Mysql Timediff
SET @date1 = '2010-10-11 00:00:00', @date2 = '2010-10-10 00:00:00';
SELECT
TIMEDIFF(@date1, @date2) AS 'TIMEDIFF',
TIMESTAMPDIFF(hour, @date1, @date2) AS 'TIMESTAMPDIFF';
Fierce Fish