Get Number of days in month

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER FUNCTION [dbo].[udf_GetNumDaysInMonth] ( @myDateTime DATETIME )
RETURNS INT
      AS
  BEGIN
  DECLARE @rtDate INT
    SET @rtDate = CASE WHEN MONTH(@myDateTime)
          IN (1, 3, 5, 7, 8, 10, 12) THEN 31
          WHEN MONTH(@myDateTime) IN (4, 6, 9, 11) THEN 30
    ELSE CASE WHEN (YEAR(@myDateTime) % 4 = 0
            AND
              YEAR(@myDateTime) % 100 != 0)
          OR
        (YEAR(@myDateTime) % 400 = 0)
            THEN 29
      ELSE 28 END
    END
  RETURN @rtDate
  END

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