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mssql中获取指定日期所在月份的第一天的代码 - 站长搜索
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mssql中获取指定日期所在月份的第一天的代码

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2022-09-23 20:29:08 转载来源: 网络整理/侵权必删

获取指定日期月份的第一天,你可以使用DATEADD函数,减去指定日期的月份过去了的天数,即可。复制代码代码如下:CREATEFUNCTION[dbo].[udf_FirstDayOfMonth](@DateDATE)RETURNSDATETIMEASBEGINRETURNCAST(DATEADD(day,1-DAY(@Date),@Date)ASDATETIME)END或者,用DATEDIFF计算指定日期与日期开始之时,相隔几个月,然后再DATEADD加上这个相隔月份数,从零开始

获取指定日期月份第一天,你可以使用DATEADD函数,减去指定日期的月份过去了的天数,即可。
复制代码 代码如下:

CREATE FUNCTION [dbo].[udf_FirstDayOfMonth]
(
@Date DATE
)
RETURNS DATETIME
AS
BEGIN
RETURN CAST(DATEADD(day,1 - DAY(@Date), @Date) AS DATETIME)
END

或者,用DATEDIFF计算指定日期与日期开始之时,相隔几个月,然后再DATEADD加上这个相隔月份数,从零开始。
复制代码 代码如下:

CREATE FUNCTION [dbo].[udf_FirstDayOfMonth]
(
@Date DATE
)
RETURNS DATETIME
AS
BEGIN
RETURN DATEADD(MONTH,DATEDIFF(MONTH,0,@Date),0)
END

或者,从指定的日期取出年或月,然后与01组合为日期,即得到指定日期当月天第一天。
复制代码 代码如下:

CREATE FUNCTION [dbo].[udf_FirstDayOfMonth]
(
@Date DATE
)
RETURNS DATETIME
AS
BEGIN
DECLARE @y NVARCHAR(4) = CAST(YEAR(@Date) AS NVARCHAR(4))
DECLARE @m NVARCHAR(2) = CAST(MONTH(@Date) AS NVARCHAR(2))
RETURN CAST((@y + N'-' + @m + N'-01') AS DATETIME)
END

或者,参考这篇:https://www.jb51.net/article/23285.htm 使用CONVERT函数,指定日期格式来转换,这样也可以获取指定日期所在月份的第一天。
复制代码 代码如下:

CREATE FUNCTION [dbo].[udf_FirstDayOfMonth]
(
@Date DATE
)
RETURNS DATETIME
AS
BEGIN
DECLARE @ym NVARCHAR(10) = CONVERT(varchar(8),GETDATE(),23)
RETURN CAST((@ym + N'01') AS DATETIME)
END

标签: mssql 获取 指定 日期 所在 月份 第一天 代码


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