1 /*
2 * Copyright (c) 2012, 2025, 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 {@linkplain #equals(Object) equal}
125 * as interchangeable and should not use instances for synchronization, mutexes, or
126 * with {@linkplain java.lang.ref.Reference object references}.
127 *
128 * <div class="preview-block">
129 * <div class="preview-comment">
130 * When preview features are enabled, {@code LocalDateTime} is a {@linkplain Class#isValue value class}.
131 * Use of value class instances for synchronization, mutexes, or with
132 * {@linkplain java.lang.ref.Reference object references} result in
133 * {@link IdentityException}.
134 * </div>
135 * </div>
136 *
137 * @implSpec
138 * This class is immutable and thread-safe.
139 *
140 * @since 1.8
141 */
142 @jdk.internal.ValueBased
143 @jdk.internal.MigratedValueClass
144 public final class LocalDateTime
145 implements Temporal, TemporalAdjuster, ChronoLocalDateTime<LocalDate>, Serializable {
146
147 /**
148 * The minimum supported {@code LocalDateTime}, '-999999999-01-01T00:00:00'.
149 * This is the local date-time of midnight at the start of the minimum date.
150 * This combines {@link LocalDate#MIN} and {@link LocalTime#MIN}.
151 * This could be used by an application as a "far past" date-time.
152 */
153 public static final LocalDateTime MIN = LocalDateTime.of(LocalDate.MIN, LocalTime.MIN);
154 /**
155 * The maximum supported {@code LocalDateTime}, '+999999999-12-31T23:59:59.999999999'.
156 * This is the local date-time just before midnight at the end of the maximum date.
157 * This combines {@link LocalDate#MAX} and {@link LocalTime#MAX}.
158 * This could be used by an application as a "far future" date-time.
159 */
160 public static final LocalDateTime MAX = LocalDateTime.of(LocalDate.MAX, LocalTime.MAX);
161
162 /**
163 * Serialization version.
164 */
165 @java.io.Serial
166 private static final long serialVersionUID = 6207766400415563566L;
167
168 /**
169 * @serial The date part.
170 */
171 private final LocalDate date;
172 /**
173 * @serial The time part.
174 */
175 private final LocalTime time;
176
177 //-----------------------------------------------------------------------
178 /**
179 * Obtains the current date-time from the system clock in the default time-zone.
180 * <p>
181 * This will query the {@link Clock#systemDefaultZone() system clock} in the default
182 * time-zone to obtain the current date-time.
183 * <p>
184 * Using this method will prevent the ability to use an alternate clock for testing
185 * because the clock is hard-coded.
186 *
187 * @return the current date-time using the system clock and default time-zone, not null
188 */
189 public static LocalDateTime now() {
190 return now(Clock.systemDefaultZone());
191 }
192
193 /**
194 * Obtains the current date-time from the system clock in the specified time-zone.
195 * <p>
196 * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date-time.
197 * Specifying the time-zone avoids dependence on the default time-zone.
198 * <p>
199 * Using this method will prevent the ability to use an alternate clock for testing
200 * because the clock is hard-coded.
201 *
202 * @param zone the zone ID to use, not null
203 * @return the current date-time using the system clock, not null
204 */
205 public static LocalDateTime now(ZoneId zone) {
206 return now(Clock.system(zone));
207 }
208
209 /**
210 * Obtains the current date-time from the specified clock.
211 * <p>
212 * This will query the specified clock to obtain the current date-time.
213 * Using this method allows the use of an alternate clock for testing.
214 * The alternate clock may be introduced using {@link Clock dependency injection}.
215 *
216 * @param clock the clock to use, not null
217 * @return the current date-time, not null
218 */
219 public static LocalDateTime now(Clock clock) {
220 Objects.requireNonNull(clock, "clock");
221 final Instant now = clock.instant(); // called once
222 ZoneOffset offset = clock.getZone().getRules().getOffset(now);
223 return ofEpochSecond(now.getEpochSecond(), now.getNano(), offset);
224 }
225
226 //-----------------------------------------------------------------------
227 /**
228 * Obtains an instance of {@code LocalDateTime} from year, month,
229 * day, hour and minute, setting the second and nanosecond to zero.
230 * <p>
231 * This returns a {@code LocalDateTime} with the specified year, month,
232 * day-of-month, hour and minute.
233 * The day must be valid for the year and month, otherwise an exception will be thrown.
234 * The second and nanosecond fields will be set to zero.
235 *
236 * @param year the year to represent, from MIN_YEAR to MAX_YEAR
237 * @param month the month-of-year to represent, not null
238 * @param dayOfMonth the day-of-month to represent, from 1 to 31
239 * @param hour the hour-of-day to represent, from 0 to 23
240 * @param minute the minute-of-hour to represent, from 0 to 59
241 * @return the local date-time, not null
242 * @throws DateTimeException if the value of any field is out of range,
243 * or if the day-of-month is invalid for the month-year
244 */
245 public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute) {
246 LocalDate date = LocalDate.of(year, month, dayOfMonth);
247 LocalTime time = LocalTime.of(hour, minute);
248 return new LocalDateTime(date, time);
249 }
250
251 /**
252 * Obtains an instance of {@code LocalDateTime} from year, month,
253 * day, hour, minute and second, setting the nanosecond to zero.
254 * <p>
255 * This returns a {@code LocalDateTime} with the specified year, month,
256 * day-of-month, hour, minute and second.
257 * The day must be valid for the year and month, otherwise an exception will be thrown.
258 * The nanosecond field will be set to zero.
259 *
260 * @param year the year to represent, from MIN_YEAR to MAX_YEAR
261 * @param month the month-of-year to represent, not null
262 * @param dayOfMonth the day-of-month to represent, from 1 to 31
263 * @param hour the hour-of-day to represent, from 0 to 23
264 * @param minute the minute-of-hour to represent, from 0 to 59
265 * @param second the second-of-minute to represent, from 0 to 59
266 * @return the local date-time, not null
267 * @throws DateTimeException if the value of any field is out of range,
268 * or if the day-of-month is invalid for the month-year
269 */
270 public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute, int second) {
271 LocalDate date = LocalDate.of(year, month, dayOfMonth);
272 LocalTime time = LocalTime.of(hour, minute, second);
273 return new LocalDateTime(date, time);
274 }
275
276 /**
277 * Obtains an instance of {@code LocalDateTime} from year, month,
278 * day, hour, minute, second and nanosecond.
279 * <p>
280 * This returns a {@code LocalDateTime} with the specified year, month,
281 * day-of-month, hour, minute, second and nanosecond.
282 * The day must be valid for the year and month, otherwise an exception will be thrown.
283 *
284 * @param year the year to represent, from MIN_YEAR to MAX_YEAR
285 * @param month the month-of-year to represent, not null
286 * @param dayOfMonth the day-of-month to represent, from 1 to 31
287 * @param hour the hour-of-day to represent, from 0 to 23
288 * @param minute the minute-of-hour to represent, from 0 to 59
289 * @param second the second-of-minute to represent, from 0 to 59
290 * @param nanoOfSecond the nano-of-second to represent, from 0 to 999,999,999
291 * @return the local date-time, not null
292 * @throws DateTimeException if the value of any field is out of range,
293 * or if the day-of-month is invalid for the month-year
294 */
295 public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond) {
296 LocalDate date = LocalDate.of(year, month, dayOfMonth);
297 LocalTime time = LocalTime.of(hour, minute, second, nanoOfSecond);
298 return new LocalDateTime(date, time);
299 }
300
301 //-----------------------------------------------------------------------
302 /**
303 * Obtains an instance of {@code LocalDateTime} from year, month,
304 * day, hour and minute, setting the second and nanosecond to zero.
305 * <p>
306 * This returns a {@code LocalDateTime} with the specified year, month,
307 * day-of-month, hour and minute.
308 * The day must be valid for the year and month, otherwise an exception will be thrown.
309 * The second and nanosecond fields will be set to zero.
310 *
311 * @param year the year to represent, from MIN_YEAR to MAX_YEAR
312 * @param month the month-of-year to represent, from 1 (January) to 12 (December)
313 * @param dayOfMonth the day-of-month to represent, from 1 to 31
314 * @param hour the hour-of-day to represent, from 0 to 23
315 * @param minute the minute-of-hour to represent, from 0 to 59
316 * @return the local date-time, not null
317 * @throws DateTimeException if the value of any field is out of range,
318 * or if the day-of-month is invalid for the month-year
319 */
320 public static LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute) {
321 LocalDate date = LocalDate.of(year, month, dayOfMonth);
322 LocalTime time = LocalTime.of(hour, minute);
323 return new LocalDateTime(date, time);
324 }
325
326 /**
327 * Obtains an instance of {@code LocalDateTime} from year, month,
328 * day, hour, minute and second, setting the nanosecond to zero.
329 * <p>
330 * This returns a {@code LocalDateTime} with the specified year, month,
331 * day-of-month, hour, minute and second.
332 * The day must be valid for the year and month, otherwise an exception will be thrown.
333 * The nanosecond field will be set to zero.
334 *
335 * @param year the year to represent, from MIN_YEAR to MAX_YEAR
336 * @param month the month-of-year to represent, from 1 (January) to 12 (December)
337 * @param dayOfMonth the day-of-month to represent, from 1 to 31
338 * @param hour the hour-of-day to represent, from 0 to 23
339 * @param minute the minute-of-hour to represent, from 0 to 59
340 * @param second the second-of-minute to represent, from 0 to 59
341 * @return the local date-time, not null
342 * @throws DateTimeException if the value of any field is out of range,
343 * or if the day-of-month is invalid for the month-year
344 */
345 public static LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute, int second) {
346 LocalDate date = LocalDate.of(year, month, dayOfMonth);
347 LocalTime time = LocalTime.of(hour, minute, second);
348 return new LocalDateTime(date, time);
349 }
350
351 /**
352 * Obtains an instance of {@code LocalDateTime} from year, month,
353 * day, hour, minute, second and nanosecond.
354 * <p>
355 * This returns a {@code LocalDateTime} with the specified year, month,
356 * day-of-month, hour, minute, second and nanosecond.
357 * The day must be valid for the year and month, otherwise an exception will be thrown.
