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EOMONTH (Transact-SQL)

Returns the last day of the month that contains the specified date, with an optional offset.

Topic link icon Transact-SQL Syntax Conventions

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EOMONTH ( start_date [, month_to_add ] )
start_date

Date expression specifying the date for which to return the last day of the month.

month_to_add

Optional integer expression specifying the number of months to add to start_date.

If this argument is specified, then EOMONTH adds the specified number of months to start_date, and then returns the last day of the month for the resulting date. If this addition overflows the valid range of dates, then an error is raised.

This function is capable of being remoted to SQL Server 2012 servers and above. It will not be remoted to servers of version below SQL Server 2012.

A. EOMONTH with explicit datetime type

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DECLARE @date DATETIME
SET @date = '12/1/2011'
SELECT EOMONTH ( @date ) AS Result
GO

Here is the result set.

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Result
------------
2011-12-31

(1 row(s) affected)

B. EOMONTH with string parameter and implicit conversion

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DECLARE @date VARCHAR(255)
SET @date = '12/1/2011'
SELECT EOMONTH ( @date ) AS Result
GO

Here is the result set.

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Result
------------
2011-12-31

(1 row(s) affected)

C. EOMONTH with and without the month_to_add parameter

Transact-SQL
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DECLARE @date DATETIME
SET @date = GETDATE()
SELECT EOMONTH ( @date ) AS 'This Month'
SELECT EOMONTH ( @date, 1 ) AS 'Next Month'
SELECT EOMONTH ( @date, -1 ) AS 'Last Month'
GO

Here is the result set.

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This Month
-----------------------
2011-12-31

(1 row(s) affected)

Next Month
-----------------------
2012-01-31

(1 row(s) affected)

Last Month
-----------------------
2011-11-30

(1 row(s) affected)
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