4/17/2023 0 Comments Java get utc timeAnd search Stack Overflow for many examples and explanations. These classes supplant the troublesome old legacy date-time classes such as, Calendar, & SimpleDateFormat. The java.time framework is built into Java 8 and later. Similarly, look for new methods added to GregorianCalendar (subclass of Calendar) to convert to and from. utilDate = ( instant ) Īnd going the other direction. While you should avoid the old date-time classes, if you must you can convert using new methods added to the old classes. ZoneId z = ZoneId.of( "America/Montreal" ) Instant and the ZonedDateTime both represent the very same simultaneous moment, just viewed through two different lenses. So note how the time-of-day is four hours earlier in the output, 15 instead of 19 hours. In the summer, under Daylight Saving Time (DST) nonsense, the zone has an offset of -04:00. In this example we apply Montréal time zone. When you want to display wall-clock time for some particular time zone, apply a ZoneId to get a ZonedDateTime. Search Stack Overflow for many examples of using DateTimeFormatter. Now with an OffsetDateTime object in hand, you can use DateTimeFormatter to create String objects with text in alternate formats. OffsetDateTime odt = instant.atOffset( ZoneOffset.UTC ) Here we want to stick with UTC (+00) so we can use the convenient constant ZoneOffset.UTC. In java.time that means a ZoneOffset object. For more flexibility, convert from Instant to OffsetDateTime. OffsetDateTimeīut Instant has limitations such as no formatting options for generating strings in alternate formats. This should be your go-to class when handling date-time as generally the best practice is to track, store, and exchange date-time values in UTC. ![]() The Instant class is a basic building-block class in java.time. The toString method generates a String object with text representing the date-time value using one of the standard ISO 8601 formats. InstantĪn Instant represents a moment on the timeline in UTC with a resolution of up to nanoseconds. Much of the functionality has been back-ported to Java 6 & 7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP. The troublesome old date-time classes bundled with the earliest versions of Java have been supplanted by the java.time classes built into Java 8 and later. ![]() Long epochMillis = utc.toInstant().toEpochMilli() To answer your comment, you can then convert it to a Date (unless you depend on legacy code I don't see any reason why) or to millis since the epochs: Date date = om(utc.toInstant()) With Java 8 you can write: OffsetDateTime utc = OffsetDateTime.now(ZoneOffset.UTC)
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