Add business days to date in SQL without loops

Question

I currently have a function in my SQL database that adds a certain amount of business days to a date, e.g. if you enter a date that is a Thursday and add two days, it will r

Answer 1

I found a much more elegant approach from Microsoft Docs. It takes into account skipping multiple weekends. Super clean.

CREATE FUNCTION DAYSADDNOWK(@addDate AS DATE, @numDays AS INT)
RETURNS DATETIME
AS
BEGIN
    WHILE @numDays>0
    BEGIN
       SET @addDate=DATEADD(d,1,@addDate)
       IF DATENAME(DW,@addDate)='saturday' SET @addDate=DATEADD(d,1,@addDate)
       IF DATENAME(DW,@addDate)='sunday' SET @addDate=DATEADD(d,1,@addDate)

       SET @numDays=@numDays-1
    END

    RETURN CAST(@addDate AS DATETIME)
END
GO

Run the test

SELECT dbo.DAYSADDNOWK(GETDATE(), 15)