Trucos de Sql Server Incrementar fecha con días hábiles

CREATE FUNCTION fAddWorkingDay (@Start datetime, @NumOfDays integer)
RETURNS datetime
AS
BEGIN
DECLARE @NextDay datetime
DECLARE @Counter int

IF @NumOfDays>0
BEGIN
SET @Counter=1
-- Drop the time part and initialize the Return Variable

SET @NextDay=CONVERT(datetime ,(CONVERT(char(10),@Start,102)),102 )

WHILE @Counter <= @NumOfDays
BEGIN
SET @NextDay = dbo.fNextWorkingDay(@NextDay)
SET @Counter=@Counter+1
END
END
ELSE
BEGIN
SET @Counter=ABS(@NumOfDays)
-- Drop the time part and initialize the Return Variable

SET @NextDay=CONVERT(datetime ,(CONVERT(char(10),@Start,102)),102 )

WHILE @Counter>0
BEGIN
SET @NextDay = dbo.fPreviousWorkingDay(@NextDay)
SET @Counter=@Counter-1
END
END

RETURN @NextDay
END