358 *
359 * @param year the year to represent, from MIN_YEAR to MAX_YEAR
360 * @param month the month-of-year to represent, from 1 (January) to 12 (December)
361 * @param dayOfMonth the day-of-month to represent, from 1 to 31
362 * @param hour the hour-of-day to represent, from 0 to 23
363 * @param minute the minute-of-hour to represent, from 0 to 59
364 * @param second the second-of-minute to represent, from 0 to 59
365 * @param nanoOfSecond the nano-of-second to represent, from 0 to 999,999,999
366 * @return the local date-time, not null
367 * @throws DateTimeException if the value of any field is out of range,
368 * or if the day-of-month is invalid for the month-year
369 */
370 public static LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond) {
371 LocalDate date = LocalDate.of(year, month, dayOfMonth);
372 LocalTime time = LocalTime.of(hour, minute, second, nanoOfSecond);
373 return new LocalDateTime(date, time);
374 }
375
376 /**
377 * Obtains an instance of {@code LocalDateTime} from a date and time.
378 *
379 * @param date the local date, not null
380 * @param time the local time, not null
381 * @return the local date-time, not null
382 */
383 public static LocalDateTime of(LocalDate date, LocalTime time) {
384 Objects.requireNonNull(date, "date");
385 Objects.requireNonNull(time, "time");
386 return new LocalDateTime(date, time);
387 }
388
389 //-------------------------------------------------------------------------
390 /**
391 * Obtains an instance of {@code LocalDateTime} from an {@code Instant} and zone ID.
392 * <p>
393 * This creates a local date-time based on the specified instant.
394 * First, the offset from UTC/Greenwich is obtained using the zone ID and instant,
395 * which is simple as there is only one valid offset for each instant.
396 * Then, the instant and offset are used to calculate the local date-time.
397 *
398 * @param instant the instant to create the date-time from, not null
399 * @param zone the time-zone, which may be an offset, not null
400 * @return the local date-time, not null
401 * @throws DateTimeException if the result exceeds the supported range
402 */
403 public static LocalDateTime ofInstant(Instant instant, ZoneId zone) {
404 Objects.requireNonNull(instant, "instant");
405 Objects.requireNonNull(zone, "zone");
406 ZoneRules rules = zone.getRules();
407 ZoneOffset offset = rules.getOffset(instant);
408 return ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset);
409 }
410
411 /**
412 * Obtains an instance of {@code LocalDateTime} using seconds from the
413 * epoch of 1970-01-01T00:00:00Z.
414 * <p>
415 * This allows the {@link ChronoField#INSTANT_SECONDS epoch-second} field
416 * to be converted to a local date-time. This is primarily intended for
417 * low-level conversions rather than general application usage.
418 *
419 * @param epochSecond the number of seconds from the epoch of 1970-01-01T00:00:00Z
420 * @param nanoOfSecond the nanosecond within the second, from 0 to 999,999,999
421 * @param offset the zone offset, not null
422 * @return the local date-time, not null
423 * @throws DateTimeException if the result exceeds the supported range,
424 * or if the nano-of-second is invalid
425 */
426 public static LocalDateTime ofEpochSecond(long epochSecond, int nanoOfSecond, ZoneOffset offset) {
427 Objects.requireNonNull(offset, "offset");
428 NANO_OF_SECOND.checkValidValue(nanoOfSecond);
429 long localSecond = epochSecond + offset.getTotalSeconds(); // overflow caught later
430 long localEpochDay = Math.floorDiv(localSecond, SECONDS_PER_DAY);
431 int secsOfDay = Math.floorMod(localSecond, SECONDS_PER_DAY);
432 LocalDate date = LocalDate.ofEpochDay(localEpochDay);
433 LocalTime time = LocalTime.ofNanoOfDay(secsOfDay * NANOS_PER_SECOND + nanoOfSecond);
434 return new LocalDateTime(date, time);
435 }
436
437 //-----------------------------------------------------------------------
438 /**
439 * Obtains an instance of {@code LocalDateTime} from a temporal object.
440 * <p>
441 * This obtains a local date-time based on the specified temporal.
442 * A {@code TemporalAccessor} represents an arbitrary set of date and time information,
443 * which this factory converts to an instance of {@code LocalDateTime}.
444 * <p>
445 * The conversion extracts and combines the {@code LocalDate} and the
446 * {@code LocalTime} from the temporal object.
447 * Implementations are permitted to perform optimizations such as accessing
448 * those fields that are equivalent to the relevant objects.
449 * <p>
450 * This method matches the signature of the functional interface {@link TemporalQuery}
451 * allowing it to be used as a query via method reference, {@code LocalDateTime::from}.
452 *
453 * @param temporal the temporal object to convert, not null
454 * @return the local date-time, not null
455 * @throws DateTimeException if unable to convert to a {@code LocalDateTime}
456 */
457 public static LocalDateTime from(TemporalAccessor temporal) {
458 if (temporal instanceof LocalDateTime) {
459 return (LocalDateTime) temporal;
460 } else if (temporal instanceof ZonedDateTime) {
461 return ((ZonedDateTime) temporal).toLocalDateTime();
462 } else if (temporal instanceof OffsetDateTime) {
463 return ((OffsetDateTime) temporal).toLocalDateTime();
464 }
465 try {
466 LocalDate date = LocalDate.from(temporal);
467 LocalTime time = LocalTime.from(temporal);
468 return new LocalDateTime(date, time);
469 } catch (DateTimeException ex) {
470 throw new DateTimeException("Unable to obtain LocalDateTime from TemporalAccessor: " +
471 temporal + " of type " + temporal.getClass().getName(), ex);
472 }
473 }
474
475 //-----------------------------------------------------------------------
476 /**
477 * Obtains an instance of {@code LocalDateTime} from a text string such as {@code 2007-12-03T10:15:30}.
478 * <p>
479 * The string must represent a valid date-time and is parsed using
480 * {@link java.time.format.DateTimeFormatter#ISO_LOCAL_DATE_TIME}.
481 *
482 * @param text the text to parse such as "2007-12-03T10:15:30", not null
483 * @return the parsed local date-time, not null
484 * @throws DateTimeParseException if the text cannot be parsed
485 */
486 public static LocalDateTime parse(CharSequence text) {
487 return parse(text, DateTimeFormatter.ISO_LOCAL_DATE_TIME);
488 }
489
490 /**
491 * Obtains an instance of {@code LocalDateTime} from a text string using a specific formatter.
492 * <p>
493 * The text is parsed using the formatter, returning a date-time.
494 *
495 * @param text the text to parse, not null
496 * @param formatter the formatter to use, not null
497 * @return the parsed local date-time, not null
498 * @throws DateTimeParseException if the text cannot be parsed
499 */
500 public static LocalDateTime parse(CharSequence text, DateTimeFormatter formatter) {
501 Objects.requireNonNull(formatter, "formatter");
502 return formatter.parse(text, LocalDateTime::from);
503 }
504
505 //-----------------------------------------------------------------------
506 /**
507 * Constructor.
508 *
509 * @param date the date part of the date-time, validated not null
510 * @param time the time part of the date-time, validated not null
511 */
512 private LocalDateTime(LocalDate date, LocalTime time) {
513 this.date = date;
514 this.time = time;
515 }
516
517 /**
518 * Returns a copy of this date-time with the new date and time, checking
519 * to see if a new object is in fact required.
520 *
521 * @param newDate the date of the new date-time, not null
522 * @param newTime the time of the new date-time, not null
523 * @return the date-time, not null
524 */
525 private LocalDateTime with(LocalDate newDate, LocalTime newTime) {
526 if (date == newDate && time == newTime) {
527 return this;
528 }
529 return new LocalDateTime(newDate, newTime);
530 }
531
532 //-----------------------------------------------------------------------
533 /**
534 * Checks if the specified field is supported.
535 * <p>
536 * This checks if this date-time can be queried for the specified field.
537 * If false, then calling the {@link #range(TemporalField) range},
538 * {@link #get(TemporalField) get} and {@link #with(TemporalField, long)}
539 * methods will throw an exception.
540 * <p>
541 * If the field is a {@link ChronoField} then the query is implemented here.
542 * The supported fields are:
543 * <ul>
544 * <li>{@code NANO_OF_SECOND}
545 * <li>{@code NANO_OF_DAY}
546 * <li>{@code MICRO_OF_SECOND}
547 * <li>{@code MICRO_OF_DAY}
548 * <li>{@code MILLI_OF_SECOND}
549 * <li>{@code MILLI_OF_DAY}
550 * <li>{@code SECOND_OF_MINUTE}
551 * <li>{@code SECOND_OF_DAY}
552 * <li>{@code MINUTE_OF_HOUR}
553 * <li>{@code MINUTE_OF_DAY}
554 * <li>{@code HOUR_OF_AMPM}
555 * <li>{@code CLOCK_HOUR_OF_AMPM}
556 * <li>{@code HOUR_OF_DAY}
557 * <li>{@code CLOCK_HOUR_OF_DAY}
558 * <li>{@code AMPM_OF_DAY}
559 * <li>{@code DAY_OF_WEEK}
560 * <li>{@code ALIGNED_DAY_OF_WEEK_IN_MONTH}
561 * <li>{@code ALIGNED_DAY_OF_WEEK_IN_YEAR}
562 * <li>{@code DAY_OF_MONTH}
563 * <li>{@code DAY_OF_YEAR}
564 * <li>{@code EPOCH_DAY}
565 * <li>{@code ALIGNED_WEEK_OF_MONTH}
566 * <li>{@code ALIGNED_WEEK_OF_YEAR}
567 * <li>{@code MONTH_OF_YEAR}
568 * <li>{@code PROLEPTIC_MONTH}
569 * <li>{@code YEAR_OF_ERA}
570 * <li>{@code YEAR}
571 * <li>{@code ERA}
572 * </ul>
573 * All other {@code ChronoField} instances will return false.
574 * <p>
575 * If the field is not a {@code ChronoField}, then the result of this method
576 * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}
577 * passing {@code this} as the argument.
578 * Whether the field is supported is determined by the field.
