How to Convert a GMT Timestamp to GMT 13 in Java?

Converting Date/Time for a Specific Timezone in Java

You are looking to convert a GMT timestamp to GMT 13. While you have tried various combinations of Java date and time classes, you are facing challenges in setting the time and preserving the specified timezone.

Here's a comprehensive approach to solve your problem:

1. Set the Time on an Object:

   • Use the Calendar class to create a calendar instance (Calendar calendar = Calendar.getInstance()).
   • Set the time on the calendar object using calendar.setTime(new Date(1317816735000L)). This sets the time in milliseconds since the epoch.

2. Set the Timezone of the Initial Timestamp:

   • Avoid using calendar.setTimeZone() to set the timezone. It's better to use a date formatter and specify the timezone when converting the date to a string.

3. Format the Timestamp with a New Timezone:

   • Create a SimpleDateFormat object and set its timezone using formatter.setTimeZone(TimeZone.getTimeZone("GMT 13")).

4. Return a String with New Timezone Time:

   • Use formatter.format(calendar.getTime()) to convert the date to a string in the specified timezone.

For example:

Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date(1317816735000L));

DateFormat formatter = new SimpleDateFormat("dd MMM yyyy HH:mm:ss z");
formatter.setTimeZone(TimeZone.getTimeZone("GMT+13"));

String newZealandTime = formatter.format(calendar.getTime());

In the code above, the initial timestamp is set in milliseconds, and the SimpleDateFormat is used to format the date in "dd MMM yyyy HH:mm:ss z" format in the GMT 13 timezone.

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