {@code LocalDateTime} with the nano-of-second altered.
1085      * <p>
1086      * This instance is immutable and unaffected by this method call.
1087      *
1088      * @param nanoOfSecond  the nano-of-second to set in the result, from 0 to 999,999,999
1089      * @return a {@code LocalDateTime} based on this date-time with the requested nanosecond, not null
1090      * @throws DateTimeException if the nano value is invalid
1091      */
1092     public LocalDateTime withNano(int nanoOfSecond) {
1093         LocalTime newTime = time.withNano(nanoOfSecond);
1094         return with(date, newTime);
1095     }
1096 
1097     //-----------------------------------------------------------------------
1098     /**
1099      * Returns a copy of this {@code LocalDateTime} with the time truncated.
1100      * <p>
1101      * Truncation returns a copy of the original date-time with fields
1102      * smaller than the specified unit set to zero.
1103      * For example, truncating with the {@link ChronoUnit#MINUTES minutes} unit
1104      * will set the second-of-minute and nano-of-second field to zero.
1105      * <p>
1106      * The unit must have a {@linkplain TemporalUnit#getDuration() duration}
1107      * that divides into the length of a standard day without remainder.
1108      * This includes all supplied time units on {@link ChronoUnit} and
1109      * {@link ChronoUnit#DAYS DAYS}. Other units throw an exception.
1110      * <p>
1111      * This instance is immutable and unaffected by this method call.
1112      *
1113      * @param unit  the unit to truncate to, not null
1114      * @return a {@code LocalDateTime} based on this date-time with the time truncated, not null
1115      * @throws DateTimeException if unable to truncate
1116      * @throws UnsupportedTemporalTypeException if the unit is not supported
1117      */
1118     public LocalDateTime truncatedTo(TemporalUnit unit) {
1119         return with(date, time.truncatedTo(unit));
1120     }
1121 
1122     //-----------------------------------------------------------------------
1123     /**
1124      * Returns a copy of this date-time with the specified amount added.
1125      * <p>
1126      * This returns a {@code LocalDateTime}, based on this one, with the specified amount added.
1127      * The amount is typically {@link Period} or {@link Duration} but may be
1128      * any other type implementing the {@link TemporalAmount} interface.
1129      * <p>
1130      * The calculation is delegated to the amount object by calling
1131      * {@link TemporalAmount#addTo(Temporal)}. The amount implementation is free
1132      * to implement the addition in any way it wishes, however it typically
1133      * calls back to {@link #plus(long, TemporalUnit)}. Consult the documentation
1134      * of the amount implementation to determine if it can be successfully added.
1135      * <p>
1136      * This instance is immutable and unaffected by this method call.
1137      *
1138      * @param amountToAdd  the amount to add, not null
1139      * @return a {@code LocalDateTime} based on this date-time with the addition made, not null
1140      * @throws DateTimeException if the addition cannot be made
1141      * @throws ArithmeticException if numeric overflow occurs
1142      */
1143     @Override
1144     public LocalDateTime plus(TemporalAmount amountToAdd) {
1145         if (amountToAdd instanceof Period periodToAdd) {
1146             return with(date.plus(periodToAdd), time);
1147         }
1148         Objects.requireNonNull(amountToAdd, "amountToAdd");
1149         return (LocalDateTime) amountToAdd.addTo(this);
1150     }
1151 
1152     /**
1153      * Returns a copy of this date-time with the specified amount added.
1154      * <p>
1155      * This returns a {@code LocalDateTime}, based on this one, with the amount
1156      * in terms of the unit added. If it is not possible to add the amount, because the
1157      * unit is not supported or for some other reason, an exception is thrown.
1158      * <p>
1159      * If the field is a {@link ChronoUnit} then the addition is implemented here.
1160      * Date units are added as per {@link LocalDate#plus(long, TemporalUnit)}.
1161      * Time units are added as per {@link LocalTime#plus(long, TemporalUnit)} with
1162      * any overflow in days added equivalent to using {@link #plusDays(long)}.
1163      * <p>
1164      * If the field is not a {@code ChronoUnit}, then the result of this method
1165      * is obtained by invoking {@code TemporalUnit.addTo(Temporal, long)}
1166      * passing {@code this} as the argument. In this case, the unit determines
1167      * whether and how to perform the addition.
1168      * <p>
1169      * This instance is immutable and unaffected by this method call.
1170      *
1171      * @param amountToAdd  the amount of the unit to add to the result, may be negative
1172      * @param unit  the unit of the amount to add, not null
1173      * @return a {@code LocalDateTime} based on this date-time with the specified amount added, not null
1174      * @throws DateTimeException if the addition cannot be made
1175      * @throws UnsupportedTemporalTypeException if the unit is not supported
1176      * @throws ArithmeticException if numeric overflow occurs
1177      */
1178     @Override
1179     public LocalDateTime plus(long amountToAdd, TemporalUnit unit) {
1180         if (unit instanceof ChronoUnit chronoUnit) {
1181             return switch (chronoUnit) {
1182                 case NANOS     -> plusNanos(amountToAdd);
1183                 case MICROS    -> plusDays(amountToAdd / MICROS_PER_DAY).plusNanos((amountToAdd % MICROS_PER_DAY) * 1000);
1184                 case MILLIS    -> plusDays(amountToAdd / MILLIS_PER_DAY).plusNanos((amountToAdd % MILLIS_PER_DAY) * 1000_000);
1185                 case SECONDS   -> plusSeconds(amountToAdd);
1186                 case MINUTES   -> plusMinutes(amountToAdd);
1187                 case HOURS     -> plusHours(amountToAdd);
1188                 case HALF_DAYS -> plusDays(amountToAdd / 256).plusHours((amountToAdd % 256) * 12); // no overflow (256 is multiple of 2)
1189                 default -> with(date.plus(amountToAdd, unit), time);
1190             };
1191         }
1192         return unit.addTo(this, amountToAdd);
1193     }
1194 
1195     //-----------------------------------------------------------------------
1196     /**
1197      * Returns a copy of this {@code LocalDateTime} with the specified number of years added.
