Need help with Time
First I get the current time in milliseconds using:
System.currentTimeMillis()
Then I convert it to hh:mm:ss format using the following code:
public String millisecondsToString(long time)
{
int seconds = (int)((time/1000) % 60);
int minutes = (int)((time/60000) % 60);
int hours = (int)((time/3600000) % 24);
String secondsStr = (seconds<10 ? "0" : "")+seconds;
String minutesStr = (minutes<10 ? "0" : "")+minutes;
String hoursStr = (hours<10 ? "0" : "")+hours;
return hoursStr+":"+minutesStr+":"+secondsStr;
}
The minutes and seconds are correct, but the hour is 2 hours too slow.
Any ideas what I've done wrong?
Thanks:-)
Message was edited by:
paulinnorway
Probably you are not in the UTC Timezone...
the javadoc of System.currentTimeMillis says: "...Returns: the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC..."
I suggest using SimpleDateFormat or String.format to do the job:
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
String asString = sdf.format(new Date());
orString asString = String.format("%tT", System.currentTimeMillis());
[]
Thanks for the reply simu :-)
I'll have a look at those soon.
It seems like I get the correct time when I use a Date object and SimpleDateFormat, but when I use other methods I'm 2 hours behind.....odd.
Can anyone recomend a Class that is best for using time, especially one that allows you to increase/decrease the time by several minutes. At this stage of my Java leaning it seems like there limitations on each and also I find that it's hard to get things in the same "type". I've messed around with Date objects, Calendar objects, longs, and strings.......and I still don't know which is best to use.
Hopefully in a few days I'll have a better understanding of the "big picture" when using time, but at the moment I'm hoping someone can give me a point in the right direction.
> It seems like I get the correct time when I use a
> Date object and SimpleDateFormat, but when I use
> other methods I'm 2 hours behind.....odd.
well, as I (tryed) wrote before, you are probably not in a region using UTC, but currentTimeMillis is returned in UTC. Maybe you are in Europe? At least in Germany I got 2 hours behind = time diference to UTC (GMT).
Also have a look at java.util.Calendar
[]
I had a much closer look at Calendar and I had much more success with that.
I really liked CalendarObject.add(int field, int amount) for increasing the time by a certain amount.
I've changed the program to use mostly Calendar objects so I haven't had any problems with correct times any more.
Thanks again Simu for taking the time to give advice.
