--计算给定日期所在季度的天数
declare @date datetime;
set @date = getdate()
--本季度第一天与下季度第一天所差的天数
select datediff(day,dateadd(quarter,datediff(quarter,0,@date),0),dateadd(quarter,1+datediff(quarter,0,@date),0))
--借助变量简化
select @date = dateadd(quarter,datediff(quarter,0,@date),0) --本季度第一天
select datediff(day,@date,dateadd(quarter,1,@date))
go
