EOMONTH

See Also

Returns the serial number for the last day of the month that is the indicated number of months before or after start_date. Use EOMONTH to calculate maturity dates or due dates that fall on the last day of the month.

If this function is not available, and returns the #NAME? error, install and load the Analysis ToolPak add-in.

Show How?

On the Tools menu, click Add-Ins.
In the Add-Ins available list, select the Analysis ToolPak box, and then click OK.
If necessary, follow the instructions in the setup program.

Syntax

EOMONTH(start_date,months)

Start_date is a date that represents the starting date. Dates should be entered by using the DATE function, or as results of other formulas or functions. For example, use DATE(2008,5,23) for the 23rd day of May, 2008. Problems can occur if dates are entered as text.

Months is the number of months before or after start_date. A positive value for months yields a future date; a negative value yields a past date.

If months is not an integer, it is truncated.

Remarks

Microsoft Excel stores dates as sequential serial numbers so they can be used in calculations. By default, January 1, 1900 is serial number 1, and January 1, 2008 is serial number 39448 because it is 39,448 days after January 1, 1900. Microsoft Excel for the Macintosh uses a different date system as its default.
If start_date is not a valid date, EOMONTH returns the #NUM! error value.
If start_date plus months yields an invalid date, EOMONTH returns the #NUM! error value.

Example

The example may be easier to understand if you copy it to a blank worksheet.

Show How?

Create a blank workbook or worksheet.
Select the example in the Help topic. Do not select the row or column headers.

Selecting an example from Help
Press CTRL+C.
In the worksheet, select cell A1, and press CTRL+V.
To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Tools menu, point to Formula Auditing, and then click Formula Auditing Mode.

1

2

A
Date
01/01/2008
Formula	Description (Result)
=EOMONTH(A2,1)	Date of the last day of the month, one month after the date above (February 29, 2008)
=EOMONTH(A2,-3)	Date of the last day of the month, three months before the date above (October 31, 2007)

Note To view the number as a date, select the cell and click Cells on the Format menu. Click the Number tab, and then click Date in the Category box.