sqlserver中获取当前日期的午夜的时间值的实现方

MidnightOf
ALTER FUNCTION [dbo].[MidnightOf] (
@Date DATETIME
) RETURNS DATETIME
AS
BEGIN
RETURN (dateadd(year,(datepart(year,@Date) - 2000),dateadd(month,(datepart(month,@Date) - 1),dateadd(day,(datepart(day,@Date) - 1),'2000'))))
END

SELECT DATEADD(day,DATEDIFF(day,'20010101',CURRENT_TIMESTAMP),'20010101');

SELECT CAST((CAST(CAST(CURRENT_TIMESTAMP AS DATE) AS CHAR(10)) + ' ' + '00:00:00.000') AS DATETIME)

SELECT CAST(CAST(CURRENT_TIMESTAMP AS DATE) AS DATETIME)