How can I convert Java ZonedDateTime to OffsetDateTime with default time zone offset?

Question

Say I have a ZonedDateTime of 2018-10-30T18:04:58.874Z : How can I convert this to OffsetDateTime 2018-10-30T13:04:58.874-05:00

I'd prefer the offset to be the default/system offset, for example pulled from OffsetDateTime.now().

What methods of `ZonedDateTime` do you think can be useful here? — Sotirios Delimanolis, Oct 30 '18 at 19:44

score 12 · Accepted Answer · answered Oct 30 '18 at 19:45

From your ZonedDateTime you need to specify in which other zone you want your OffsetDateTime, precise the zone and them use .toOffsetDateTime() :

ZonedDateTime z = ZonedDateTime.parse("2018-10-30T18:04:58.874Z");
System.out.println(z); //2018-10-30T18:04:58.874Z

OffsetDateTime o = z.withZoneSameInstant(ZoneId.of("UTC-5")).toOffsetDateTime();
System.out.println(o); //2018-10-30T13:04:58.874-05:00

score 0 · Answer 2 · answered Oct 30 '18 at 19:46

0

This will shift the time zone from current/now:

someOffsetDateTime.withOffsetSameInstant(OffsetDateTime.now().getOffset())

answered Oct 30 '18 at 19:46

Greg

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This in general seems wrong to me: the offset can change if DST takes place and now() and tha actual date under parse can require different offsets – user1708042 Mar 28 '22 at 15:14

score 0 · Answer 3 · answered Mar 29 '22 at 06:50

I think the correct way to do it is as follows:

ZonedDateTime date = ZonedDateTime.parse("2018-10-30T18:04:58.874Z");
ZoneOffset offset = ZoneId.systemDefault().getRules().getOffset(date.toInstant());
ZonedDateTime dateInMyZone = date.withZoneSameInstant(offset)

getting it from now() will give you a possibly wrong result casue the offset can change during the year due to DST

How can I convert Java ZonedDateTime to OffsetDateTime with default time zone offset?

3 Answers3

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