Java 8 ZoneOffset - How to get current system UTC offset

Question

I want to get current ZoneOffset of my system.
I tried to do that but I couldn't find a way.
Also, I was looking for a solution but I didn't find any.
Is it possible to do that in Java?

EDIT:
My question is different to this. I would like to know the current system UTC, not how to convert between TimeZone offset representation or TimeZone storing.

Answer 1

Your request has two parts:

• the offset of "my system" - thus you need the system time-zone - ZoneId.systemDefault()
• the "current" offset - thus you need the current instant - Instant.now()

These are tied together using ZoneRules, to get the following:

ZoneOffset o = ZoneId.systemDefault().getRules().getOffset(Instant.now());

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For simplicty, you might want to use OffsetDateTime:

ZoneOffset o = OffsetDateTime.now().getOffset();

This works because OffsetDateTime.now() uses both ZoneId.systemDefault() and Instant.now() internally.

Answer 2

Yes, it's possible:

ZoneOffset.systemDefault().getRules().getOffset(Instant.now())

or you can replace Instant instance with LocalDateTime instance:

ZoneOffset.systemDefault().getRules().getOffset(LocalDateTime.now())