1198      * <p>
1199      * This method adds the specified amount to the years field in three steps:
1200      * <ol>
1201      * <li>Add the input years to the year field</li>
1202      * <li>Check if the resulting date would be invalid</li>
1203      * <li>Adjust the day-of-month to the last valid day if necessary</li>
1204      * </ol>
1205      * <p>
1206      * For example, 2008-02-29 (leap year) plus one year would result in the
1207      * invalid date 2009-02-29 (standard year). Instead of returning an invalid
1208      * result, the last valid day of the month, 2009-02-28, is selected instead.
1209      * <p>
1210      * This instance is immutable and unaffected by this method call.
1211      *
1212      * @param years  the years to add, may be negative
1213      * @return a {@code LocalDateTime} based on this date-time with the years added, not null
1214      * @throws DateTimeException if the result exceeds the supported date range
1215      */
1216     public LocalDateTime plusYears(long years) {
1217         LocalDate newDate = date.plusYears(years);
1218         return with(newDate, time);
1219     }
1220 
1221     /**
1222      * Returns a copy of this {@code LocalDateTime} with the specified number of months added.
1223      * <p>
1224      * This method adds the specified amount to the months field in three steps:
1225      * <ol>
1226      * <li>Add the input months to the month-of-year field</li>
1227      * <li>Check if the resulting date would be invalid</li>
1228      * <li>Adjust the day-of-month to the last valid day if necessary</li>
1229      * </ol>
1230      * <p>
1231      * For example, 2007-03-31 plus one month would result in the invalid date
1232      * 2007-04-31. Instead of returning an invalid result, the last valid day
1233      * of the month, 2007-04-30, is selected instead.
1234      * <p>
1235      * This instance is immutable and unaffected by this method call.
1236      *
1237      * @param months  the months to add, may be negative
1238      * @return a {@code LocalDateTime} based on this date-time with the months added, not null
1239      * @throws DateTimeException if the result exceeds the supported date range
1240      */
1241     public LocalDateTime plusMonths(long months) {
1242         LocalDate newDate = date.plusMonths(months);
1243         return with(newDate, time);
1244     }
1245 
1246     /**
1247      * Returns a copy of this {@code LocalDateTime} with the specified number of weeks added.
1248      * <p>
1249      * This method adds the specified amount in weeks to the days field incrementing
1250      * the month and year fields as necessary to ensure the result remains valid.
1251      * The result is only invalid if the maximum/minimum year is exceeded.
1252      * <p>
1253      * For example, 2008-12-31 plus one week would result in 2009-01-07.
1254      * <p>
1255      * This instance is immutable and unaffected by this method call.
1256      *
1257      * @param weeks  the weeks to add, may be negative
1258      * @return a {@code LocalDateTime} based on this date-time with the weeks added, not null
1259      * @throws DateTimeException if the result exceeds the supported date range
1260      */
1261     public LocalDateTime plusWeeks(long weeks) {
1262         LocalDate newDate = date.plusWeeks(weeks);
1263         return with(newDate, time);
1264     }
1265 
1266     /**
1267      * Returns a copy of this {@code LocalDateTime} with the specified number of days added.
1268      * <p>
1269      * This method adds the specified amount to the days field incrementing the
1270      * month and year fields as necessary to ensure the result remains valid.
1271      * The result is only invalid if the maximum/minimum year is exceeded.
1272      * <p>
1273      * For example, 2008-12-31 plus one day would result in 2009-01-01.
1274      * <p>
1275      * This instance is immutable and unaffected by this method call.
1276      *
1277      * @param days  the days to add, may be negative
1278      * @return a {@code LocalDateTime} based on this date-time with the days added, not null
1279      * @throws DateTimeException if the result exceeds the supported date range
1280      */
1281     public LocalDateTime plusDays(long days) {
1282         LocalDate newDate = date.plusDays(days);
1283         return with(newDate, time);
1284     }
1285 
1286     //-----------------------------------------------------------------------
1287     /**
1288      * Returns a copy of this {@code LocalDateTime} with the specified number of hours added.
1289      * <p>
1290      * This instance is immutable and unaffected by this method call.
1291      *
1292      * @param hours  the hours to add, may be negative
1293      * @return a {@code LocalDateTime} based on this date-time with the hours added, not null
1294      * @throws DateTimeException if the result exceeds the supported date range
1295      */
1296     public LocalDateTime plusHours(long hours) {
1297         return plusWithOverflow(date, hours, 0, 0, 0, 1);
1298     }
1299 
1300     /**
1301      * Returns a copy of this {@code LocalDateTime} with the specified number of minutes added.
1302      * <p>
1303      * This instance is immutable and unaffected by this method call.
