java - Convert ZonedDatetime to String

Question

I am receiving JSON object containing a time in following format.

...
"start_time": "2020-12-30T17:30:00Z",
...

I've parsed it and assigned to ZonedDateTime

ZonedDateTime start_time = ZonedDateTime.parse(jsonObject.getString("start_time"));

Now I'd like to show it in String with users' device's local time zone.

I believe json time is in UTC zone. So users in Hongkong would see +8 offset, while users in Los Angeles would see -8 offset. So they would see as follows.

Users in HK: 2020-12-31 01:30

Users in LA: 2020-12-30 09:30

Answer 1

If those devices had configured the time zone correctly, you can use

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("YYYY-MM-dd HH:mm");
System.out.println(start_time.format(formatter.withZone(ZoneId.systemDefault())));

to get your result