579 *
580 * @param field the field to check, null returns false
581 * @return true if the field is supported on this date-time, false if not
582 */
583 @Override
584 public boolean isSupported(TemporalField field) {
585 if (field instanceof ChronoField chronoField) {
586 return chronoField.isDateBased() || chronoField.isTimeBased();
587 }
588 return field != null && field.isSupportedBy(this);
589 }
590
591 /**
592 * Checks if the specified unit is supported.
593 * <p>
594 * This checks if the specified unit can be added to, or subtracted from, this date-time.
595 * If false, then calling the {@link #plus(long, TemporalUnit)} and
596 * {@link #minus(long, TemporalUnit) minus} methods will throw an exception.
597 * <p>
598 * If the unit is a {@link ChronoUnit} then the query is implemented here.
599 * The supported units are:
600 * <ul>
601 * <li>{@code NANOS}
602 * <li>{@code MICROS}
603 * <li>{@code MILLIS}
604 * <li>{@code SECONDS}
605 * <li>{@code MINUTES}
606 * <li>{@code HOURS}
607 * <li>{@code HALF_DAYS}
608 * <li>{@code DAYS}
609 * <li>{@code WEEKS}
610 * <li>{@code MONTHS}
611 * <li>{@code YEARS}
612 * <li>{@code DECADES}
613 * <li>{@code CENTURIES}
614 * <li>{@code MILLENNIA}
615 * <li>{@code ERAS}
616 * </ul>
617 * All other {@code ChronoUnit} instances will return false.
618 * <p>
619 * If the unit is not a {@code ChronoUnit}, then the result of this method
620 * is obtained by invoking {@code TemporalUnit.isSupportedBy(Temporal)}
621 * passing {@code this} as the argument.
622 * Whether the unit is supported is determined by the unit.
623 *
624 * @param unit the unit to check, null returns false
625 * @return true if the unit can be added/subtracted, false if not
626 */
627 @Override // override for Javadoc
628 public boolean isSupported(TemporalUnit unit) {
629 return ChronoLocalDateTime.super.isSupported(unit);
630 }
631
632 //-----------------------------------------------------------------------
633 /**
634 * Gets the range of valid values for the specified field.
635 * <p>
636 * The range object expresses the minimum and maximum valid values for a field.
637 * This date-time is used to enhance the accuracy of the returned range.
638 * If it is not possible to return the range, because the field is not supported
639 * or for some other reason, an exception is thrown.
640 * <p>
641 * If the field is a {@link ChronoField} then the query is implemented here.
642 * The {@link #isSupported(TemporalField) supported fields} will return
643 * appropriate range instances.
644 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
645 * <p>
646 * If the field is not a {@code ChronoField}, then the result of this method
647 * is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)}
648 * passing {@code this} as the argument.
649 * Whether the range can be obtained is determined by the field.
650 *
651 * @param field the field to query the range for, not null
652 * @return the range of valid values for the field, not null
653 * @throws DateTimeException if the range for the field cannot be obtained
654 * @throws UnsupportedTemporalTypeException if the field is not supported
655 */
656 @Override
657 public ValueRange range(TemporalField field) {
658 if (field instanceof ChronoField chronoField) {
659 return (chronoField.isTimeBased() ? time.range(field) : date.range(field));
660 }
661 return field.rangeRefinedBy(this);
662 }
663
664 /**
665 * Gets the value of the specified field from this date-time as an {@code int}.
666 * <p>
667 * This queries this date-time for the value of the specified field.
668 * The returned value will always be within the valid range of values for the field.
669 * If it is not possible to return the value, because the field is not supported
670 * or for some other reason, an exception is thrown.
671 * <p>
672 * If the field is a {@link ChronoField} then the query is implemented here.
673 * The {@link #isSupported(TemporalField) supported fields} will return valid
674 * values based on this date-time, except {@code NANO_OF_DAY}, {@code MICRO_OF_DAY},
675 * {@code EPOCH_DAY} and {@code PROLEPTIC_MONTH} which are too large to fit in
676 * an {@code int} and throw an {@code UnsupportedTemporalTypeException}.
677 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
678 * <p>
679 * If the field is not a {@code ChronoField}, then the result of this method
680 * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
681 * passing {@code this} as the argument. Whether the value can be obtained,
682 * and what the value represents, is determined by the field.
683 *
684 * @param field the field to get, not null
685 * @return the value for the field
686 * @throws DateTimeException if a value for the field cannot be obtained or
687 * the value is outside the range of valid values for the field
688 * @throws UnsupportedTemporalTypeException if the field is not supported or
689 * the range of values exceeds an {@code int}
690 * @throws ArithmeticException if numeric overflow occurs
691 */
692 @Override
693 public int get(TemporalField field) {
694 if (field instanceof ChronoField chronoField) {
695 return (chronoField.isTimeBased() ? time.get(field) : date.get(field));
696 }
697 return ChronoLocalDateTime.super.get(field);
698 }
699
700 /**
701 * Gets the value of the specified field from this date-time as a {@code long}.
702 * <p>
703 * This queries this date-time for the value of the specified field.
704 * If it is not possible to return the value, because the field is not supported
705 * or for some other reason, an exception is thrown.
706 * <p>
707 * If the field is a {@link ChronoField} then the query is implemented here.
708 * The {@link #isSupported(TemporalField) supported fields} will return valid
709 * values based on this date-time.
710 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
711 * <p>
712 * If the field is not a {@code ChronoField}, then the result of this method
713 * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
714 * passing {@code this} as the argument. Whether the value can be obtained,
715 * and what the value represents, is determined by the field.
716 *
717 * @param field the field to get, not null
718 * @return the value for the field
719 * @throws DateTimeException if a value for the field cannot be obtained
720 * @throws UnsupportedTemporalTypeException if the field is not supported
721 * @throws ArithmeticException if numeric overflow occurs
722 */
723 @Override
724 public long getLong(TemporalField field) {
725 if (field instanceof ChronoField chronoField) {
726 return (chronoField.isTimeBased() ? time.getLong(field) : date.getLong(field));
727 }
728 return field.getFrom(this);
729 }
730
731 //-----------------------------------------------------------------------
732 /**
733 * Gets the {@code LocalDate} part of this date-time.
734 * <p>
735 * This returns a {@code LocalDate} with the same year, month and day
736 * as this date-time.
737 *
738 * @return the date part of this date-time, not null
739 */
740 @Override
741 public LocalDate toLocalDate() {
742 return date;
743 }
744
745 /**
746 * Gets the year field.
747 * <p>
748 * This method returns the primitive {@code int} value for the year.
749 * <p>
750 * The year returned by this method is proleptic as per {@code get(YEAR)}.
751 * To obtain the year-of-era, use {@code get(YEAR_OF_ERA)}.
752 *
753 * @return the year, from MIN_YEAR to MAX_YEAR
754 */
755 public int getYear() {
756 return date.getYear();
757 }
758
759 /**
760 * Gets the month-of-year field from 1 to 12.
761 * <p>
762 * This method returns the month as an {@code int} from 1 to 12.
763 * Application code is frequently clearer if the enum {@link Month}
764 * is used by calling {@link #getMonth()}.
765 *
766 * @return the month-of-year, from 1 to 12
767 * @see #getMonth()
768 */
769 public int getMonthValue() {
770 return date.getMonthValue();
771 }
772
773 /**
774 * Gets the month-of-year field using the {@code Month} enum.
775 * <p>
776 * This method returns the enum {@link Month} for the month.
777 * This avoids confusion as to what {@code int} values mean.
778 * If you need access to the primitive {@code int} value then the enum
779 * provides the {@link Month#getValue() int value}.
780 *
781 * @return the month-of-year, not null
782 * @see #getMonthValue()
783 */
784 public Month getMonth() {
785 return date.getMonth();
786 }
787
788 /**
789 * Gets the day-of-month field.
790 * <p>
791 * This method returns the primitive {@code int} value for the day-of-month.
792 *
793 * @return the day-of-month, from 1 to 31
794 */
795 public int getDayOfMonth() {
796 return date.getDayOfMonth();
797 }
798
799 /**
800 * Gets the day-of-year field.
801 * <p>
802 * This method returns the primitive {@code int} value for the day-of-year.
803 *
804 * @return the day-of-year, from 1 to 365, or 366 in a leap year
805 */
806 public int getDayOfYear() {
807 return date.getDayOfYear();
808 }
809
810 /**
811 * Gets the day-of-week field, which is an enum {@code DayOfWeek}.
812 * <p>
813 * This method returns the enum {@link DayOfWeek} for the day-of-week.
814 * This avoids confusion as to what {@code int} values mean.
815 * If you need access to the primitive {@code int} value then the enum
816 * provides the {@link DayOfWeek#getValue() int value}.
817 * <p>
818 * Additional information can be obtained from the {@code DayOfWeek}.
819 * This includes textual names of the values.
820 *
821 * @return the day-of-week, not null
822 */
823 public DayOfWeek getDayOfWeek() {
824 return date.getDayOfWeek();
825 }
826
827 //-----------------------------------------------------------------------
828 /**
829 * Gets the {@code LocalTime} part of this date-time.
830 * <p>
831 * This returns a {@code LocalTime} with the same hour, minute, second and
832 * nanosecond as this date-time.
833 *
834 * @return the time part of this date-time, not null
835 */
836 @Override
837 public LocalTime toLocalTime() {
838 return time;
839 }
840
841 /**
842 * Gets the hour-of-day field.
843 *
844 * @return the hour-of-day, from 0 to 23
845 */
846 public int getHour() {
847 return time.getHour();
848 }
849
850 /**
851 * Gets the minute-of-hour field.
852 *
853 * @return the minute-of-hour, from 0 to 59
854 */
855 public int getMinute() {
856 return time.getMinute();
857 }
858
859 /**
860 * Gets the second-of-minute field.
861 *
862 * @return the second-of-minute, from 0 to 59
863 */
864 public int getSecond() {
865 return time.getSecond();
866 }
867
868 /**
869 * Gets the nano-of-second field.
870 *
871 * @return the nano-of-second, from 0 to 999,999,999
872 */
873 public int getNano() {
874 return time.getNano();
875 }
876
877 //-----------------------------------------------------------------------
878 /**
879 * Returns an adjusted copy of this date-time.
880 * <p>
881 * This returns a {@code LocalDateTime}, based on this one, with the date-time adjusted.
882 * The adjustment takes place using the specified adjuster strategy object.
