获取某一日期所在月份的第一天日期或最后一天日期

获取指定日期所属月份的第一天日期:

 

set ansi_nulls on
go

set quoted_identifier on
go

-- =============================================
-- author:      insus.net
-- create date: 2019-05-09
-- update date: 2019-05-09
-- description: 获取指定日期所属月份的第一天日期
-- =============================================
alter function [dbo].[svf_firstdayofthemonth]
( 
    @thedate datetime 
)
returns datetime
as
begin
    return  dateadd(month,datediff(month,0,@thedate),0)  
end

go

 

获取指定日期所属月份的最后一天日期:

 

set ansi_nulls on
go
set quoted_identifier on
go
-- =============================================
-- author:      insus.net
-- create date: 2019-05-09
-- update date: 2019-05-09
-- description: 获取指定日期所属月份的最后一天日期
-- =============================================
create function [dbo].[svf_lastdayofthemonth] 
( 
    @thedate datetime 
)
returns datetime
as
begin
    return dateadd(day,-1,dateadd(month,datediff(month,0,@thedate) + 1,0))
end