Question

Any idea how to build datediff query that calculate time that possibly crosses midnight?

Of course, if that is one case, I would calculate separately part to and from midnight, but I need universal query, because I have thousands of rows, where some of them crosses midnight, and some not, and for every one of them I have to calc. datediff (which is up to 10 minutes, can’t cross 2 days for that matter).

Answer 1

The DATEDIFF function handles both cases.

SELECT DATEDIFF(MINUTE, '2011-12-20 11:43:00', '2011-12-20 11:50:00')
SELECT DATEDIFF(MINUTE, '2011-12-20 23:59:00', '2011-12-21 00:07:00')