Android Noob Android Noob - 1 year ago 105
Java Question

Java: How do you convert a UTC timestamp to local time?

I have a timestamp that's in UTC and I want to convert it to local time without using an API call like

. How exactly are you supposed to do this? I've been using the following code without much success:

private static final SimpleDateFormat mSegmentStartTimeFormatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS");

Calendar calendar = Calendar.getInstance();

try {
catch (ParseException e) {

return calendar.getTimeInMillis();

Sample input value:

should return the equivalent of

Answer Source

Date has no timezone and internally stores in UTC. Only when a date is formatted is the timezone correction applies. When using a DateFormat, it defaults to the timezone of the JVM it's running in. Use setTimeZone to change it as necessary.

DateFormat utcFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");

Date date = utcFormat.parse("2012-08-15T22:56:02.038Z");

DateFormat pstFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS");


This prints 2012-08-15T15:56:02.038

Note that I left out the 'Z' in the PST format as it indicates UTC. If you just went with Z then the output would be 2012-08-15T15:56:02.038-0700

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