2010-06-21 00:00:00.000 SELECT dateadd(ms,0,DATEADD(dd, DATEDIFF(dd,0,getdate()), 0)) 2010-06-21 23:59:59.997 SELECT dateadd(ms,-3,DATEADD(dd, DATEDIFF(dd,-1,getdate()), 0)) ms步频是3 当月第一天 SELECT DATEADD(mm, DATEDIFF(mm,0,getdate()), 0) 当月最后一天 SELECT …