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EOMONTH (Transact-SQL)

SQL Server 2012

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

Topic link icon Transact-SQL Syntax Conventions

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 can be remoted to SQL Server 2012 servers and higher. It cannot be remoted to servers with a version lower than SQL Server 2012.

A. EOMONTH with explicit datetime type

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

Here is the result set.

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

(1 row(s) affected)

B. EOMONTH with string parameter and implicit conversion

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

Here is the result set.

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

(1 row(s) affected)

C. EOMONTH with and without the month_to_add parameter

DECLARE @date DATETIME = 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.

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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