The snippet library.

JavaDates & time zones

Check the Gregorian leap-year rule ↗

Java: Use Year.isLeap rather than checking divisibility by four alone.

Java✓ Tested

JavaDates & time zones

Convert an instant to a regional timezone ↗

Java: Use ZonedDateTime with a named zone to apply that zone’s offset rules.

Java✓ Tested

JavaDates & time zones

Convert epoch seconds into an instant ↗

Java: Instant represents a UTC timeline point independent of the default timezone.

Java✓ Tested

JavaDates & time zones

Count days between two dates ↗

Java: Use ChronoUnit.DAYS for an elapsed count rather than a Period day component.

Java✓ Tested

JavaDates & time zones

Find the last day of a month ↗

Java: Use YearMonth so leap years and month lengths are handled by the calendar library.

Java✓ Tested

JavaDates & time zones

Find the next chosen weekday ↗

Java: TemporalAdjusters.next excludes the starting day even if it already has that weekday.

Java✓ Tested

JavaDates & time zones

Generate a half-open range of dates ↗

Java: datesUntil includes the starting date and excludes the end date.

Java✓ Tested

JavaDates & time zones

Measure a duration between instants ↗

Java: Use Duration for elapsed timeline time and retrieve total seconds.

Java✓ Tested

JavaDates & time zones

Parse a date with an explicit input pattern ↗

Java: Use DateTimeFormatter for a non-ISO date representation.

Java✓ Tested

JavaDates & time zones

Read an ISO week year and week number ↗

Java: Use ISO week fields together because a week can belong to the previous calendar year.

Java✓ Tested