SQL SERVER – Find Last Day of Any Month

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