java.time

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1. Getting the Current Date and Time

LocalDateTime now = LocalDateTime.now();
System.out.println(now);

2. Creating a Specific Date and Time

LocalDate birthDate = LocalDate.of(1980, 1, 1);
LocalTime birthTime = LocalTime.of(12, 30);
LocalDateTime birthDateTime = LocalDateTime.of(birthDate, birthTime);

3. Adding and Subtracting Time

LocalDateTime now = LocalDateTime.now();
LocalDateTime later = now.plusHours(2);
LocalDateTime earlier = now.minusMinutes(30);

4. Comparing Dates and Times

LocalDate date1 = LocalDate.of(2023, 3, 8);
LocalDate date2 = LocalDate.of(2023, 3, 10);
boolean isDate1BeforeDate2 = date1.isBefore(date2);

5. Parsing and Formatting Dates and Times

String dateString = "2023-03-08";
LocalDate date = LocalDate.parse(dateString);

String formattedDateString = date.format(DateTimeFormatter.ofPattern("dd/MM/yyyy"));

6. Converting Between Time Zones

ZoneId fromZone = ZoneId.of("Europe/Paris");
ZoneId toZone = ZoneId.of("America/New_York");
ZonedDateTime fromDateTime = ZonedDateTime.now(fromZone);
ZonedDateTime toDateTime = fromDateTime.withZoneSameInstant(toZone);

7. Calculating Differences Between Dates and Times

LocalDate date1 = LocalDate.of(2023, 3, 8);
LocalDate date2 = LocalDate.of(2023, 3, 10);
Period period = Period.between(date1, date2);
int daysBetween = period.getDays();

8. Getting Weekday and Day of Year

LocalDate date = LocalDate.of(2023, 3, 8);
DayOfWeek dayOfWeek = date.getDayOfWeek();
int dayOfYear = date.getDayOfYear();

9. Checking for Temporal Validity

LocalDate invalidDate = LocalDate.of(2023, 2, 30); // February only has 28 days in a non-leap year
boolean isValid = invalidDate.isValid();

10. Creating Time Ranges

LocalDateTime startDateTime = LocalDateTime.of(2023, 3, 8, 12, 0);
LocalDateTime endDateTime = LocalDateTime.of(2023, 3, 8, 14, 0);
Duration duration = Duration.between(startDateTime, endDateTime);

11. Converting to and from Epoch Time

long epochTime = Instant.now().getEpochSecond();
LocalDateTime dateTime = LocalDateTime.ofEpochSecond(epochTime, 0, ZoneOffset.UTC);

12. Managing Daylight Saving Time (DST)

LocalDateTime nonDST = LocalDateTime.of(2023, 1, 1, 12, 0);
LocalDateTime DST = LocalDateTime.of(2023, 7, 1, 12, 0);
boolean isDST = DST.isAfter(nonDST);

13. Creating TimeStamp

Instant instant = Instant.now();
long timestamp = instant.toEpochMilli();

14. Creating Timer Schedules

ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(1);
ScheduledFuture<?> scheduledFuture = executor.schedule(() -> {
    // Task to be executed
}, 5, TimeUnit.SECONDS);

15. Getting Today's Date

LocalDate today = LocalDate.now(ZoneId.systemDefault());

16. Getting Month Value

LocalDate date = LocalDate.of(2023, 3, 8);
int monthValue = date.getMonthValue(); // 3

17. Creating Interval

LocalDate startDate = LocalDate.of(2023, 3, 1);
LocalDate endDate = LocalDate.of(2023, 3, 31);
Interval interval = Interval.of(startDate, endDate);

18. Getting Year

LocalDate date = LocalDate.of(2023, 3, 8);
int year = date.getYear(); // 2023

19. Getting Day Value

LocalDate date = LocalDate.of(2023, 3, 8);
int dayValue = date.getDayOfMonth(); // 8

20. Checking if Year is Leap Year

LocalDate date = LocalDate.of(2023, 3, 8);
boolean isLeapYear = date.isLeapYear();

21. Getting Time Zone

ZonedDateTime zonedDateTime = ZonedDateTime.now();
ZoneId timeZone = zonedDateTime.getZone();

22. Getting Offset from UTC

ZonedDateTime zonedDateTime = ZonedDateTime.now();
ZoneOffset offset = zonedDateTime.getOffset();

23. Creating Duration

Duration duration = Duration.ofHours(2);

24. Adding Duration to Instant

Instant instant = Instant.now();
Instant later = instant.plus(Duration.ofHours(2));

25. Calculating Duration Between Two Instants

Instant start = Instant.now();
Instant end = Instant.now().plusSeconds(30);
Duration duration = Duration.between(start, end);

26. Creating Period

Period period = Period.ofMonths(2);

27. Adding Period to LocalDate

LocalDate date = LocalDate.now();
LocalDate later = date.plus(Period.ofMonths(2));

28. Calculating Period Between Two LocalDates

LocalDate start = LocalDate.of(2023, 3, 8);
LocalDate end = LocalDate.of(2023, 5, 8);
Period period = Period.between(start, end);

29. Creating OffsetDateTime

OffsetDateTime offsetDateTime = OffsetDateTime.now();

30. Getting Offset

OffsetDateTime offsetDateTime = OffsetDateTime.now();
ZonedDateTime zonedDateTime = offsetDateTime.toZonedDateTime();
ZoneOffset offset = zonedDateTime.getOffset();

31. Creating ZoneId

ZoneId zoneId = ZoneId.of("America/Los_Angeles");

32. Creating ZoneDateTime

ZonedDateTime zonedDateTime = ZonedDateTime.now();

33. Creating Duration from Nanoseconds

Duration duration = Duration.ofNanos(3000000000L);

34. Creating Duration from Milliseconds

Duration duration = Duration.ofMillis(3000);

35. Calculating Duration Between Two LocalDateTime

LocalDateTime start = LocalDateTime.of(2023, 3, 8, 12, 0);
LocalDateTime end = LocalDateTime.of(2023, 3, 8, 14, 0);
Duration duration = Duration.between(start, end);

36. Converting LocalDateTime to Epoch Seconds