如何仅将日期时间转换为日期(时间设置为00:00:00.000)

Question

我有一个字符串'2009-06-24 09:52:43.000',我需要将其插入到表的DateTime列中.

但是我不在乎时间,只想插入它作为2009-06-24 00:00:00.000

我怎么能在T-SQL中做到这一点？

Answer 1

对于SQL Server 2005及更低版本:

CONVERT(varchar(8), @ParamDate, 112)    -- Supported way

CAST(FLOOR(CAST(@ParamDate AS float)) AS DATETIME)   -- Unsupported way

对于SQL Server 2008及更高版本:

CAST(@ParamDate AS DATE)

Answer 2

declare @originalDate datetime
select @originalDate = '2009-06-24 09:52:43.000'

declare @withoutTime datetime
select @withoutTime = dateadd(d, datediff(d, 0, @originalDate), 0)

select @withoutTime

Answer 3

SELECT CAST(CONVERT(VARCHAR,GETDATE(),102) AS DATETIME)

SELECT CAST(CONVERT(VARCHAR(10),'2009-06-24 09:52:43.000',102) AS DATETIME)

Answer 4

我发现将日期转换为日期，然后转换为日期时间非常有效和直观。

 SELECT CAST(CAST(GETDATE() as date) as datetime)