1304      *
1305      * @param minutes  the minutes to add, may be negative
1306      * @return a {@code LocalDateTime} based on this date-time with the minutes added, not null
1307      * @throws DateTimeException if the result exceeds the supported date range
1308      */
1309     public LocalDateTime plusMinutes(long minutes) {
1310         return plusWithOverflow(date, 0, minutes, 0, 0, 1);
1311     }
1312 
1313     /**
1314      * Returns a copy of this {@code LocalDateTime} with the specified number of seconds added.
1315      * <p>
1316      * This instance is immutable and unaffected by this method call.
1317      *
1318      * @param seconds  the seconds to add, may be negative
1319      * @return a {@code LocalDateTime} based on this date-time with the seconds added, not null
1320      * @throws DateTimeException if the result exceeds the supported date range
1321      */
1322     public LocalDateTime plusSeconds(long seconds) {
1323         return plusWithOverflow(date, 0, 0, seconds, 0, 1);
1324     }
1325 
1326     /**
1327      * Returns a copy of this {@code LocalDateTime} with the specified number of nanoseconds added.
1328      * <p>
1329      * This instance is immutable and unaffected by this method call.
1330      *
1331      * @param nanos  the nanos to add, may be negative
1332      * @return a {@code LocalDateTime} based on this date-time with the nanoseconds added, not null
1333      * @throws DateTimeException if the result exceeds the supported date range
1334      */
1335     public LocalDateTime plusNanos(long nanos) {
1336         return plusWithOverflow(date, 0, 0, 0, nanos, 1);
1337     }
1338 
1339     //-----------------------------------------------------------------------
1340     /**
1341      * Returns a copy of this date-time with the specified amount subtracted.
1342      * <p>
1343      * This returns a {@code LocalDateTime}, based on this one, with the specified amount subtracted.
1344      * The amount is typically {@link Period} or {@link Duration} but may be
1345      * any other type implementing the {@link TemporalAmount} interface.
1346      * <p>
1347      * The calculation is delegated to the amount object by calling
1348      * {@link TemporalAmount#subtractFrom(Temporal)}. The amount implementation is free
1349      * to implement the subtraction in any way it wishes, however it typically
1350      * calls back to {@link #minus(long, TemporalUnit)}. Consult the documentation
1351      * of the amount implementation to determine if it can be successfully subtracted.
1352      * <p>
1353      * This instance is immutable and unaffected by this method call.
1354      *
1355      * @param amountToSubtract  the amount to subtract, not null
1356      * @return a {@code LocalDateTime} based on this date-time with the subtraction made, not null
1357      * @throws DateTimeException if the subtraction cannot be made
1358      * @throws ArithmeticException if numeric overflow occurs
1359      */
1360     @Override
1361     public LocalDateTime minus(TemporalAmount amountToSubtract) {
1362         if (amountToSubtract instanceof Period periodToSubtract) {
1363             return with(date.minus(periodToSubtract), time);
1364         }
1365         Objects.requireNonNull(amountToSubtract, "amountToSubtract");
1366         return (LocalDateTime) amountToSubtract.subtractFrom(this);
1367     }
1368 
1369     /**
1370      * Returns a copy of this date-time with the specified amount subtracted.
1371      * <p>
1372      * This returns a {@code LocalDateTime}, based on this one, with the amount
1373      * in terms of the unit subtracted. If it is not possible to subtract the amount,
1374      * because the unit is not supported or for some other reason, an exception is thrown.
1375      * <p>
1376      * This method is equivalent to {@link #plus(long, TemporalUnit)} with the amount negated.
1377      * See that method for a full description of how addition, and thus subtraction, works.
1378      * <p>
1379      * This instance is immutable and unaffected by this method call.
1380      *
1381      * @param amountToSubtract  the amount of the unit to subtract from the result, may be negative
1382      * @param unit  the unit of the amount to subtract, not null
1383      * @return a {@code LocalDateTime} based on this date-time with the specified amount subtracted, not null
1384      * @throws DateTimeException if the subtraction cannot be made
1385      * @throws UnsupportedTemporalTypeException if the unit is not supported
1386      * @throws ArithmeticException if numeric overflow occurs
1387      */
1388     @Override
1389     public LocalDateTime minus(long amountToSubtract, TemporalUnit unit) {
1390         return (amountToSubtract == Long.MIN_VALUE ? plus(Long.MAX_VALUE, unit).plus(1, unit) : plus(-amountToSubtract, unit));
1391     }
1392 
1393     //-----------------------------------------------------------------------
1394     /**
1395      * Returns a copy of this {@code LocalDateTime} with the specified number of years subtracted.
1396      * <p>
1397      * This method subtracts the specified amount from the years field in three steps:
1398      * <ol>
1399      * <li>Subtract the input years from the year field</li>
1400      * <li>Check if the resulting date would be invalid</li>
1401      * <li>Adjust the day-of-month to the last valid day if necessary</li>
1402      * </ol>
1403      * <p>
1404      * For example, 2008-02-29 (leap year) minus one year would result in the
1405      * invalid date 2007-02-29 (standard year). Instead of returning an invalid
1406      * result, the last valid day of the month, 2007-02-28, is selected instead.
1407      * <p>
1408      * This instance is immutable and unaffected by this method call.
1409      *
1410      * @param years  the years to subtract, may be negative
1411      * @return a {@code LocalDateTime} based on this date-time with the years subtracted, not null
1412      * @throws DateTimeException if the result exceeds the supported date range
1413      */
1414     public LocalDateTime minusYears(long years) {
1415         return (years == Long.MIN_VALUE ? plusYears(Long.MAX_VALUE).plusYears(1) : plusYears(-years));
1416     }
1417 
1418     /**
1419      * Returns a copy of this {@code LocalDateTime} with the specified number of months subtracted.