883 * Read the documentation of the adjuster to understand what adjustment will be made.
884 * <p>
885 * A simple adjuster might simply set the one of the fields, such as the year field.
886 * A more complex adjuster might set the date to the last day of the month.
887 * <p>
888 * A selection of common adjustments is provided in
889 * {@link java.time.temporal.TemporalAdjusters TemporalAdjusters}.
890 * These include finding the "last day of the month" and "next Wednesday".
891 * Key date-time classes also implement the {@code TemporalAdjuster} interface,
892 * such as {@link Month} and {@link java.time.MonthDay MonthDay}.
893 * The adjuster is responsible for handling special cases, such as the varying
894 * lengths of month and leap years.
895 * <p>
896 * For example this code returns a date on the last day of July:
897 * <pre>
898 * import static java.time.Month.*;
899 * import static java.time.temporal.TemporalAdjusters.*;
900 *
901 * result = localDateTime.with(JULY).with(lastDayOfMonth());
902 * </pre>
903 * <p>
904 * The classes {@link LocalDate} and {@link LocalTime} implement {@code TemporalAdjuster},
905 * thus this method can be used to change the date, time or offset:
906 * <pre>
907 * result = localDateTime.with(date);
908 * result = localDateTime.with(time);
909 * </pre>
910 * <p>
911 * The result of this method is obtained by invoking the
912 * {@link TemporalAdjuster#adjustInto(Temporal)} method on the
913 * specified adjuster passing {@code this} as the argument.
914 * <p>
915 * This instance is immutable and unaffected by this method call.
916 *
917 * @param adjuster the adjuster to use, not null
918 * @return a {@code LocalDateTime} based on {@code this} with the adjustment made, not null
919 * @throws DateTimeException if the adjustment cannot be made
920 * @throws ArithmeticException if numeric overflow occurs
921 */
922 @Override
923 public LocalDateTime with(TemporalAdjuster adjuster) {
924 // optimizations
925 if (adjuster instanceof LocalDate) {
926 return with((LocalDate) adjuster, time);
927 } else if (adjuster instanceof LocalTime) {
928 return with(date, (LocalTime) adjuster);
929 } else if (adjuster instanceof LocalDateTime) {
930 return (LocalDateTime) adjuster;
931 }
932 return (LocalDateTime) adjuster.adjustInto(this);
933 }
934
935 /**
936 * Returns a copy of this date-time with the specified field set to a new value.
937 * <p>
938 * This returns a {@code LocalDateTime}, based on this one, with the value
939 * for the specified field changed.
940 * This can be used to change any supported field, such as the year, month or day-of-month.
941 * If it is not possible to set the value, because the field is not supported or for
942 * some other reason, an exception is thrown.
943 * <p>
944 * In some cases, changing the specified field can cause the resulting date-time to become invalid,
945 * such as changing the month from 31st January to February would make the day-of-month invalid.
946 * In cases like this, the field is responsible for resolving the date. Typically it will choose
947 * the previous valid date, which would be the last valid day of February in this example.
948 * <p>
949 * If the field is a {@link ChronoField} then the adjustment is implemented here.
950 * The {@link #isSupported(TemporalField) supported fields} will behave as per
951 * the matching method on {@link LocalDate#with(TemporalField, long) LocalDate}
952 * or {@link LocalTime#with(TemporalField, long) LocalTime}.
953 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
954 * <p>
955 * If the field is not a {@code ChronoField}, then the result of this method
956 * is obtained by invoking {@code TemporalField.adjustInto(Temporal, long)}
957 * passing {@code this} as the argument. In this case, the field determines
958 * whether and how to adjust the instant.
959 * <p>
960 * This instance is immutable and unaffected by this method call.
961 *
962 * @param field the field to set in the result, not null
963 * @param newValue the new value of the field in the result
964 * @return a {@code LocalDateTime} based on {@code this} with the specified field set, not null
965 * @throws DateTimeException if the field cannot be set
966 * @throws UnsupportedTemporalTypeException if the field is not supported
967 * @throws ArithmeticException if numeric overflow occurs
968 */
969 @Override
970 public LocalDateTime with(TemporalField field, long newValue) {
971 if (field instanceof ChronoField chronoField) {
972 if (chronoField.isTimeBased()) {
973 return with(date, time.with(field, newValue));
974 } else {
975 return with(date.with(field, newValue), time);
976 }
977 }
978 return field.adjustInto(this, newValue);
979 }
980
981 //-----------------------------------------------------------------------
982 /**
983 * Returns a copy of this {@code LocalDateTime} with the year altered.
984 * <p>
985 * The time does not affect the calculation and will be the same in the result.
986 * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
987 * <p>
988 * This instance is immutable and unaffected by this method call.
989 *
990 * @param year the year to set in the result, from MIN_YEAR to MAX_YEAR
991 * @return a {@code LocalDateTime} based on this date-time with the requested year, not null
992 * @throws DateTimeException if the year value is invalid
993 */
994 public LocalDateTime withYear(int year) {
995 return with(date.withYear(year), time);
996 }
997
998 /**
999 * Returns a copy of this {@code LocalDateTime} with the month-of-year altered.
1000 * <p>
1001 * The time does not affect the calculation and will be the same in the result.
1002 * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
1003 * <p>
1004 * This instance is immutable and unaffected by this method call.
1005 *
1006 * @param month the month-of-year to set in the result, from 1 (January) to 12 (December)
1007 * @return a {@code LocalDateTime} based on this date-time with the requested month, not null
1008 * @throws DateTimeException if the month-of-year value is invalid
1009 */
1010 public LocalDateTime withMonth(int month) {
1011 return with(date.withMonth(month), time);
1012 }
1013
1014 /**
1015 * Returns a copy of this {@code LocalDateTime} with the day-of-month altered.
1016 * <p>
1017 * If the resulting date-time is invalid, an exception is thrown.
1018 * The time does not affect the calculation and will be the same in the result.
1019 * <p>
1020 * This instance is immutable and unaffected by this method call.
1021 *
1022 * @param dayOfMonth the day-of-month to set in the result, from 1 to 28-31
1023 * @return a {@code LocalDateTime} based on this date-time with the requested day, not null
1024 * @throws DateTimeException if the day-of-month value is invalid,
1025 * or if the day-of-month is invalid for the month-year
1026 */
1027 public LocalDateTime withDayOfMonth(int dayOfMonth) {
1028 return with(date.withDayOfMonth(dayOfMonth), time);
1029 }
1030
1031 /**
1032 * Returns a copy of this {@code LocalDateTime} with the day-of-year altered.
1033 * <p>
1034 * If the resulting date-time is invalid, an exception is thrown.
1035 * <p>
1036 * This instance is immutable and unaffected by this method call.
1037 *
1038 * @param dayOfYear the day-of-year to set in the result, from 1 to 365-366
1039 * @return a {@code LocalDateTime} based on this date with the requested day, not null
1040 * @throws DateTimeException if the day-of-year value is invalid,
1041 * or if the day-of-year is invalid for the year
1042 */
1043 public LocalDateTime withDayOfYear(int dayOfYear) {
1044 return with(date.withDayOfYear(dayOfYear), time);
1045 }
1046
1047 //-----------------------------------------------------------------------
1048 /**
1049 * Returns a copy of this {@code LocalDateTime} with the hour-of-day altered.
1050 * <p>
1051 * This instance is immutable and unaffected by this method call.
1052 *
1053 * @param hour the hour-of-day to set in the result, from 0 to 23
1054 * @return a {@code LocalDateTime} based on this date-time with the requested hour, not null
1055 * @throws DateTimeException if the hour value is invalid
1056 */
1057 public LocalDateTime withHour(int hour) {
1058 LocalTime newTime = time.withHour(hour);
1059 return with(date, newTime);
1060 }
1061
1062 /**
1063 * Returns a copy of this {@code LocalDateTime} with the minute-of-hour altered.
1064 * <p>
1065 * This instance is immutable and unaffected by this method call.
1066 *
1067 * @param minute the minute-of-hour to set in the result, from 0 to 59
1068 * @return a {@code LocalDateTime} based on this date-time with the requested minute, not null
1069 * @throws DateTimeException if the minute value is invalid
1070 */
1071 public LocalDateTime withMinute(int minute) {
1072 LocalTime newTime = time.withMinute(minute);
1073 return with(date, newTime);
1074 }
1075
1076 /**
1077 * Returns a copy of this {@code LocalDateTime} with the second-of-minute altered.
1078 * <p>
1079 * This instance is immutable and unaffected by this method call.
1080 *
1081 * @param second the second-of-minute to set in the result, from 0 to 59
1082 * @return a {@code LocalDateTime} based on this date-time with the requested second, not null
1083 * @throws DateTimeException if the second value is invalid
1084 */
1085 public LocalDateTime withSecond(int second) {
1086 LocalTime newTime = time.withSecond(second);
1087 return with(date, newTime);
1088 }
1089
1090 /**
1091 * Returns a copy of this {@code LocalDateTime} with the nano-of-second altered.
1092 * <p>
1093 * This instance is immutable and unaffected by this method call.
1094 *
1095 * @param nanoOfSecond the nano-of-second to set in the result, from 0 to 999,999,999
1096 * @return a {@code LocalDateTime} based on this date-time with the requested nanosecond, not null
1097 * @throws DateTimeException if the nano value is invalid
1098 */
1099 public LocalDateTime withNano(int nanoOfSecond) {
1100 LocalTime newTime = time.withNano(nanoOfSecond);
1101 return with(date, newTime);
1102 }
1103
1104 //-----------------------------------------------------------------------
1105 /**
1106 * Returns a copy of this {@code LocalDateTime} with the time truncated.
1107 * <p>
1108 * Truncation returns a copy of the original date-time with fields
1109 * smaller than the specified unit set to zero.
1110 * For example, truncating with the {@link ChronoUnit#MINUTES minutes} unit
1111 * will set the second-of-minute and nano-of-second field to zero.
1112 * <p>
1113 * The unit must have a {@linkplain TemporalUnit#getDuration() duration}
1114 * that divides into the length of a standard day without remainder.
1115 * This includes all supplied time units on {@link ChronoUnit} and
1116 * {@link ChronoUnit#DAYS DAYS}. Other units throw an exception.
