# Excel EOMONTH Function

The Excel EOMONTH function returns the last day of the month, n months in the past or future. You can use EDATE to calculate expiration dates, due dates, and other dates that need to land on the last day of a month. Use a positive value for months to get a date in the future, and a negative value to get a date in the past.

**start_date**- A date that represents the start date in a valid Excel serial number format.**months**- The number of months before or after start_date.

EOMONTH takes two arguments: a start date, and months. Months represents the number of months to move in the future or past. For example, with May 12, 2017 in cell B5:

You can use EOMONTH to move through years as well:

See links below for more examples of how to use the EOMONTH function in formulas.

### Notes

- For
**months**, use a positive value for future dates and a negative value for dates in the past.

*Note: in Excel's date system, dates are serial numbers. January 1, 1900 is number 1 and later dates are larger numbers. To display date values in a human-readable date format, apply a the number format of your choice.*

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