Java 8 Convert given time and time zone to UTC time

Question

I have a time with string type like: "2015-01-05 17:00" and ZoneId is "Australia/Sydney".

How can I convert this time information to the corresponding to UTC time using Java 8 datetime API?

Also need to considering DST stuff.

Answer 1

You are looking for ZonedDateTime class in Java8 - a complete date-time with time-zone and resolved offset from UTC/Greenwich. In terms of design, this class should be viewed primarily as the combination of a LocalDateTime and a ZoneId. The ZoneOffset is a vital, but secondary, piece of information, used to ensure that the class represents an instant, especially during a daylight savings overlap.

For example:

ZoneId australia = ZoneId.of("Australia/Sydney"); String str = "2015-01-05 17:00"; DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm"); LocalDateTime localtDateAndTime = LocalDateTime.parse(str, formatter); ZonedDateTime dateAndTimeInSydney = ZonedDateTime.of(localtDateAndTime, australia );  System.out.println("Current date and time in a particular timezone : " + dateAndTimeInSydney);  ZonedDateTime utcDate = dateAndTimeInSydney.withZoneSameInstant(ZoneOffset.UTC);  System.out.println("Current date and time in UTC : " + utcDate); 

Answer 2

An alternative to the existing answer is to setup the formatter with the appropriate time zone:

String input = "2015-01-05 17:00";
ZoneId zone = ZoneId.of("Australia/Sydney");

DateTimeFormatter fmt = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm").withZone(zone);
ZonedDateTime utc = ZonedDateTime.parse(input, fmt).withZoneSameInstant(UTC);

Since you want to interact with a database, you may need a java.sql.Timestamp, in which case you don't need to explicitly convert to a UTC time but can use an Instant instead:

ZonedDateTime zdt = ZonedDateTime.parse(input, fmt);
Timestamp sqlTs = Timestamp.from(zdt.toInstant());