Change Java Timezone (not for an app, the whole server)

Question

My operating system is Windows Server 2012 R2

my server's time zone is UTC +3 İstanbul.

However when I run this code it gives me:

Venezuela Time America/Caracas

The code I run:

System.out.println(TimeZone.getDefault().getDisplayName());
System.out.println(TimeZone.getDefault().getID());

Where does JVM store default timezone information and how can I change it?

note:
the problem is not the code, I'm running Informatica on this server. I just placed the code to be an example. I want to change that info retrieved with TimeZone.getDefault().getDisplayName(). Where and How? My local clock is Turkey

Thanks

Answer 1

Pass the jvm the variable -Duser.timezone See How to set a JVM TimeZone Properly

Or see Oracle's reference on this topic https://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/time-zone002.html

Answer 2

if you use the TimeZone method, it will retrieve time from your local clock, instead of you could try to use the example below.

Instant now = Instant.now();
System.out.println(now);
ZonedDateTime dateTime = ZonedDateTime.ofInstant(
        now,
        ZoneId.of("Europe/Warsaw")
    );
System.out.println(dateTime);


LocalDate localDate = LocalDate.of(2017, Month.MARCH, 26);
LocalTime localTime = LocalTime.of(1, 0);
ZonedDateTime warsaw = ZonedDateTime.of(localDate, localTime, ZoneId.of("Europe/Warsaw"));
ZonedDateTime oneDayLater = warsaw.plusDays(1);
Duration duration = Duration.between(warsaw, oneDayLater);
System.out.println(duration);



LocalDate localDate = LocalDate.of(2017, Month.APRIL, 2);
LocalTime localTime = LocalTime.of(1, 0);
ZonedDateTime warsaw = ZonedDateTime.of(localDate, localTime, ZoneId.of("Australia/Sydney"));