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Few questions are always popular. They keep on coming up through email, comments or from co-workers. Finding Last Day of Any Month is similar question. I have received it many times and I enjoy answering it as well.

I have answered this question twice before here:

SQL SERVER – Script/Function to Find Last Day of Month
SQL SERVER – Query to Find First and Last Day of Current Month

Today, we will see the same solution again. Please use the method you find appropriate to your requirement.

Following script demonstrates the script to find last day of previous, current and next month.

----Last Day of Previous Month
SELECT DATEADD(s,-1,DATEADD(mm, DATEDIFF(m,0,GETDATE()),0))
LastDay_PreviousMonth
----Last Day of Current Month
SELECT DATEADD(s,-1,DATEADD(mm, DATEDIFF(m,0,GETDATE())+1,0))
LastDay_CurrentMonth
----Last Day of Next Month
SELECT DATEADD(s,-1,DATEADD(mm, DATEDIFF(m,0,GETDATE())+2,0))
LastDay_NextMonth
ResultSet:
LastDay_PreviousMonth
———————–
2007-07-31 23:59:59.000

LastDay_CurrentMonth
———————–
2007-08-31 23:59:59.000

LastDay_NextMonth
———————–
2007-09-30 23:59:59.000

If you want to find last day of month of any day specified use following script.

--Last Day of Any Month and Year
DECLARE @dtDate DATETIME
SET @dtDate = '8/18/2007'
SELECT DATEADD(s,-1,DATEADD(mm, DATEDIFF(m,0,@dtDate)+1,0))
LastDay_AnyMonth
ResultSet:
LastDay_AnyMonth
———————–
2007-08-31 23:59:59.000

SUMBER: http://blog.sqlauthority.com/2007/08/18/sql-server-find-last-day-of-any-month-current-previous-next/