Time Parser from millisecond

Question

Hi All,
How to parse a millisecond to a data format, such as hh:mm:ss.
I have a following code:
long start = System.currentTimeMillis();
//-- do some long task
long end = System.currentTimeMillis();
String elapsed = String.valueOf(end-start);
//then... how to convert to hh:mm:ssNow I want to parse the elapsedTime to the format of hh:mm:ss. I tried to use DateFormatter, but could not find a proper method for it.
Anyone has some experience on it? Could you drop me some line of code?
Many thanks.

Answer 1

Your problem is probably related to the fact that Dates are stored in a unversal time format, based on (as I recall) 0:00 GMT of 1st jan 1970.
Since you are in the states the Date/Time formatter routines, by default, will compensate for your local timezone (and also daylight saving time).
You could put Locale.UK in your DateDormat but you'd still have problems with daylight saving time.
Basically your problem is that the DateFormat is set up only to display actual dates and times, not intervals.
I think your best bet is to set up a Date with your local midnight (use Calendar and clear it), and add your time interval to that before formating.
Something like this should work:
static Data midNight;
static {
  Calendar cal = Calendar.getInstance();
  cal.clear();
  midNight = cal.getTime();
   String format = timeFormat.format(new Date(elapsed + midNight.getTime()));