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# Difference between 2 dates

Posted on 2004-04-15
Medium Priority
156 Views
I have seen most of the solutions found here.  But I am having trouble with the calulation of the number of days when using 04/01/2004 to 04/30/2004 is calculating 29 days instead of 30.  But when I use something like 04/01/2004 - 04/03/2004 it is calcualting 3 days which is correct.  Also it is correct when I use 4/5/2004 - 04/30/2004.  it appears to only give an incorrect number when I use a start date from standard time and a end date from daylight savings time.

Anyone else experience this?

I am using the difference in milliseconds, diffMilli/(24*60*60*1000).

thanks,

Jim
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Question by:jrmc_97
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LVL 37

Accepted Solution

zzynx earned 252 total points
ID: 10836070
I think this will work (UTC doesn't use daylight saving stuff):

Calendar c = Calendar.getInstance("UTC");
c.set(2004, 4, 1);
long l1 = c.getTimeInMillis();
c.set(2004, 4, 3);
long l2 = c.getTimeInMillis();
long difference = l2-l1;
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LVL 86

Assisted Solution

CEHJ earned 248 total points
ID: 10836159
>>Calendar c = Calendar.getInstance("UTC");

should be

Calendar c = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
0

LVL 92

Expert Comment

ID: 10837798
Depends what your definition of the number of days between two dates is.
0

LVL 30

Expert Comment

ID: 10839446
>> I am using the difference in milliseconds, diffMilli/(24*60*60*1000).

Shouldn't do that. Java has all the API you need for dates.
0

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