CODEWITHSUNDEEP
javajava-time
David Thielen
David Thielen

Reputation: 32926

OffsetDateTime to ZonedDateTime - with specific ZoneId

We have a DateTime class we created to hold a datetime in our library. The value generally comes from a SQL database (so UTC) or XML (can have an offset). But it can also be a datetime with an explicit timezone (like Denver).

Inside our class we hold this as an OffsetDateTime which I think is best because 98% of the time we're getting an explicit instant with a known offset, and no zone.

When it is initialized with a ZonedDateTime, I'm thinking we save it as an OffsetDateTime and save the ZoneId. Then, only for the case where we want a ZonedDateTime object (converting to a string for display), if we have the ZoneId, apply it to OffsetDateTime.toZonedDateTime(). That way we get "MST" instead of "-0700" for the 'z' value in displaying as a string.

How can I create a ZonedDateTime with a specific ZoneId from an OffsetDateTime?

Upvotes: 2

Views: 7921

Answers (1)

Laksitha Ranasingha
Laksitha Ranasingha

Reputation: 4507

A solution to the specific question you have asked; 

ZoneId mst = ZoneId.ofOffset("UTC", ZoneOffset.ofHours(-7));
OffsetDateTime mstOffsetDateTime = OffsetDateTime.now(mst);
ZonedDateTime mstZonedDateTime = mstOffsetDateTime.atZoneSameInstant(mst);

However, I am not sure why you want to save your timestamp in OffsetDateTime. If you keep track of your ZoneId, you could save timestamp in UTC and convert to any format as you wish in backend/frontend (or any other client). Storing datetime as UTC would give you more flexibility.

Upvotes: 2

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