Get next 1st thursday

CREATE FUNCTION dbo.Getnext1stthursday(@currentDate DATETIME)
RETURNS DATETIME
AS
 BEGIN
 DECLARE @1stThurs DATETIME;
 DECLARE @daysToAdd INT = CASE
 WHEN ( 5 - Datepart(weekday, Dateadd(DD, 1 - Day(@currentDate), @currentDate)) ) < 0 THEN --Thursday Passed 
 7 + ( 5 - Datepart(weekday, Dateadd(DD, 1 - Day(@currentDate), @currentDate)) )
 ELSE ( 5 - Datepart(weekday, Dateadd(DD, 1 - Day(@currentDate), @currentDate)) )
 END

 SET @1stThurs = CONVERT(DATE, Dateadd(dd, @daysToAdd, Dateadd(DD, 1 - Day(@currentDate), @currentDate)));

 RETURN CASE
 WHEN @1stThurs < @currentDate THEN dbo.Getnext1stthursday(Dateadd(DD, 1 - Day(Dateadd(mm, 1, @currentDate)), Dateadd(mm, 1, @currentDate)))
 ELSE @1stThurs
 END;
 END