1117 * <p>
1118 * This instance is immutable and unaffected by this method call.
1119 *
1120 * @param unit the unit to truncate to, not null
1121 * @return a {@code LocalDateTime} based on this date-time with the time truncated, not null
1122 * @throws DateTimeException if unable to truncate
1123 * @throws UnsupportedTemporalTypeException if the unit is not supported
1124 */
1125 public LocalDateTime truncatedTo(TemporalUnit unit) {
1126 return with(date, time.truncatedTo(unit));
1127 }
1128
1129 //-----------------------------------------------------------------------
1130 /**
1131 * Returns a copy of this date-time with the specified amount added.
1132 * <p>
1133 * This returns a {@code LocalDateTime}, based on this one, with the specified amount added.
1134 * The amount is typically {@link Period} or {@link Duration} but may be
1135 * any other type implementing the {@link TemporalAmount} interface.
1136 * <p>
1137 * The calculation is delegated to the amount object by calling
1138 * {@link TemporalAmount#addTo(Temporal)}. The amount implementation is free
1139 * to implement the addition in any way it wishes, however it typically
1140 * calls back to {@link #plus(long, TemporalUnit)}. Consult the documentation
1141 * of the amount implementation to determine if it can be successfully added.
1142 * <p>
1143 * This instance is immutable and unaffected by this method call.
1144 *
1145 * @param amountToAdd the amount to add, not null
1146 * @return a {@code LocalDateTime} based on this date-time with the addition made, not null
1147 * @throws DateTimeException if the addition cannot be made
1148 * @throws ArithmeticException if numeric overflow occurs
1149 */
1150 @Override
1151 public LocalDateTime plus(TemporalAmount amountToAdd) {
1152 if (amountToAdd instanceof Period periodToAdd) {
1153 return with(date.plus(periodToAdd), time);
1154 }
1155 Objects.requireNonNull(amountToAdd, "amountToAdd");
1156 return (LocalDateTime) amountToAdd.addTo(this);
1157 }
1158
1159 /**
1160 * Returns a copy of this date-time with the specified amount added.
1161 * <p>
1162 * This returns a {@code LocalDateTime}, based on this one, with the amount
1163 * in terms of the unit added. If it is not possible to add the amount, because the
1164 * unit is not supported or for some other reason, an exception is thrown.
1165 * <p>
1166 * If the field is a {@link ChronoUnit} then the addition is implemented here.
1167 * Date units are added as per {@link LocalDate#plus(long, TemporalUnit)}.
1168 * Time units are added as per {@link LocalTime#plus(long, TemporalUnit)} with
1169 * any overflow in days added equivalent to using {@link #plusDays(long)}.
1170 * <p>
1171 * If the field is not a {@code ChronoUnit}, then the result of this method
1172 * is obtained by invoking {@code TemporalUnit.addTo(Temporal, long)}
1173 * passing {@code this} as the argument. In this case, the unit determines
1174 * whether and how to perform the addition.
1175 * <p>
1176 * This instance is immutable and unaffected by this method call.
1177 *
1178 * @param amountToAdd the amount of the unit to add to the result, may be negative
1179 * @param unit the unit of the amount to add, not null
1180 * @return a {@code LocalDateTime} based on this date-time with the specified amount added, not null
1181 * @throws DateTimeException if the addition cannot be made
1182 * @throws UnsupportedTemporalTypeException if the unit is not supported
1183 * @throws ArithmeticException if numeric overflow occurs
1184 */
1185 @Override
1186 public LocalDateTime plus(long amountToAdd, TemporalUnit unit) {
1187 if (unit instanceof ChronoUnit chronoUnit) {
1188 return switch (chronoUnit) {
1189 case NANOS -> plusNanos(amountToAdd);
1190 case MICROS -> plusDays(amountToAdd / MICROS_PER_DAY).plusNanos((amountToAdd % MICROS_PER_DAY) * 1000);
1191 case MILLIS -> plusDays(amountToAdd / MILLIS_PER_DAY).plusNanos((amountToAdd % MILLIS_PER_DAY) * 1000_000);
1192 case SECONDS -> plusSeconds(amountToAdd);
1193 case MINUTES -> plusMinutes(amountToAdd);
1194 case HOURS -> plusHours(amountToAdd);
1195 case HALF_DAYS -> plusDays(amountToAdd / 256).plusHours((amountToAdd % 256) * 12); // no overflow (256 is multiple of 2)
1196 default -> with(date.plus(amountToAdd, unit), time);
1197 };
1198 }
1199 return unit.addTo(this, amountToAdd);
1200 }
1201
1202 //-----------------------------------------------------------------------
1203 /**
1204 * Returns a copy of this {@code LocalDateTime} with the specified number of years added.
1205 * <p>
1206 * This method adds the specified amount to the years field in three steps:
1207 * <ol>
1208 * <li>Add the input years to the year field</li>
1209 * <li>Check if the resulting date would be invalid</li>
1210 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1211 * </ol>
1212 * <p>
1213 * For example, 2008-02-29 (leap year) plus one year would result in the
1214 * invalid date 2009-02-29 (standard year). Instead of returning an invalid
1215 * result, the last valid day of the month, 2009-02-28, is selected instead.
1216 * <p>
1217 * This instance is immutable and unaffected by this method call.
1218 *
1219 * @param years the years to add, may be negative
1220 * @return a {@code LocalDateTime} based on this date-time with the years added, not null
1221 * @throws DateTimeException if the result exceeds the supported date range
1222 */
1223 public LocalDateTime plusYears(long years) {
1224 LocalDate newDate = date.plusYears(years);
1225 return with(newDate, time);
1226 }
1227
1228 /**
1229 * Returns a copy of this {@code LocalDateTime} with the specified number of months added.
1230 * <p>
1231 * This method adds the specified amount to the months field in three steps:
1232 * <ol>
1233 * <li>Add the input months to the month-of-year field</li>
1234 * <li>Check if the resulting date would be invalid</li>
1235 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1236 * </ol>
1237 * <p>
1238 * For example, 2007-03-31 plus one month would result in the invalid date
1239 * 2007-04-31. Instead of returning an invalid result, the last valid day
1240 * of the month, 2007-04-30, is selected instead.
1241 * <p>
1242 * This instance is immutable and unaffected by this method call.
1243 *
1244 * @param months the months to add, may be negative
1245 * @return a {@code LocalDateTime} based on this date-time with the months added, not null
1246 * @throws DateTimeException if the result exceeds the supported date range
1247 */
1248 public LocalDateTime plusMonths(long months) {
1249 LocalDate newDate = date.plusMonths(months);
1250 return with(newDate, time);
1251 }
1252
1253 /**
1254 * Returns a copy of this {@code LocalDateTime} with the specified number of weeks added.
1255 * <p>
1256 * This method adds the specified amount in weeks to the days field incrementing
1257 * the month and year fields as necessary to ensure the result remains valid.
1258 * The result is only invalid if the maximum/minimum year is exceeded.
1259 * <p>
1260 * For example, 2008-12-31 plus one week would result in 2009-01-07.
1261 * <p>
1262 * This instance is immutable and unaffected by this method call.
1263 *
1264 * @param weeks the weeks to add, may be negative
1265 * @return a {@code LocalDateTime} based on this date-time with the weeks added, not null
1266 * @throws DateTimeException if the result exceeds the supported date range
1267 */
1268 public LocalDateTime plusWeeks(long weeks) {
1269 LocalDate newDate = date.plusWeeks(weeks);
1270 return with(newDate, time);
1271 }
1272
1273 /**
1274 * Returns a copy of this {@code LocalDateTime} with the specified number of days added.
1275 * <p>
1276 * This method adds the specified amount to the days field incrementing the
1277 * month and year fields as necessary to ensure the result remains valid.
1278 * The result is only invalid if the maximum/minimum year is exceeded.
1279 * <p>
1280 * For example, 2008-12-31 plus one day would result in 2009-01-01.
1281 * <p>
1282 * This instance is immutable and unaffected by this method call.
1283 *
1284 * @param days the days to add, may be negative
1285 * @return a {@code LocalDateTime} based on this date-time with the days added, not null
1286 * @throws DateTimeException if the result exceeds the supported date range
1287 */
1288 public LocalDateTime plusDays(long days) {
1289 LocalDate newDate = date.plusDays(days);
1290 return with(newDate, time);
1291 }
1292
1293 //-----------------------------------------------------------------------
1294 /**
1295 * Returns a copy of this {@code LocalDateTime} with the specified number of hours added.
1296 * <p>
1297 * This instance is immutable and unaffected by this method call.
1298 *
1299 * @param hours the hours to add, may be negative
1300 * @return a {@code LocalDateTime} based on this date-time with the hours added, not null
1301 * @throws DateTimeException if the result exceeds the supported date range
1302 */
1303 public LocalDateTime plusHours(long hours) {
1304 return plusWithOverflow(date, hours, 0, 0, 0, 1);
1305 }
1306
1307 /**
1308 * Returns a copy of this {@code LocalDateTime} with the specified number of minutes added.
1309 * <p>
1310 * This instance is immutable and unaffected by this method call.
1311 *
1312 * @param minutes the minutes to add, may be negative
1313 * @return a {@code LocalDateTime} based on this date-time with the minutes added, not null
1314 * @throws DateTimeException if the result exceeds the supported date range
1315 */
1316 public LocalDateTime plusMinutes(long minutes) {
1317 return plusWithOverflow(date, 0, minutes, 0, 0, 1);
1318 }
1319
1320 /**
1321 * Returns a copy of this {@code LocalDateTime} with the specified number of seconds added.
1322 * <p>
1323 * This instance is immutable and unaffected by this method call.
1324 *
1325 * @param seconds the seconds to add, may be negative
1326 * @return a {@code LocalDateTime} based on this date-time with the seconds added, not null
1327 * @throws DateTimeException if the result exceeds the supported date range
1328 */
1329 public LocalDateTime plusSeconds(long seconds) {
1330 return plusWithOverflow(date, 0, 0, seconds, 0, 1);
1331 }
1332
1333 /**
1334 * Returns a copy of this {@code LocalDateTime} with the specified number of nanoseconds added.
1335 * <p>
1336 * This instance is immutable and unaffected by this method call.
