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

This SQL function works similar to Excel WORKDAY function. Hope it can help you.

CREATE FUNCTION [dbo].[BusDaysDateAdd] 
(
   @FromDate date,
   @DaysToAdd int
)
RETURNS date
AS
BEGIN
   DECLARE @Result date
   DECLARE @TempDate date
   DECLARE @Remainder int
   DECLARE @datePartValue int

   SET @TempDate = (DATEADD(week, (@DaysToAdd / 5), @FromDate))
   SET @Remainder = (@DaysToAdd % 5)
   SET @datePartValue = DATEPART(weekday, @TempDate)
   SET @Result = DATEADD(day,@Remainder + CASE WHEN @Remainder > 0 AND @datePartValue = 7 THEN 1
                                                WHEN @Remainder >= 1 AND @datePartValue = 6 THEN 2
                                                WHEN @Remainder >= 2 AND @datePartValue = 5 THEN 2
                                                WHEN @Remainder >= 3 AND @datePartValue = 4 THEN 2
                                                WHEN @Remainder >= 4 AND @datePartValue = 3 THEN 2
                                                WHEN @Remainder >= 5 AND @datePartValue = 2 THEN 2
                                                ELSE 0 END, @TempDate)
   RETURN @Result
END
GO

Reference