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Tip of the Day
Language: SQL
Expertise: Intermediate
Jun 17, 2008

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Calculate the Last Day of the Month for Any Given Date

The following code calculates the last day of the month for any given date:

Description: Calculates the last day of the month for any given date
*/
CREATE FUNCTION [dbo].[ufn_GetLastDayOfMonth]
(
   @inpuDate SMALLDATETIME
)
RETURNS INT 
AS 
BEGIN 
   DECLARE @endDate SMALLDATETIME
   DECLARE @tempDate SMALLDATETIME

   -- caluclates end date of the month 
   SET @tempDate = DateAdd(Month, 1, @inpuDate)
   SET @endDate = DateAdd(DAY, -1, 
   Cast(Cast(Month(@tempDate)As varchar(2))
     + '-1-' + Cast(Year(@tempDate)As varchar(4)) As DateTime))

   RETURN DATEPART(DAY, @endDate)

END 
Raja Krishna
 
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