Question

I need to create a function in TSQL that will move the date to Monday if the date passed is either a Saturday or Sunday only.

For example:

• 5/6/2012 should return 5/7/2012
• 5/12/2012 should return 5/14/2012

If the date is not a Saturday or Sunday, return the input date

Answer 1

This will give you the Monday following if the date is a Saturday or Sunday; otherwise, it will give you the date you provided.

DECLARE @Date DATETIME; SET @Date = GETDATE();

SELECT
    CASE (@@DATEFIRST + DATEPART(dw, @Date)) % 7
        WHEN 0 THEN DATEADD(day, 2, @Date) -- Saturday
        WHEN 1 THEN DATEADD(day, 1, @Date) -- Sunday
        ELSE @Date
    END AS Weekday

EDIT: Included Conrad Frix‘s solution to the @@DATEFIRST issue.