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Calendar.HOUR for another timezone

ganesh gowthaman

Joined: Nov 25, 2009
Posts: 3
Hi there,




Current time is Thu Apr 22 16:18:25 EST 2010

But Calendar.HOUR_OF_DAY return 1
Looks like something to do with OFFSET, GMT...

I want to schedule a task when the clock strikes 10AM next.
I know i should use add or set of Calendar. But how to get the correct current hours?

Any help please?
Jesper de Jong
Java Cowboy
Saloon Keeper

Joined: Aug 16, 2005
Posts: 13867

ganesh gowthaman wrote:But Calendar.HOUR_OF_DAY return 1

You're not saying it explicitly, but I suspect that your code looks like this:

Note that that's not the correct way to use Calendar.HOUR_OF_DAY. In fact, HOUR_OF_DAY is a constant in class Calendar that you should pass to the get() method, for example:

So, HOUR_OF_DAY is not the actual hour, it's just a "label" that you can use with the get() method (and other methods).

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ganesh gowthaman

Joined: Nov 25, 2009
Posts: 3
I am sorry..

I meant

Calendar c = Calendar.getInstance(TimeZone.getTimeZone("EST"));

c.get(Calendar.HOUR_OF_DAY) returns 1 for the above scenario where the actual hour (as per the current timezone which is EST) is 16 and it returned 0 when the time was 15hours.

My question is what math will help me to get 16 from 1 or 15 from 0?

I hope i am clear!!!

Jesper de Jong
Java Cowboy
Saloon Keeper

Joined: Aug 16, 2005
Posts: 13867

Can you post the exact source code that you use to test this? I wrote this small program:

If I run this, I get:


Hour of day: 6

Note that in the long string I also see HOUR_OF_DAY=6, so that's consistent with what I get from cal.get(Calendar.HOUR_OF_DAY). (Note, the local time here is 13:52, so 6:52 in EST should be right).

If I look at your output, in the long line I also see HOUR_OF_DAY=1 so it looks right that get(Calendar.HOUR_OF_DAY) returns 1 for your case.
I agree. Here's the link:
subject: Calendar.HOUR for another timezone
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