1420      * <p>
1421      * This method subtracts the specified amount from the months field in three steps:
1422      * <ol>
1423      * <li>Subtract the input months from the month-of-year field</li>
1424      * <li>Check if the resulting date would be invalid</li>
1425      * <li>Adjust the day-of-month to the last valid day if necessary</li>
1426      * </ol>
1427      * <p>
1428      * For example, 2007-03-31 minus one month would result in the invalid date
1429      * 2007-02-31. Instead of returning an invalid result, the last valid day
1430      * of the month, 2007-02-28, is selected instead.
1431      * <p>
1432      * This instance is immutable and unaffected by this method call.
1433      *
1434      * @param months  the months to subtract, may be negative
1435      * @return a {@code LocalDateTime} based on this date-time with the months subtracted, not null
1436      * @throws DateTimeException if the result exceeds the supported date range
1437      */
1438     public LocalDateTime minusMonths(long months) {
1439         return (months == Long.MIN_VALUE ? plusMonths(Long.MAX_VALUE).plusMonths(1) : plusMonths(-months));
1440     }
1441 
1442     /**
1443      * Returns a copy of this {@code LocalDateTime} with the specified number of weeks subtracted.
1444      * <p>
1445      * This method subtracts the specified amount in weeks from the days field decrementing
1446      * the month and year fields as necessary to ensure the result remains valid.
1447      * The result is only invalid if the maximum/minimum year is exceeded.
1448      * <p>
1449      * For example, 2009-01-07 minus one week would result in 2008-12-31.
1450      * <p>
1451      * This instance is immutable and unaffected by this method call.
1452      *
1453      * @param weeks  the weeks to subtract, may be negative
1454      * @return a {@code LocalDateTime} based on this date-time with the weeks subtracted, not null
1455      * @throws DateTimeException if the result exceeds the supported date range
1456      */
1457     public LocalDateTime minusWeeks(long weeks) {
1458         return (weeks == Long.MIN_VALUE ? plusWeeks(Long.MAX_VALUE).plusWeeks(1) : plusWeeks(-weeks));
1459     }
1460 
1461     /**
1462      * Returns a copy of this {@code LocalDateTime} with the specified number of days subtracted.
1463      * <p>
1464      * This method subtracts the specified amount from the days field decrementing the
1465      * month and year fields as necessary to ensure the result remains valid.
1466      * The result is only invalid if the maximum/minimum year is exceeded.
1467      * <p>
1468      * For example, 2009-01-01 minus one day would result in 2008-12-31.
1469      * <p>
1470      * This instance is immutable and unaffected by this method call.
1471      *
1472      * @param days  the days to subtract, may be negative
1473      * @return a {@code LocalDateTime} based on this date-time with the days subtracted, not null
1474      * @throws DateTimeException if the result exceeds the supported date range
1475      */
1476     public LocalDateTime minusDays(long days) {
1477         return (days == Long.MIN_VALUE ? plusDays(Long.MAX_VALUE).plusDays(1) : plusDays(-days));
1478     }
1479 
1480     //-----------------------------------------------------------------------
1481     /**
1482      * Returns a copy of this {@code LocalDateTime} with the specified number of hours subtracted.
1483      * <p>
1484      * This instance is immutable and unaffected by this method call.
1485      *
1486      * @param hours  the hours to subtract, may be negative
1487      * @return a {@code LocalDateTime} based on this date-time with the hours subtracted, not null
1488      * @throws DateTimeException if the result exceeds the supported date range
1489      */
1490     public LocalDateTime minusHours(long hours) {
1491         return plusWithOverflow(date, hours, 0, 0, 0, -1);
1492    }
1493 
1494     /**
1495      * Returns a copy of this {@code LocalDateTime} with the specified number of minutes subtracted.
1496      * <p>
1497      * This instance is immutable and unaffected by this method call.
1498      *
1499      * @param minutes  the minutes to subtract, may be negative
1500      * @return a {@code LocalDateTime} based on this date-time with the minutes subtracted, not null
1501      * @throws DateTimeException if the result exceeds the supported date range
1502      */
1503     public LocalDateTime minusMinutes(long minutes) {
1504         return plusWithOverflow(date, 0, minutes, 0, 0, -1);
1505     }
1506 
1507     /**
1508      * Returns a copy of this {@code LocalDateTime} with the specified number of seconds subtracted.
1509      * <p>
1510      * This instance is immutable and unaffected by this method call.
1511      *
1512      * @param seconds  the seconds to subtract, may be negative
1513      * @return a {@code LocalDateTime} based on this date-time with the seconds subtracted, not null
1514      * @throws DateTimeException if the result exceeds the supported date range
1515      */
1516     public LocalDateTime minusSeconds(long seconds) {
1517         return plusWithOverflow(date, 0, 0, seconds, 0, -1);
1518     }
1519 
1520     /**
1521      * Returns a copy of this {@code LocalDateTime} with the specified number of nanoseconds subtracted.
1522      * <p>
1523      * This instance is immutable and unaffected by this method call.
