Milliseconds to Date in GMT in Java

Question

I need to covert milliseconds to GMT date (in Android app), example:

1372916493000

When I convert it by this code:

Calendar cal          


        

Answer 1

It seemed you were messed up with your home timezone and the UTC timezone during the conversion.

Let's assume you are in London (currently London has 1 hour ahead of GMT) and the milliseconds is the time in your home timezone (in this case, London).

Then, you probably should:

Calendar cal = Calendar.getInstance();
// Via this, you're setting the timezone for the time you're planning to do the conversion
cal.setTimeZone(TimeZone.getTimeZone("Europe/London"));
cal.setTimeInMillis(1372916493000L);
// The date is in your home timezone (London, in this case)
Date date = cal.getTime();


TimeZone destTz = TimeZone.getTimeZone("GMT");
// Best practice is to set Locale in case of messing up the date display
SimpleDateFormat destFormat = new SimpleDateFormat("HH:mm MM/dd/yyyy", Locale.US);
destFormat.setTimeZone(destTz);
// Then we do the conversion to convert the date you provided in milliseconds to the GMT timezone
String convertResult = destFormat.parse(date);

Please let me know if I correctly get your point?

Cheers