1337 *
1338 * @param nanos the nanos to add, may be negative
1339 * @return a {@code LocalDateTime} based on this date-time with the nanoseconds added, not null
1340 * @throws DateTimeException if the result exceeds the supported date range
1341 */
1342 public LocalDateTime plusNanos(long nanos) {
1343 return plusWithOverflow(date, 0, 0, 0, nanos, 1);
1344 }
1345
1346 //-----------------------------------------------------------------------
1347 /**
1348 * Returns a copy of this date-time with the specified amount subtracted.
1349 * <p>
1350 * This returns a {@code LocalDateTime}, based on this one, with the specified amount subtracted.
1351 * The amount is typically {@link Period} or {@link Duration} but may be
1352 * any other type implementing the {@link TemporalAmount} interface.
1353 * <p>
1354 * The calculation is delegated to the amount object by calling
1355 * {@link TemporalAmount#subtractFrom(Temporal)}. The amount implementation is free
1356 * to implement the subtraction in any way it wishes, however it typically
1357 * calls back to {@link #minus(long, TemporalUnit)}. Consult the documentation
1358 * of the amount implementation to determine if it can be successfully subtracted.
1359 * <p>
1360 * This instance is immutable and unaffected by this method call.
1361 *
1362 * @param amountToSubtract the amount to subtract, not null
1363 * @return a {@code LocalDateTime} based on this date-time with the subtraction made, not null
1364 * @throws DateTimeException if the subtraction cannot be made
1365 * @throws ArithmeticException if numeric overflow occurs
1366 */
1367 @Override
1368 public LocalDateTime minus(TemporalAmount amountToSubtract) {
1369 if (amountToSubtract instanceof Period periodToSubtract) {
1370 return with(date.minus(periodToSubtract), time);
1371 }
1372 Objects.requireNonNull(amountToSubtract, "amountToSubtract");
1373 return (LocalDateTime) amountToSubtract.subtractFrom(this);
1374 }
1375
1376 /**
1377 * Returns a copy of this date-time with the specified amount subtracted.
1378 * <p>
1379 * This returns a {@code LocalDateTime}, based on this one, with the amount
1380 * in terms of the unit subtracted. If it is not possible to subtract the amount,
1381 * because the unit is not supported or for some other reason, an exception is thrown.
1382 * <p>
1383 * This method is equivalent to {@link #plus(long, TemporalUnit)} with the amount negated.
1384 * See that method for a full description of how addition, and thus subtraction, works.
1385 * <p>
1386 * This instance is immutable and unaffected by this method call.
1387 *
1388 * @param amountToSubtract the amount of the unit to subtract from the result, may be negative
1389 * @param unit the unit of the amount to subtract, not null
1390 * @return a {@code LocalDateTime} based on this date-time with the specified amount subtracted, not null
1391 * @throws DateTimeException if the subtraction cannot be made
1392 * @throws UnsupportedTemporalTypeException if the unit is not supported
1393 * @throws ArithmeticException if numeric overflow occurs
1394 */
1395 @Override
1396 public LocalDateTime minus(long amountToSubtract, TemporalUnit unit) {
1397 return (amountToSubtract == Long.MIN_VALUE ? plus(Long.MAX_VALUE, unit).plus(1, unit) : plus(-amountToSubtract, unit));
1398 }
1399
1400 //-----------------------------------------------------------------------
1401 /**
1402 * Returns a copy of this {@code LocalDateTime} with the specified number of years subtracted.
1403 * <p>
1404 * This method subtracts the specified amount from the years field in three steps:
1405 * <ol>
1406 * <li>Subtract the input years from the year field</li>
1407 * <li>Check if the resulting date would be invalid</li>
1408 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1409 * </ol>
1410 * <p>
1411 * For example, 2008-02-29 (leap year) minus one year would result in the
1412 * invalid date 2007-02-29 (standard year). Instead of returning an invalid
1413 * result, the last valid day of the month, 2007-02-28, is selected instead.
1414 * <p>
1415 * This instance is immutable and unaffected by this method call.
1416 *
1417 * @param years the years to subtract, may be negative
1418 * @return a {@code LocalDateTime} based on this date-time with the years subtracted, not null
1419 * @throws DateTimeException if the result exceeds the supported date range
1420 */
1421 public LocalDateTime minusYears(long years) {
1422 return (years == Long.MIN_VALUE ? plusYears(Long.MAX_VALUE).plusYears(1) : plusYears(-years));
1423 }
1424
1425 /**
1426 * Returns a copy of this {@code LocalDateTime} with the specified number of months subtracted.
1427 * <p>
1428 * This method subtracts the specified amount from the months field in three steps:
1429 * <ol>
1430 * <li>Subtract the input months from the month-of-year field</li>
1431 * <li>Check if the resulting date would be invalid</li>
1432 * <li>Adjust the day-of-month to the last valid day if necessary</li>
1433 * </ol>
1434 * <p>
1435 * For example, 2007-03-31 minus one month would result in the invalid date
1436 * 2007-02-31. Instead of returning an invalid result, the last valid day
1437 * of the month, 2007-02-28, is selected instead.
1438 * <p>
1439 * This instance is immutable and unaffected by this method call.
1440 *
1441 * @param months the months to subtract, may be negative
1442 * @return a {@code LocalDateTime} based on this date-time with the months subtracted, not null
1443 * @throws DateTimeException if the result exceeds the supported date range
1444 */
1445 public LocalDateTime minusMonths(long months) {
1446 return (months == Long.MIN_VALUE ? plusMonths(Long.MAX_VALUE).plusMonths(1) : plusMonths(-months));
1447 }
1448
1449 /**
1450 * Returns a copy of this {@code LocalDateTime} with the specified number of weeks subtracted.
1451 * <p>
1452 * This method subtracts the specified amount in weeks from the days field decrementing
1453 * the month and year fields as necessary to ensure the result remains valid.
1454 * The result is only invalid if the maximum/minimum year is exceeded.
1455 * <p>
1456 * For example, 2009-01-07 minus one week would result in 2008-12-31.
1457 * <p>
1458 * This instance is immutable and unaffected by this method call.
1459 *
1460 * @param weeks the weeks to subtract, may be negative
1461 * @return a {@code LocalDateTime} based on this date-time with the weeks subtracted, not null
1462 * @throws DateTimeException if the result exceeds the supported date range
1463 */
1464 public LocalDateTime minusWeeks(long weeks) {
1465 return (weeks == Long.MIN_VALUE ? plusWeeks(Long.MAX_VALUE).plusWeeks(1) : plusWeeks(-weeks));
1466 }
1467
1468 /**
1469 * Returns a copy of this {@code LocalDateTime} with the specified number of days subtracted.
1470 * <p>
1471 * This method subtracts the specified amount from the days field decrementing the
1472 * month and year fields as necessary to ensure the result remains valid.
1473 * The result is only invalid if the maximum/minimum year is exceeded.
1474 * <p>
1475 * For example, 2009-01-01 minus one day would result in 2008-12-31.
1476 * <p>
1477 * This instance is immutable and unaffected by this method call.
1478 *
1479 * @param days the days to subtract, may be negative
1480 * @return a {@code LocalDateTime} based on this date-time with the days subtracted, not null
1481 * @throws DateTimeException if the result exceeds the supported date range
1482 */
1483 public LocalDateTime minusDays(long days) {
1484 return (days == Long.MIN_VALUE ? plusDays(Long.MAX_VALUE).plusDays(1) : plusDays(-days));
1485 }
1486
1487 //-----------------------------------------------------------------------
1488 /**
1489 * Returns a copy of this {@code LocalDateTime} with the specified number of hours subtracted.
1490 * <p>
1491 * This instance is immutable and unaffected by this method call.
1492 *
1493 * @param hours the hours to subtract, may be negative
1494 * @return a {@code LocalDateTime} based on this date-time with the hours subtracted, not null
1495 * @throws DateTimeException if the result exceeds the supported date range
1496 */
1497 public LocalDateTime minusHours(long hours) {
1498 return plusWithOverflow(date, hours, 0, 0, 0, -1);
1499 }
1500
1501 /**
1502 * Returns a copy of this {@code LocalDateTime} with the specified number of minutes subtracted.
1503 * <p>
1504 * This instance is immutable and unaffected by this method call.
1505 *
1506 * @param minutes the minutes to subtract, may be negative
1507 * @return a {@code LocalDateTime} based on this date-time with the minutes subtracted, not null
1508 * @throws DateTimeException if the result exceeds the supported date range
1509 */
1510 public LocalDateTime minusMinutes(long minutes) {
1511 return plusWithOverflow(date, 0, minutes, 0, 0, -1);
1512 }
1513
1514 /**
1515 * Returns a copy of this {@code LocalDateTime} with the specified number of seconds subtracted.
1516 * <p>
1517 * This instance is immutable and unaffected by this method call.
1518 *
1519 * @param seconds the seconds to subtract, may be negative
1520 * @return a {@code LocalDateTime} based on this date-time with the seconds subtracted, not null
1521 * @throws DateTimeException if the result exceeds the supported date range
1522 */
1523 public LocalDateTime minusSeconds(long seconds) {
1524 return plusWithOverflow(date, 0, 0, seconds, 0, -1);
1525 }
1526
1527 /**
1528 * Returns a copy of this {@code LocalDateTime} with the specified number of nanoseconds subtracted.
1529 * <p>
1530 * This instance is immutable and unaffected by this method call.
1531 *
1532 * @param nanos the nanos to subtract, may be negative
1533 * @return a {@code LocalDateTime} based on this date-time with the nanoseconds subtracted, not null
1534 * @throws DateTimeException if the result exceeds the supported date range
1535 */
1536 public LocalDateTime minusNanos(long nanos) {
1537 return plusWithOverflow(date, 0, 0, 0, nanos, -1);
1538 }
1539
1540 //-----------------------------------------------------------------------
1541 /**
1542 * Returns a copy of this {@code LocalDateTime} with the specified period added.
1543 * <p>
1544 * This instance is immutable and unaffected by this method call.
