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By Gordon Klundt,
This function takes a date and a date part parameter and rounds the date down to the nearest date part.
Example:In order to round '2010-11-03 17:44:10.117' to the nearest hour ('2010-11-03 17:00:00.000')select dbo.datefloor(cast('2010-11-03 17:44:10.117' as datetime),'hh')
This function is helpful when aggregating dates by a date part (hour, day, etc).See also: DateCeiling Function
Rounds dates up to the nearest datepart.