1524      *
1525      * @param nanos  the nanos to subtract, may be negative
1526      * @return a {@code LocalDateTime} based on this date-time with the nanoseconds subtracted, not null
1527      * @throws DateTimeException if the result exceeds the supported date range
1528      */
1529     public LocalDateTime minusNanos(long nanos) {
1530         return plusWithOverflow(date, 0, 0, 0, nanos, -1);
1531     }
1532 
1533     //-----------------------------------------------------------------------
1534     /**
1535      * Returns a copy of this {@code LocalDateTime} with the specified period added.
1536      * <p>
1537      * This instance is immutable and unaffected by this method call.
1538      *
1539      * @param newDate  the new date to base the calculation on, not null
1540      * @param hours  the hours to add, may be negative
1541      * @param minutes the minutes to add, may be negative
1542      * @param seconds the seconds to add, may be negative
1543      * @param nanos the nanos to add, may be negative
1544      * @param sign  the sign to determine add or subtract
1545      * @return the combined result, not null
1546      */
1547     private LocalDateTime plusWithOverflow(LocalDate newDate, long hours, long minutes, long seconds, long nanos, int sign) {
1548         // 9223372036854775808 long, 2147483648 int
1549         if ((hours | minutes | seconds | nanos) == 0) {
1550             return with(newDate, time);
1551         }
1552         long totDays = nanos / NANOS_PER_DAY +             //   max/24*60*60*1B
1553                 seconds / SECONDS_PER_DAY +                //   max/24*60*60
1554                 minutes / MINUTES_PER_DAY +                //   max/24*60
1555                 hours / HOURS_PER_DAY;                     //   max/24
1556         totDays *= sign;                                   // total max*0.4237...
1557         long totNanos = nanos % NANOS_PER_DAY +                    //   max  86400000000000
1558                 (seconds % SECONDS_PER_DAY) * NANOS_PER_SECOND +   //   max  86400000000000
1559                 (minutes % MINUTES_PER_DAY) * NANOS_PER_MINUTE +   //   max  86400000000000
1560                 (hours % HOURS_PER_DAY) * NANOS_PER_HOUR;          //   max  86400000000000
1561         long curNoD = time.toNanoOfDay();                       //   max  86400000000000
1562         totNanos = totNanos * sign + curNoD;                    // total 432000000000000
1563         totDays += Math.floorDiv(totNanos, NANOS_PER_DAY);
1564         long newNoD = Math.floorMod(totNanos, NANOS_PER_DAY);
1565         LocalTime newTime = (newNoD == curNoD ? time : LocalTime.ofNanoOfDay(newNoD));
1566         return with(newDate.plusDays(totDays), newTime);
1567     }
1568 
1569     //-----------------------------------------------------------------------
1570     /**
1571      * Queries this date-time using the specified query.
1572      * <p>
1573      * This queries this date-time using the specified query strategy object.
1574      * The {@code TemporalQuery} object defines the logic to be used to
1575      * obtain the result. Read the documentation of the query to understand
1576      * what the result of this method will be.
1577      * <p>
1578      * The result of this method is obtained by invoking the
1579      * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
1580      * specified query passing {@code this} as the argument.
1581      *
1582      * @param <R> the type of the result
1583      * @param query  the query to invoke, not null
1584      * @return the query result, null may be returned (defined by the query)
1585      * @throws DateTimeException if unable to query (defined by the query)
1586      * @throws ArithmeticException if numeric overflow occurs (defined by the query)
1587      */
1588     @SuppressWarnings("unchecked")
1589     @Override  // override for Javadoc
1590     public <R> R query(TemporalQuery<R> query) {
1591         if (query == TemporalQueries.localDate()) {
1592             return (R) date;
1593         }
1594         return ChronoLocalDateTime.super.query(query);
1595     }
1596 
1597     /**
1598      * Adjusts the specified temporal object to have the same date and time as this object.
1599      * <p>
1600      * This returns a temporal object of the same observable type as the input
1601      * with the date and time changed to be the same as this.
1602      * <p>
1603      * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)}
1604      * twice, passing {@link ChronoField#EPOCH_DAY} and
1605      * {@link ChronoField#NANO_OF_DAY} as the fields.
1606      * <p>
1607      * In most cases, it is clearer to reverse the calling pattern by using
1608      * {@link Temporal#with(TemporalAdjuster)}:
1609      * <pre>
1610      *   // these two lines are equivalent, but the second approach is recommended
1611      *   temporal = thisLocalDateTime.adjustInto(temporal);
1612      *   temporal = temporal.with(thisLocalDateTime);
1613      * </pre>
1614      * <p>
1615      * This instance is immutable and unaffected by this method call.
1616      *
1617      * @param temporal  the target object to be adjusted, not null
1618      * @return the adjusted object, not null
1619      * @throws DateTimeException if unable to make the adjustment
1620      * @throws ArithmeticException if numeric overflow occurs
1621      */
1622     @Override  // override for Javadoc
1623     public Temporal adjustInto(Temporal temporal) {
1624         return ChronoLocalDateTime.super.adjustInto(temporal);
1625     }
1626 
1627     /**
1628      * Calculates the amount of time until another date-time in terms of the specified unit.
1629      * <p>
1630      * This calculates the amount of time between two {@code LocalDateTime}
1631      * objects in terms of a single {@code TemporalUnit}.
1632      * The start and end points are {@code this} and the specified date-time.
1633      * The result will be negative if the end is before the start.
1634      * The {@code Temporal} passed to this method is converted to a
1635      * {@code LocalDateTime} using {@link #from(TemporalAccessor)}.
1636      * For example, the amount in days between two date-times can be calculated
1637      * using {@code startDateTime.until(endDateTime, DAYS)}.
