Comments on: Find # days between 2 dates in Query 400 http://itknowledgeexchange.techtarget.com/itanswers/find-sharp-days-between-2-dates-in-query-400-2/ Wed, 22 May 2013 02:14:48 +0000 hourly 1 By: rosshowatson http://itknowledgeexchange.techtarget.com/itanswers/find-sharp-days-between-2-dates-in-query-400-2/#comment-76400 rosshowatson Fri, 23 Apr 2010 14:45:01 +0000 #comment-76400 If the fields are defined as character then convert the date field to a YYYY-MM-DD format (include the – symbol) via a Define Result Fields as follows:
OLDESTCHR1 substr(chr1,1,4) || ‘-’ ||
substr(chr1,5,2) || ‘-’ ||
substr(chr1,7,2)
(change the start positions accordingly).
Do the above for both date fields.
DATECHRDIF date(OLDESTCHR2) –
date(OLDESTCHR1)

This will give you the number of days between two dates (0 days when dates are the same).

If the fields are already defined as date (in YYYY-MM-DD format) then the formula is as follows:
DATEDIFF DateField2 – DateField1

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