写了2个自定义函数，获取指定日期所在年份的第一天日期或最后一天的日期：
set ansi_nulls on
go
set quoted_identifier on
go
-- =============================================
-- author: insus.net
-- create date: 2019-05-09
-- update date: 2019-05-09
-- description: 获取指定日期所属年份的第一天日期
-- =============================================
create function [dbo].[svf_firstdateoftheyear]
(
@theyear datetime
)
returns datetime
as
begin
return dateadd(year,datediff(year,0,@theyear),0)
end
go
set ansi_nulls on
go
set quoted_identifier on
go
-- =============================================
-- author: insus.net
-- create date: 2019-05-09
-- update date: 2019-05-09
-- description: 获取指定日期所属年份的最后一天日期
-- =============================================
create function [dbo].[svf_lastdateoftheyear]
(
@theyear datetime
)
returns datetime
as
begin
return dateadd(day,-1,dateadd(year,datediff(year,0,@theyear) + 1,0))
end
go
举例说明：