cvs diff -u
And the most efficient way is to open up an enhancement entry in Bugzilla and attach the patch there. That way it won't get lost in the mix.
Inger, Matthew wrote:
If i can figure out how to do the patch. is it diff -n
?????
Then do i just post the diff along with the test diff to the newsgroup?
-----Original Message----- From: Stephen Colebourne [mailto:[EMAIL PROTECTED] Sent: Monday, November 24, 2003 6:12 PM To: Jakarta Commons Developers List Subject: Re: [lang] possible DateUtils method
I think this would make a good addition to DateUtils. Would you like to provide a patch and tests?
Stephen
----- Original Message ----- From: "Inger, Matthew" <[EMAIL PROTECTED]>
public static final long MILLIS_IN_DAY = 1000*60*60*24;
public long getDaysBetween(Calendar c1, Calendar c2) { long c1Normalized = c1.getTime().getTime() + c1.get(Calendar.ZONE_OFFSET) + c1.get(Calendar.DST_OFFSET);
long c2Normalized = c2.getTime().getTime() + c2.get(Calendar.ZONE_OFFSET) + c2.get(Calendar.DST_OFFSET);
long diff = c1Normalized - c2Normalized;
long numDays = diff / MILLIS_IN_DAY;
return numDays; }
A common mistake most people make is to ignore daylight savings time when trying to compute the number of days between two Calendar dates. If you cross the DST boundary when the clock jumps forward, just subtracting the date objects and dividing will end up giving you an answer that is off by 1 day. This happens because the clock jumps ahead, and 00:00 EDT is actually 11:00 EST on the previous day, so the number of hours is off by 1, and thus the calculation doesn't end up
working
properly. The other thing i'm doing here is to convert to GMT time, allowing for the two Calendar objects to have different timezones.
We could have similar methods for getHoursBetween and so forth. Months would be a bit more complicated of an algorithm.
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