Please Note: This article is written for users of the following Microsoft Excel versions: 2007, 2010, 2013, and 2016. If you are using an earlier version (Excel 2003 or earlier), this tip may not work for you. For a version of this tip written specifically for earlier versions of Excel, click here: Using the EOMONTH Function.
The EOMONTH function is used to return the serial number value for the last day of any particular month, past, present, or future. The syntax for the function is as follows:
=EOMONTH(base, offset)
The base value is a date from which the function should do its calculations, and the offset is a number that indicates how many months from the base date should be used. For instance, an offset of 0 would indicate that EOMONTH should return the last day of the month represented in base, whereas an offset of 4 would be four months after base, and –2 would be two months before.
As an example, the following are typical uses of EOMONTH. The first line can be used to return the last day of the current month, and the second line returns the last day of the month six months later than the date in A1:
=EOMONTH(NOW(),0) =EOMONTH(A1,6)
Remember that EOMONTH returns a serial number. Excel does not automatically format the serial number as a date. In other words, you will need to explicitly format the cell as a date.
ExcelTips is your source for cost-effective Microsoft Excel training. This tip (12156) applies to Microsoft Excel 2007, 2010, 2013, and 2016. You can find a version of this tip for the older menu interface of Excel here: Using the EOMONTH Function.
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2021-04-06 11:15:53
David James Bonin
I have often used the sequential nature of dates to get the last day of a month.
For example, if this formula represents the first of May...
    = DATE( 2021, 5, 1)
Then this formula represents the last day of April...
    = DATE( 2021, 5, 0 )
2020-08-21 10:20:08
J. Woolley
@Lee McIntyre
Put this in A1:
=TODAY()
2020-08-20 16:14:48
Lee McIntyre
Question: Today, 8/20/2020, I entered the example formula in a cell -- =EOMONTH(A1,6) -- and formatted the cell as a date. I expected 2/28/2021. Instead I got 7/31/1900. Any idea why?
2016-12-28 17:32:50
Alex B
Thanks Michael.
2016-12-27 08:43:08
Clas Henrik Ericsson
Want to know what is the last date on a Monday,Tuesday etcetera in a certain month?
EOMONTH(B2;0)-(MOD((EOMONTH(B2;0)-B2)/7;1)*7)
B2 = any date representing Mon,Tues,etcetera
Weekday col B Date Last date in month with weekday in Col B
5 2016-01-01 2016-01-29
6 2016-01-02 2016-01-30
7 2016-01-03 2016-01-31
1 2016-01-04 2016-01-25
2 2016-01-05 2016-01-26
3 2016-01-06 2016-01-27
4 2016-01-07 2016-01-28
5 2016-01-08 2016-01-29
6 2016-01-09 2016-01-30
7 2016-01-10 2016-01-31
2016-12-27 06:00:32
Michael (Micky) Avidan
@Alex B,
The following is a "biy" shorter:
=NOW()-DAY(NOW())+1
--------------------------
Michael (Micky) Avidan
“Microsoft®” MVP – Excel (2009-2017)
ISRAEL
2016-12-26 06:00:47
Alex B
In my browser 2 months before is showing as "?2", this should show as "-2" (both without the quotes).
EOMonth, is also a quick way of getting the 1st day of a month, ie for the 1st day of the current month =EOMONTH(NOW(),-1)+1.
In other words, get the last day of the previous month (-1) and add 1 day.
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Please Note:
This article is written for users of the following Microsoft Excel versions: 2007, 2010, 2013, and 2016. If you are using an earlier version (Excel 2003 or earlier), this tip may not work for you. For a version of this tip written specifically for earlier versions of Excel, click here: 
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