EOMONTH (Transact-SQL)

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

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.

date

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.

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)

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)

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)