1545 *
1546 * @param newDate the new date to base the calculation on, not null
1547 * @param hours the hours to add, may be negative
1548 * @param minutes the minutes to add, may be negative
1549 * @param seconds the seconds to add, may be negative
1550 * @param nanos the nanos to add, may be negative
1551 * @param sign the sign to determine add or subtract
1552 * @return the combined result, not null
1553 */
1554 private LocalDateTime plusWithOverflow(LocalDate newDate, long hours, long minutes, long seconds, long nanos, int sign) {
1555 // 9223372036854775808 long, 2147483648 int
1556 if ((hours | minutes | seconds | nanos) == 0) {
1557 return with(newDate, time);
1558 }
1559 long totDays = nanos / NANOS_PER_DAY + // max/24*60*60*1B
1560 seconds / SECONDS_PER_DAY + // max/24*60*60
1561 minutes / MINUTES_PER_DAY + // max/24*60
1562 hours / HOURS_PER_DAY; // max/24
1563 totDays *= sign; // total max*0.4237...
1564 long totNanos = nanos % NANOS_PER_DAY + // max 86400000000000
1565 (seconds % SECONDS_PER_DAY) * NANOS_PER_SECOND + // max 86400000000000
1566 (minutes % MINUTES_PER_DAY) * NANOS_PER_MINUTE + // max 86400000000000
1567 (hours % HOURS_PER_DAY) * NANOS_PER_HOUR; // max 86400000000000
1568 long curNoD = time.toNanoOfDay(); // max 86400000000000
1569 totNanos = totNanos * sign + curNoD; // total 432000000000000
1570 totDays += Math.floorDiv(totNanos, NANOS_PER_DAY);
1571 long newNoD = Math.floorMod(totNanos, NANOS_PER_DAY);
1572 LocalTime newTime = (newNoD == curNoD ? time : LocalTime.ofNanoOfDay(newNoD));
1573 return with(newDate.plusDays(totDays), newTime);
1574 }
1575
1576 //-----------------------------------------------------------------------
1577 /**
1578 * Queries this date-time using the specified query.
1579 * <p>
1580 * This queries this date-time using the specified query strategy object.
1581 * The {@code TemporalQuery} object defines the logic to be used to
1582 * obtain the result. Read the documentation of the query to understand
1583 * what the result of this method will be.
1584 * <p>
1585 * The result of this method is obtained by invoking the
1586 * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
1587 * specified query passing {@code this} as the argument.
1588 *
1589 * @param <R> the type of the result
1590 * @param query the query to invoke, not null
1591 * @return the query result, null may be returned (defined by the query)
1592 * @throws DateTimeException if unable to query (defined by the query)
1593 * @throws ArithmeticException if numeric overflow occurs (defined by the query)
1594 */
1595 @SuppressWarnings("unchecked")
1596 @Override // override for Javadoc
1597 public <R> R query(TemporalQuery<R> query) {
1598 if (query == TemporalQueries.localDate()) {
1599 return (R) date;
1600 }
1601 return ChronoLocalDateTime.super.query(query);
1602 }
1603
1604 /**
1605 * Adjusts the specified temporal object to have the same date and time as this object.
1606 * <p>
1607 * This returns a temporal object of the same observable type as the input
1608 * with the date and time changed to be the same as this.
1609 * <p>
1610 * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)}
1611 * twice, passing {@link ChronoField#EPOCH_DAY} and
1612 * {@link ChronoField#NANO_OF_DAY} as the fields.
1613 * <p>
1614 * In most cases, it is clearer to reverse the calling pattern by using
1615 * {@link Temporal#with(TemporalAdjuster)}:
1616 * <pre>
1617 * // these two lines are equivalent, but the second approach is recommended
1618 * temporal = thisLocalDateTime.adjustInto(temporal);
1619 * temporal = temporal.with(thisLocalDateTime);
1620 * </pre>
1621 * <p>
1622 * This instance is immutable and unaffected by this method call.
1623 *
1624 * @param temporal the target object to be adjusted, not null
1625 * @return the adjusted object, not null
1626 * @throws DateTimeException if unable to make the adjustment
1627 * @throws ArithmeticException if numeric overflow occurs
1628 */
1629 @Override // override for Javadoc
1630 public Temporal adjustInto(Temporal temporal) {
1631 return ChronoLocalDateTime.super.adjustInto(temporal);
1632 }
1633
1634 /**
1635 * Calculates the amount of time until another date-time in terms of the specified unit.
1636 * <p>
1637 * This calculates the amount of time between two {@code LocalDateTime}
1638 * objects in terms of a single {@code TemporalUnit}.
1639 * The start and end points are {@code this} and the specified date-time.
1640 * The result will be negative if the end is before the start.
1641 * The {@code Temporal} passed to this method is converted to a
1642 * {@code LocalDateTime} using {@link #from(TemporalAccessor)}.
1643 * For example, the amount in days between two date-times can be calculated
1644 * using {@code startDateTime.until(endDateTime, DAYS)}.
1645 * <p>
1646 * The calculation returns a whole number, representing the number of
1647 * complete units between the two date-times.
1648 * For example, the amount in months between 2012-06-15T00:00 and 2012-08-14T23:59
1649 * will only be one month as it is one minute short of two months.
1650 * <p>
1651 * There are two equivalent ways of using this method.
1652 * The first is to invoke this method.
1653 * The second is to use {@link TemporalUnit#between(Temporal, Temporal)}:
1654 * <pre>
1655 * // these two lines are equivalent
1656 * amount = start.until(end, MONTHS);
1657 * amount = MONTHS.between(start, end);
1658 * </pre>
1659 * The choice should be made based on which makes the code more readable.
1660 * <p>
1661 * The calculation is implemented in this method for {@link ChronoUnit}.
1662 * The units {@code NANOS}, {@code MICROS}, {@code MILLIS}, {@code SECONDS},
1663 * {@code MINUTES}, {@code HOURS} and {@code HALF_DAYS}, {@code DAYS},
1664 * {@code WEEKS}, {@code MONTHS}, {@code YEARS}, {@code DECADES},
1665 * {@code CENTURIES}, {@code MILLENNIA} and {@code ERAS} are supported.
1666 * Other {@code ChronoUnit} values will throw an exception.
1667 * <p>
1668 * If the unit is not a {@code ChronoUnit}, then the result of this method
1669 * is obtained by invoking {@code TemporalUnit.between(Temporal, Temporal)}
1670 * passing {@code this} as the first argument and the converted input temporal
1671 * as the second argument.
1672 * <p>
1673 * This instance is immutable and unaffected by this method call.
1674 *
1675 * @param endExclusive the end date, exclusive, which is converted to a {@code LocalDateTime}, not null
1676 * @param unit the unit to measure the amount in, not null
1677 * @return the amount of time between this date-time and the end date-time
1678 * @throws DateTimeException if the amount cannot be calculated, or the end
1679 * temporal cannot be converted to a {@code LocalDateTime}
1680 * @throws UnsupportedTemporalTypeException if the unit is not supported
1681 * @throws ArithmeticException if numeric overflow occurs
1682 */
1683 @Override
1684 public long until(Temporal endExclusive, TemporalUnit unit) {
1685 LocalDateTime end = LocalDateTime.from(endExclusive);
1686 if (unit instanceof ChronoUnit chronoUnit) {
1687 if (unit.isTimeBased()) {
1688 long amount = date.daysUntil(end.date);
1689 if (amount == 0) {
1690 return time.until(end.time, unit);
1691 }
1692 long timePart = end.time.toNanoOfDay() - time.toNanoOfDay();
1693 if (amount > 0) {
1694 amount--; // safe
1695 timePart += NANOS_PER_DAY; // safe
1696 } else {
1697 amount++; // safe
1698 timePart -= NANOS_PER_DAY; // safe
1699 }
1700 switch (chronoUnit) {
1701 case NANOS:
1702 amount = Math.multiplyExact(amount, NANOS_PER_DAY);
1703 break;
1704 case MICROS:
1705 amount = Math.multiplyExact(amount, MICROS_PER_DAY);
1706 timePart = timePart / 1000;
1707 break;
1708 case MILLIS:
1709 amount = Math.multiplyExact(amount, MILLIS_PER_DAY);
1710 timePart = timePart / 1_000_000;
1711 break;
1712 case SECONDS:
1713 amount = Math.multiplyExact(amount, SECONDS_PER_DAY);
1714 timePart = timePart / NANOS_PER_SECOND;
1715 break;
1716 case MINUTES:
1717 amount = Math.multiplyExact(amount, MINUTES_PER_DAY);
1718 timePart = timePart / NANOS_PER_MINUTE;
1719 break;
1720 case HOURS:
1721 amount = Math.multiplyExact(amount, HOURS_PER_DAY);
1722 timePart = timePart / NANOS_PER_HOUR;
1723 break;
1724 case HALF_DAYS:
1725 amount = Math.multiplyExact(amount, 2);
1726 timePart = timePart / (NANOS_PER_HOUR * 12);
1727 break;
1728 }
1729 return Math.addExact(amount, timePart);
1730 }
1731 LocalDate endDate = end.date;
1732 if (endDate.isAfter(date) && end.time.isBefore(time)) {
1733 endDate = endDate.minusDays(1);
1734 } else if (endDate.isBefore(date) && end.time.isAfter(time)) {
1735 endDate = endDate.plusDays(1);
1736 }
1737 return date.until(endDate, unit);
1738 }
1739 return unit.between(this, end);
1740 }
1741
1742 /**
1743 * Formats this date-time using the specified formatter.
1744 * <p>
1745 * This date-time will be passed to the formatter to produce a string.
1746 *
1747 * @param formatter the formatter to use, not null
1748 * @return the formatted date-time string, not null
1749 * @throws DateTimeException if an error occurs during printing
1750 */
1751 @Override // override for Javadoc and performance
1752 public String format(DateTimeFormatter formatter) {
1753 Objects.requireNonNull(formatter, "formatter");
1754 return formatter.format(this);
1755 }
1756
1757 //-----------------------------------------------------------------------
1758 /**
1759 * Combines this date-time with an offset to create an {@code OffsetDateTime}.
1760 * <p>
1761 * This returns an {@code OffsetDateTime} formed from this date-time at the specified offset.
1762 * All possible combinations of date-time and offset are valid.
1763 *
1764 * @param offset the offset to combine with, not null
1765 * @return the offset date-time formed from this date-time and the specified offset, not null
1766 */
1767 public OffsetDateTime atOffset(ZoneOffset offset) {
1768 return OffsetDateTime.of(this, offset);
1769 }
1770
1771 /**
1772 * Combines this date-time with a time-zone to create a {@code ZonedDateTime}.
