Calculate minutes between times

> I'm not thinking Calendar's going to be a lot of help

> here.

Not sure if I understand you. Did you say that because it is a abstract class? I meant for the OP to use the concrete implementation, of course (being the GregorianCalendar which is mentioned in your second reference).

prometheuzza at 2007-7-12 17:28:23 >

> ...

> No, I meant in general. Of course, my head might

> just be stuffed with sawdust and rat droppings. Now

> that I think about it, doens't dubwai's most

> excellent elapsed days algorithm use Calendar? I

> guess that could be adapted for elapsed minutes.

If you're talking about the one that works for "modern" dates, then the answer is yes.

> If we ignore leap seconds though, shouldn't a simple

> millis delta / 60,000 be sufficient?

That was my thought as well.

prometheuzza at 2007-7-12 17:28:23 >

> > ...

> > No, I meant in general. Of course, my head might

> > just be stuffed with sawdust and rat droppings.

> Now

> > that I think about it, doens't dubwai's most

> > excellent elapsed days algorithm use Calendar? I

> > guess that could be adapted for elapsed minutes.

>

> If you're talking about the one that works for

> "modern" dates, then the answer is yes.

I've only seen one, but yeah, I guess that's it.

jverda at 2007-7-12 17:28:23 >

> [url=http://www.javaworld.com/javaworld/jw-03-2001/jw-0330-time.html?page=1]Working in Java time: Learn the

> basics of calculating elapsed time in Java[/url]

This already helped me a lot, thanks a lot!

I am using the following code to get the current time:

private Date timeAtStartDate = new Date(System.currentTimeMillis());

private SimpleDateFormat timeFormat = new SimpleDateFormat("Hmm");

private String timeAtStartString = timeFormat.format(timeAtStartDate);

The example from JavaWorld (see link above, page 2) uses GregorianCalendar, e.g.:

GregorianCalendar lunarLanding = new GregorianCalendar(1969, Calendar.JULY, 20, 16, 17);

It's not necessary for me to calculate with days, months or even years. Hours and minutes are sufficient :) I don't know how I can get the current time in the GregorianCalendar format so that I can work with the example given at JavaWorld...

SFLa at 2007-7-12 17:28:23 >

Oh, seems I was a little distracted by the long introductory example in the java.util.GregorianCalendar API. I am sorry!

Edit: I changed my code and I am now doing the following; first I retrieve the time when the application starts:

private GregorianCalendar timeAtStart = new GregorianCalendar();

int hour24AtStart = timeAtStart.get(Calendar.HOUR_OF_DAY);

int minAtStart = timeAtStart.get(Calendar.MINUTE);

Then I wrote a method with which I calculate the elapsed time:

private String getElapsedTime() {

GregorianCalendar timeNow = new GregorianCalendar();

long diffMillis = timeNow.getTimeInMillis() - timeAtStart.getTimeInMillis();

long diffSecs = diffMillis / 1000;

long diffMins = diffMillis / (60 * 1000);

return (diffMins+":"+diffSecs);

}

I found an example at http://www.exampledepot.com/egs/java.util/CompDates.html; the problem is, that the seconds are counted endlessly - can I change this somehow so that they are being counted only up to 60 seconds and start then new at zero?

SFLa at 2007-7-12 17:28:23 >