1 /*
2 * Copyright (c) 2012, 2023, 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 return date.toString() + 'T' + time.toString();
1970 }
1971
1972 //-----------------------------------------------------------------------
1973 /**
1974 * Writes the object using a
1975 * <a href="{@docRoot}/serialized-form.html#java.time.Ser">dedicated serialized form</a>.
1976 * @serialData
1977 * <pre>
1978 * out.writeByte(5); // identifies a LocalDateTime
1979 * // the <a href="{@docRoot}/serialized-form.html#java.time.LocalDate">date</a> excluding the one byte header
1980 * // the <a href="{@docRoot}/serialized-form.html#java.time.LocalTime">time</a> excluding the one byte header
1981 * </pre>
1982 *
1983 * @return the instance of {@code Ser}, not null
1984 */
1985 @java.io.Serial
1986 private Object writeReplace() {
1987 return new Ser(Ser.LOCAL_DATE_TIME_TYPE, this);
1988 }
1989
1990 /**
1991 * Defend against malicious streams.
1992 *
1993 * @param s the stream to read
1994 * @throws InvalidObjectException always
1995 */
1996 @java.io.Serial
1997 private void readObject(ObjectInputStream s) throws InvalidObjectException {
1998 throw new InvalidObjectException("Deserialization via serialization delegate");
1999 }
2000
2001 void writeExternal(DataOutput out) throws IOException {
2002 date.writeExternal(out);
2003 time.writeExternal(out);
2004 }
2005
2006 static LocalDateTime readExternal(DataInput in) throws IOException {
2007 LocalDate date = LocalDate.readExternal(in);
2008 LocalTime time = LocalTime.readExternal(in);
2009 return LocalDateTime.of(date, time);
2010 }
2011
2012 }