Get last day of a given quarter and Year in SQL

Question

I have 2 variables year and quarter that I get from the view. I have to pass these values to get the last date of that particular Quarter and Year. Is there a way to do that in SQL?

For example:

select (QuarterEndDate) where Year = @year and Quarter = @quarter

Answer 1

I would use datefromparts() and eomonth() :

select eomonth(datefromparts(@year, 3 * @quarter, 1))

Demo on DB Fiddlde :

declare @year int;
declare @quarter int;

set @year = 2020;
set @quarter = 3;

select eomonth(datefromparts(@year, 3 * @quarter, 1)) last_quarter_day
GO

| last_quarter_day |
| :--------------- |
| 2020-09-30       |

Answer 2

Try the following, should give you the last date of the quarter.

first option: qq is your quarter number.

dateadd(qq, DateDiff(qq, 0, @Date), -1) 

second option:

dateadd(D,-1,dateadd(M, 3*qq+3, CONVERT(date, CONVERT(varchar(5),@year)+'-1-1')))