计算指定年月的最后一天的自定义函数
2024-07-21 02:06:43
供稿：网友
/*
name : fun_yiyuedezuihouyitian
function : 根据传入的格式如“200311”的年月值计算出当月的最后一天
parameters :
benyue 本月
type : char(6)
format : "200311"
returnvalue :
格式如“200310”的年月值
type : char(6)
steps :
author : waxdoll cheung
date : 2004-04-04
*/
create function dbo.fun_yiyuedezuihouyitian
(
@benyue char(6)
)
returns char(10)
as
begin
declare @returnvalue char(2)
declare @yuefen char(2)
declare @nianfen char(4)
set @yuefen = right(@benyue, 2)
set @nianfen = left(@benyue, 4)
if @yuefen in ('01', '03', '05', '07', '08', '10', '12')
begin
set @returnvalue = '31'
end
if @yuefen in ('04', '06', '09', '11')
begin
set @returnvalue = '30'
end
if @yuefen = '02'
begin
if ((@nianfen % 4 = 0 and @nianfen % 100 <> 0) or (@nianfen % 400 = 0))
begin
set @returnvalue = '29'
end
else
begin
set @returnvalue = '28'
end
end
return @nianfen + '-' + @yuefen + '-' + @returnvalue
end