1638      * <p>
1639      * The calculation returns a whole number, representing the number of
1640      * complete units between the two date-times.
1641      * For example, the amount in months between 2012-06-15T00:00 and 2012-08-14T23:59
1642      * will only be one month as it is one minute short of two months.
1643      * <p>
1644      * There are two equivalent ways of using this method.
1645      * The first is to invoke this method.
1646      * The second is to use {@link TemporalUnit#between(Temporal, Temporal)}:
1647      * <pre>
1648      *   // these two lines are equivalent
1649      *   amount = start.until(end, MONTHS);
1650      *   amount = MONTHS.between(start, end);
1651      * </pre>
1652      * The choice should be made based on which makes the code more readable.
1653      * <p>
1654      * The calculation is implemented in this method for {@link ChronoUnit}.
1655      * The units {@code NANOS}, {@code MICROS}, {@code MILLIS}, {@code SECONDS},
1656      * {@code MINUTES}, {@code HOURS} and {@code HALF_DAYS}, {@code DAYS},
1657      * {@code WEEKS}, {@code MONTHS}, {@code YEARS}, {@code DECADES},
1658      * {@code CENTURIES}, {@code MILLENNIA} and {@code ERAS} are supported.
1659      * Other {@code ChronoUnit} values will throw an exception.
1660      * <p>
1661      * If the unit is not a {@code ChronoUnit}, then the result of this method
1662      * is obtained by invoking {@code TemporalUnit.between(Temporal, Temporal)}
1663      * passing {@code this} as the first argument and the converted input temporal
1664      * as the second argument.
1665      * <p>
1666      * This instance is immutable and unaffected by this method call.
1667      *
1668      * @param endExclusive  the end date, exclusive, which is converted to a {@code LocalDateTime}, not null
1669      * @param unit  the unit to measure the amount in, not null
1670      * @return the amount of time between this date-time and the end date-time
1671      * @throws DateTimeException if the amount cannot be calculated, or the end
1672      *  temporal cannot be converted to a {@code LocalDateTime}
1673      * @throws UnsupportedTemporalTypeException if the unit is not supported
1674      * @throws ArithmeticException if numeric overflow occurs
1675      */
1676     @Override
1677     public long until(Temporal endExclusive, TemporalUnit unit) {
1678         LocalDateTime end = LocalDateTime.from(endExclusive);
1679         if (unit instanceof ChronoUnit chronoUnit) {
1680             if (unit.isTimeBased()) {
1681                 long amount = date.daysUntil(end.date);
1682                 if (amount == 0) {
1683                     return time.until(end.time, unit);
1684                 }
1685                 long timePart = end.time.toNanoOfDay() - time.toNanoOfDay();
1686                 if (amount > 0) {
1687                     amount--;  // safe
1688                     timePart += NANOS_PER_DAY;  // safe
1689                 } else {
1690                     amount++;  // safe
1691                     timePart -= NANOS_PER_DAY;  // safe
1692                 }
1693                 switch (chronoUnit) {
1694                     case NANOS:
1695                         amount = Math.multiplyExact(amount, NANOS_PER_DAY);
1696                         break;
1697                     case MICROS:
1698                         amount = Math.multiplyExact(amount, MICROS_PER_DAY);
1699                         timePart = timePart / 1000;
1700                         break;
1701                     case MILLIS:
1702                         amount = Math.multiplyExact(amount, MILLIS_PER_DAY);
1703                         timePart = timePart / 1_000_000;
1704                         break;
1705                     case SECONDS:
1706                         amount = Math.multiplyExact(amount, SECONDS_PER_DAY);
1707                         timePart = timePart / NANOS_PER_SECOND;
1708                         break;
1709                     case MINUTES:
1710                         amount = Math.multiplyExact(amount, MINUTES_PER_DAY);
1711                         timePart = timePart / NANOS_PER_MINUTE;
1712                         break;
1713                     case HOURS:
1714                         amount = Math.multiplyExact(amount, HOURS_PER_DAY);
1715                         timePart = timePart / NANOS_PER_HOUR;
1716                         break;
1717                     case HALF_DAYS:
1718                         amount = Math.multiplyExact(amount, 2);
1719                         timePart = timePart / (NANOS_PER_HOUR * 12);
1720                         break;
1721                 }
1722                 return Math.addExact(amount, timePart);
1723             }
1724             LocalDate endDate = end.date;
1725             if (endDate.isAfter(date) && end.time.isBefore(time)) {
1726                 endDate = endDate.minusDays(1);
1727             } else if (endDate.isBefore(date) && end.time.isAfter(time)) {
1728                 endDate = endDate.plusDays(1);
1729             }
1730             return date.until(endDate, unit);
1731         }
1732         return unit.between(this, end);
1733     }
1734 
1735     /**
1736      * Formats this date-time using the specified formatter.
1737      * <p>
1738      * This date-time will be passed to the formatter to produce a string.
1739      *
1740      * @param formatter  the formatter to use, not null
1741      * @return the formatted date-time string, not null
1742      * @throws DateTimeException if an error occurs during printing
1743      */
1744     @Override  // override for Javadoc and performance
1745     public String format(DateTimeFormatter formatter) {
1746         Objects.requireNonNull(formatter, "formatter");
1747         return formatter.format(this);
1748     }
1749 
1750     //-----------------------------------------------------------------------
1751     /**
1752      * Combines this date-time with an offset to create an {@code OffsetDateTime}.