1773 * <p>
1774 * This returns a {@code ZonedDateTime} formed from this date-time at the
1775 * specified time-zone. The result will match this date-time as closely as possible.
1776 * Time-zone rules, such as daylight savings, mean that not every local date-time
1777 * is valid for the specified zone, thus the local date-time may be adjusted.
1778 * <p>
1779 * The local date-time is resolved to a single instant on the time-line.
1780 * This is achieved by finding a valid offset from UTC/Greenwich for the local
1781 * date-time as defined by the {@link ZoneRules rules} of the zone ID.
1782 *<p>
1783 * In most cases, there is only one valid offset for a local date-time.
1784 * In the case of an overlap, where clocks are set back, there are two valid offsets.
1785 * This method uses the earlier offset typically corresponding to "summer".
1786 * <p>
1787 * In the case of a gap, where clocks jump forward, there is no valid offset.
1788 * Instead, the local date-time is adjusted to be later by the length of the gap.
1789 * For a typical one hour daylight savings change, the local date-time will be
1790 * moved one hour later into the offset typically corresponding to "summer".
1791 * <p>
1792 * To obtain the later offset during an overlap, call
1793 * {@link ZonedDateTime#withLaterOffsetAtOverlap()} on the result of this method.
1794 * To throw an exception when there is a gap or overlap, use
1795 * {@link ZonedDateTime#ofStrict(LocalDateTime, ZoneOffset, ZoneId)}.
1796 *
1797 * @param zone the time-zone to use, not null
1798 * @return the zoned date-time formed from this date-time, not null
1799 */
1800 @Override
1801 public ZonedDateTime atZone(ZoneId zone) {
1802 return ZonedDateTime.of(this, zone);
1803 }
1804
1805 //-----------------------------------------------------------------------
1806 /**
1807 * Compares this date-time to another date-time.
1808 * <p>
1809 * The comparison is primarily based on the date-time, from earliest to latest.
1810 * It is "consistent with equals", as defined by {@link Comparable}.
1811 * <p>
1812 * If all the date-times being compared are instances of {@code LocalDateTime},
1813 * then the comparison will be entirely based on the date-time.
1814 * If some dates being compared are in different chronologies, then the
1815 * chronology is also considered, see {@link ChronoLocalDateTime#compareTo}.
1816 *
1817 * @param other the other date-time to compare to, not null
1818 * @return the comparator value, that is the comparison of this local date-time with
1819 * the {@code other} local date-time and this chronology with the {@code other} chronology,
1820 * in order, returning the first non-zero result, and otherwise returning zero
1821 * @see #isBefore
1822 * @see #isAfter
1823 */
1824 @Override // override for Javadoc and performance
1825 public int compareTo(ChronoLocalDateTime<?> other) {
1826 if (other instanceof LocalDateTime) {
1827 return compareTo0((LocalDateTime) other);
1828 }
1829 return ChronoLocalDateTime.super.compareTo(other);
1830 }
1831
1832 private int compareTo0(LocalDateTime other) {
1833 int cmp = date.compareTo0(other.toLocalDate());
1834 if (cmp == 0) {
1835 cmp = time.compareTo(other.toLocalTime());
1836 }
1837 return cmp;
1838 }
1839
1840 /**
1841 * Checks if this date-time is after the specified date-time.
1842 * <p>
1843 * This checks to see if this date-time represents a point on the
1844 * local time-line after the other date-time.
1845 * <pre>
1846 * LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
1847 * LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
1848 * a.isAfter(b) == false
1849 * a.isAfter(a) == false
1850 * b.isAfter(a) == true
1851 * </pre>
1852 * <p>
1853 * This method only considers the position of the two date-times on the local time-line.
1854 * It does not take into account the chronology, or calendar system.
1855 * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)},
1856 * but is the same approach as {@link ChronoLocalDateTime#timeLineOrder()}.
1857 *
1858 * @param other the other date-time to compare to, not null
1859 * @return true if this date-time is after the specified date-time
1860 */
1861 @Override // override for Javadoc and performance
1862 public boolean isAfter(ChronoLocalDateTime<?> other) {
1863 if (other instanceof LocalDateTime) {
1864 return compareTo0((LocalDateTime) other) > 0;
1865 }
1866 return ChronoLocalDateTime.super.isAfter(other);
1867 }
1868
1869 /**
1870 * Checks if this date-time is before the specified date-time.
1871 * <p>
1872 * This checks to see if this date-time represents a point on the
1873 * local time-line before the other date-time.
1874 * <pre>
1875 * LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
1876 * LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
1877 * a.isBefore(b) == true
1878 * a.isBefore(a) == false
1879 * b.isBefore(a) == false
1880 * </pre>
1881 * <p>
1882 * This method only considers the position of the two date-times on the local time-line.
1883 * It does not take into account the chronology, or calendar system.
1884 * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)},
1885 * but is the same approach as {@link ChronoLocalDateTime#timeLineOrder()}.
1886 *
1887 * @param other the other date-time to compare to, not null
1888 * @return true if this date-time is before the specified date-time
1889 */
1890 @Override // override for Javadoc and performance
1891 public boolean isBefore(ChronoLocalDateTime<?> other) {
1892 if (other instanceof LocalDateTime) {
1893 return compareTo0((LocalDateTime) other) < 0;
1894 }
1895 return ChronoLocalDateTime.super.isBefore(other);
1896 }
1897
1898 /**
1899 * Checks if this date-time is equal to the specified date-time.
1900 * <p>
1901 * This checks to see if this date-time represents the same point on the
1902 * local time-line as the other date-time.
1903 * <pre>
1904 * LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
1905 * LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
1906 * a.isEqual(b) == false
1907 * a.isEqual(a) == true
1908 * b.isEqual(a) == false
1909 * </pre>
1910 * <p>
1911 * This method only considers the position of the two date-times on the local time-line.
1912 * It does not take into account the chronology, or calendar system.
1913 * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)},
1914 * but is the same approach as {@link ChronoLocalDateTime#timeLineOrder()}.
1915 *
1916 * @param other the other date-time to compare to, not null
1917 * @return true if this date-time is equal to the specified date-time
1918 */
1919 @Override // override for Javadoc and performance
1920 public boolean isEqual(ChronoLocalDateTime<?> other) {
1921 if (other instanceof LocalDateTime) {
1922 return compareTo0((LocalDateTime) other) == 0;
1923 }
1924 return ChronoLocalDateTime.super.isEqual(other);
1925 }
1926
1927 //-----------------------------------------------------------------------
1928 /**
1929 * Checks if this date-time is equal to another date-time.
1930 * <p>
1931 * Compares this {@code LocalDateTime} with another ensuring that the date-time is the same.
1932 * Only objects of type {@code LocalDateTime} are compared, other types return false.
1933 *
1934 * @param obj the object to check, null returns false
1935 * @return true if this is equal to the other date-time
1936 */
1937 @Override
1938 public boolean equals(Object obj) {
1939 if (this == obj) {
1940 return true;
1941 }
1942 return (obj instanceof LocalDateTime other)
1943 && date.equals(other.date)
1944 && time.equals(other.time);
1945 }
1946
1947 /**
1948 * A hash code for this date-time.
1949 *
1950 * @return a suitable hash code
1951 */
1952 @Override
1953 public int hashCode() {
1954 return date.hashCode() ^ time.hashCode();
1955 }
1956
1957 //-----------------------------------------------------------------------
1958 /**
1959 * Outputs this date-time as a {@code String}, such as {@code 2007-12-03T10:15:30}.
1960 * <p>
1961 * The output will be one of the following ISO-8601 formats:
1962 * <ul>
1963 * <li>{@code uuuu-MM-dd'T'HH:mm}</li>
1964 * <li>{@code uuuu-MM-dd'T'HH:mm:ss}</li>
1965 * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSS}</li>
1966 * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSS}</li>
1967 * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSSSSS}</li>
1968 * </ul>
1969 * The format used will be the shortest that outputs the full value of
1970 * the time where the omitted parts are implied to be zero.
1971 *
1972 * @return a string representation of this date-time, not null
1973 */
1974 @Override
1975 public String toString() {
1976 var buf = new StringBuilder(29);
1977 formatTo(buf);
1978 return buf.toString();
1979 }
1980
1981 /**
1982 * Prints the toString result to the given buf, avoiding extra string allocations.
1983 */
1984 void formatTo(StringBuilder buf) {
1985 date.formatTo(buf);
1986 buf.append('T');
1987 time.formatTo(buf);
1988 }
1989
1990 //-----------------------------------------------------------------------
1991 /**
1992 * Writes the object using a
1993 * <a href="{@docRoot}/serialized-form.html#java.time.Ser">dedicated serialized form</a>.
1994 * @serialData
1995 * <pre>
1996 * out.writeByte(5); // identifies a LocalDateTime
1997 * // the <a href="{@docRoot}/serialized-form.html#java.time.LocalDate">date</a> excluding the one byte header
1998 * // the <a href="{@docRoot}/serialized-form.html#java.time.LocalTime">time</a> excluding the one byte header
1999 * </pre>
2000 *
2001 * @return the instance of {@code Ser}, not null
2002 */
2003 @java.io.Serial
2004 private Object writeReplace() {
2005 return new Ser(Ser.LOCAL_DATE_TIME_TYPE, this);
2006 }
2007
2008 /**
2009 * Defend against malicious streams.
2010 *
2011 * @param s the stream to read
2012 * @throws InvalidObjectException always
2013 */
2014 @java.io.Serial
2015 private void readObject(ObjectInputStream s) throws InvalidObjectException {
2016 throw new InvalidObjectException("Deserialization via serialization delegate");
2017 }
2018
2019 void writeExternal(DataOutput out) throws IOException {
2020 date.writeExternal(out);
2021 time.writeExternal(out);
2022 }
2023
2024 static LocalDateTime readExternal(DataInput in) throws IOException {
2025 LocalDate date = LocalDate.readExternal(in);
2026 LocalTime time = LocalTime.readExternal(in);
2027 return LocalDateTime.of(date, time);
2028 }
2029
2030 }