Weekend in SQL

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER FUNCTION [dbo].[IsWeekEnd]
               (@dtDate DATETIME)
RETURNS BIT
AS
  BEGIN
    DECLARE  @IsWeekEnd BIT
   
    SELECT @IsWeekEnd = CASE ((Datepart(dw,@dtDate) + @@DATEFIRST - 7)%7)
                          WHEN 1 THEN 1
                          WHEN 0 THEN 1
                          ELSE 0
                        END
   
    RETURN @IsWeekEnd
  END

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