1753      * <p>
1754      * This returns an {@code OffsetDateTime} formed from this date-time at the specified offset.
1755      * All possible combinations of date-time and offset are valid.
1756      *
1757      * @param offset  the offset to combine with, not null
1758      * @return the offset date-time formed from this date-time and the specified offset, not null
1759      */
1760     public OffsetDateTime atOffset(ZoneOffset offset) {
1761         return OffsetDateTime.of(this, offset);
1762     }
1763 
1764     /**
1765      * Combines this date-time with a time-zone to create a {@code ZonedDateTime}.
1766      * <p>
1767      * This returns a {@code ZonedDateTime} formed from this date-time at the
1768      * specified time-zone. The result will match this date-time as closely as possible.
1769      * Time-zone rules, such as daylight savings, mean that not every local date-time
1770      * is valid for the specified zone, thus the local date-time may be adjusted.
1771      * <p>
1772      * The local date-time is resolved to a single instant on the time-line.
1773      * This is achieved by finding a valid offset from UTC/Greenwich for the local
1774      * date-time as defined by the {@link ZoneRules rules} of the zone ID.
1775      *<p>
1776      * In most cases, there is only one valid offset for a local date-time.
1777      * In the case of an overlap, where clocks are set back, there are two valid offsets.
1778      * This method uses the earlier offset typically corresponding to "summer".
1779      * <p>
1780      * In the case of a gap, where clocks jump forward, there is no valid offset.
1781      * Instead, the local date-time is adjusted to be later by the length of the gap.
1782      * For a typical one hour daylight savings change, the local date-time will be
1783      * moved one hour later into the offset typically corresponding to "summer".
1784      * <p>
1785      * To obtain the later offset during an overlap, call
1786      * {@link ZonedDateTime#withLaterOffsetAtOverlap()} on the result of this method.
1787      * To throw an exception when there is a gap or overlap, use
1788      * {@link ZonedDateTime#ofStrict(LocalDateTime, ZoneOffset, ZoneId)}.
1789      *
1790      * @param zone  the time-zone to use, not null
1791      * @return the zoned date-time formed from this date-time, not null
1792      */
1793     @Override
1794     public ZonedDateTime atZone(ZoneId zone) {
1795         return ZonedDateTime.of(this, zone);
1796     }
1797 
1798     //-----------------------------------------------------------------------
1799     /**
1800      * Compares this date-time to another date-time.
1801      * <p>
1802      * The comparison is primarily based on the date-time, from earliest to latest.
1803      * It is "consistent with equals", as defined by {@link Comparable}.
1804      * <p>
1805      * If all the date-times being compared are instances of {@code LocalDateTime},
1806      * then the comparison will be entirely based on the date-time.
1807      * If some dates being compared are in different chronologies, then the
1808      * chronology is also considered, see {@link ChronoLocalDateTime#compareTo}.
1809      *
1810      * @param other  the other date-time to compare to, not null
1811      * @return the comparator value, that is the comparison of this local date-time with
1812      *          the {@code other} local date-time and this chronology with the {@code other} chronology,
1813      *          in order, returning the first non-zero result, and otherwise returning zero
1814      * @see #isBefore
1815      * @see #isAfter
1816      */
1817     @Override  // override for Javadoc and performance
1818     public int compareTo(ChronoLocalDateTime<?> other) {
1819         if (other instanceof LocalDateTime) {
1820             return compareTo0((LocalDateTime) other);
1821         }
1822         return ChronoLocalDateTime.super.compareTo(other);
1823     }
1824 
1825     private int compareTo0(LocalDateTime other) {
1826         int cmp = date.compareTo0(other.toLocalDate());
1827         if (cmp == 0) {
1828             cmp = time.compareTo(other.toLocalTime());
1829         }
1830         return cmp;
1831     }
1832 
1833     /**
1834      * Checks if this date-time is after the specified date-time.
1835      * <p>
1836      * This checks to see if this date-time represents a point on the
1837      * local time-line after the other date-time.
1838      * <pre>
1839      *   LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
1840      *   LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
1841      *   a.isAfter(b) == false
1842      *   a.isAfter(a) == false
1843      *   b.isAfter(a) == true
1844      * </pre>
1845      * <p>
1846      * This method only considers the position of the two date-times on the local time-line.
1847      * It does not take into account the chronology, or calendar system.
1848      * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)},
1849      * but is the same approach as {@link ChronoLocalDateTime#timeLineOrder()}.
1850      *
1851      * @param other  the other date-time to compare to, not null
1852      * @return true if this date-time is after the specified date-time
1853      */
1854     @Override  // override for Javadoc and performance
1855     public boolean isAfter(ChronoLocalDateTime<?> other) {
1856         if (other instanceof LocalDateTime) {
1857             return compareTo0((LocalDateTime) other) > 0;
1858         }
1859         return ChronoLocalDateTime.super.isAfter(other);
1860     }
1861 
1862     /**
1863      * Checks if this date-time is before the specified date-time.
1864      * <p>
1865      * This checks to see if this date-time represents a point on the
1866      * local time-line before the other date-time.
1867      * <pre>
1868      *   LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
1869      *   LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
1870      *   a.isBefore(b) == true
1871      *   a.isBefore(a) == false
1872      *   b.isBefore(a) == false
1873      * </pre>
1874      * <p>
1875      * This method only considers the position of the two date-times on the local time-line.
1876      * It does not take into account the chronology, or calendar system.
