sqlserver获取当前日期的最大时间值

DECLARE @Date DATETIME = CURRENT_TIMESTAMP --当前系统日期时间

DECLARE @midnight DATETIME
SET @midnight = CAST(CAST(@Date AS DATE) AS DATETIME)
SELECT DATEADD(ms,-3,DATEADD(day,1,@midnight)) --2011-09-09 23:59:59.997