SQL Server Function to Get number of Days in month

by ebarcza 11/4/2011 10:12:00 AM
CREATE FUNCTION [dbo].[fn_GetDaysInMonth] ( @pDate    DATETIME )
RETURNS INT
AS
BEGIN
    RETURN CASE WHEN MONTH(@pDate) IN (1, 3, 5, 7, 8, 10, 12) THEN 31
                WHEN MONTH(@pDate) IN (4, 6, 9, 11) THEN 30
                ELSE CASE WHEN (YEAR(@pDate) % 4    = 0 AND
                                YEAR(@pDate) % 100 != 0) OR
                               (YEAR(@pDate) % 400  = 0)
                          THEN 29
                          ELSE 28
                     END
           END
 
END

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SQL SERVER

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