1877      * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)},
1878      * but is the same approach as {@link ChronoLocalDateTime#timeLineOrder()}.
1879      *
1880      * @param other  the other date-time to compare to, not null
1881      * @return true if this date-time is before the specified date-time
1882      */
1883     @Override  // override for Javadoc and performance
1884     public boolean isBefore(ChronoLocalDateTime<?> other) {
1885         if (other instanceof LocalDateTime) {
1886             return compareTo0((LocalDateTime) other) < 0;
1887         }
1888         return ChronoLocalDateTime.super.isBefore(other);
1889     }
1890 
1891     /**
1892      * Checks if this date-time is equal to the specified date-time.
1893      * <p>
1894      * This checks to see if this date-time represents the same point on the
1895      * local time-line as the other date-time.
1896      * <pre>
1897      *   LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
1898      *   LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
1899      *   a.isEqual(b) == false
1900      *   a.isEqual(a) == true
1901      *   b.isEqual(a) == false
1902      * </pre>
1903      * <p>
1904      * This method only considers the position of the two date-times on the local time-line.
1905      * It does not take into account the chronology, or calendar system.
1906      * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)},
1907      * but is the same approach as {@link ChronoLocalDateTime#timeLineOrder()}.
1908      *
1909      * @param other  the other date-time to compare to, not null
1910      * @return true if this date-time is equal to the specified date-time
1911      */
1912     @Override  // override for Javadoc and performance
1913     public boolean isEqual(ChronoLocalDateTime<?> other) {
1914         if (other instanceof LocalDateTime) {
1915             return compareTo0((LocalDateTime) other) == 0;
1916         }
1917         return ChronoLocalDateTime.super.isEqual(other);
1918     }
1919 
1920     //-----------------------------------------------------------------------
1921     /**
1922      * Checks if this date-time is equal to another date-time.
1923      * <p>
1924      * Compares this {@code LocalDateTime} with another ensuring that the date-time is the same.
1925      * Only objects of type {@code LocalDateTime} are compared, other types return false.
1926      *
1927      * @param obj  the object to check, null returns false
1928      * @return true if this is equal to the other date-time
1929      */
1930     @Override
1931     public boolean equals(Object obj) {
1932         if (this == obj) {
1933             return true;
1934         }
1935         return (obj instanceof LocalDateTime other)
1936                 && date.equals(other.date)
1937                 && time.equals(other.time);
1938     }
1939 
1940     /**
1941      * A hash code for this date-time.
1942      *
1943      * @return a suitable hash code
1944      */
1945     @Override
1946     public int hashCode() {
1947         return date.hashCode() ^ time.hashCode();
1948     }
1949 
1950     //-----------------------------------------------------------------------
1951     /**
1952      * Outputs this date-time as a {@code String}, such as {@code 2007-12-03T10:15:30}.
1953      * <p>
1954      * The output will be one of the following ISO-8601 formats:
1955      * <ul>
1956      * <li>{@code uuuu-MM-dd'T'HH:mm}</li>
1957      * <li>{@code uuuu-MM-dd'T'HH:mm:ss}</li>
1958      * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSS}</li>
1959      * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSS}</li>
1960      * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSSSSS}</li>
1961      * </ul>
1962      * The format used will be the shortest that outputs the full value of
1963      * the time where the omitted parts are implied to be zero.
1964      *
1965      * @return a string representation of this date-time, not null
1966      */
1967     @Override
1968     public String toString() {
1969         var buf = new StringBuilder(29);
1970         formatTo(buf);
1971         return buf.toString();
1972     }
1973 
1974     /**
1975      * Prints the toString result to the given buf, avoiding extra string allocations.
1976      */
1977     void formatTo(StringBuilder buf) {
1978         date.formatTo(buf);
1979         buf.append('T');
1980         time.formatTo(buf);
1981     }
1982 
1983     //-----------------------------------------------------------------------
1984     /**
1985      * Writes the object using a
1986      * <a href="{@docRoot}/serialized-form.html#java.time.Ser">dedicated serialized form</a>.
1987      * @serialData
1988      * <pre>
1989      *  out.writeByte(5);  // identifies a LocalDateTime
1990      *  // the <a href="{@docRoot}/serialized-form.html#java.time.LocalDate">date</a> excluding the one byte header
1991      *  // the <a href="{@docRoot}/serialized-form.html#java.time.LocalTime">time</a> excluding the one byte header
1992      * </pre>
1993      *
1994      * @return the instance of {@code Ser}, not null
1995      */
1996     @java.io.Serial
1997     private Object writeReplace() {
1998         return new Ser(Ser.LOCAL_DATE_TIME_TYPE, this);
1999     }
2000 
2001     /**
2002      * Defend against malicious streams.
2003      *
2004      * @param s the stream to read
2005      * @throws InvalidObjectException always
2006      */
2007     @java.io.Serial
2008     private void readObject(ObjectInputStream s) throws InvalidObjectException {
2009         throw new InvalidObjectException("Deserialization via serialization delegate");
2010     }
2011 
2012     void writeExternal(DataOutput out) throws IOException {
2013         date.writeExternal(out);
2014         time.writeExternal(out);
2015     }
2016 
2017     static LocalDateTime readExternal(DataInput in) throws IOException {
2018         LocalDate date = LocalDate.readExternal(in);
2019         LocalTime time = LocalTime.readExternal(in);
2020         return LocalDateTime.of(date, time);
2021     }
2022 
2023 }