Counting Month Ends

Written by Allen Wyatt (last updated July 18, 2023)
This tip applies to Excel 2007, 2010, 2013, 2016, 2019, 2021, and Excel in Microsoft 365


Kim has a worksheet into which she places a start date (column C) and an end date (column D). She needs a way to calculate the count of month ends between the two dates. For instance, if the start date is 1/1/17 and the end date is 7/31/17, the number of month ends is 7. If, however, the end date is 7/30/17, the number of month ends is 6.

There are any number of formulas you could devise to calculate the proper count. The simplest formula is if you can always count on the date in column C being the start of a month. In that case, the following formula will work just fine:

=DATEDIF(C1,D1+1,"m")

If you cannot count on column C containing a date that is the start of a month, but you can count on the beginning and ending dates always being in the same year, then any of the following formulas will do the trick:

=IF(MONTH(D1+1)=MONTH(D1),MONTH(D1)-MONTH(C1),MONTH(D1)-MONTH(C1)+1)
=IF(MONTH(D1+1)=MONTH(D1),MONTH(D1)-1,MONTH(D1))-MONTH(C1)+1
=MONTH(EOMONTH(D1,0))-MONTH(EOMONTH(C1,0))+(EOMONTH(D1,0)=D1)
=IF(EOMONTH(D1,0)=D1,MONTH(D1)-MONTH(C1)+1,MONTH(D1)-MONTH(C1))
=IF(D1<EOMONTH(D1,0),MONTH(D1)-1,MONTH(D1))-MONTH(C1)+1
=MONTH(D1)-MONTH(C1)+IF(D1=EOMONTH(D1,0),1,0)

If the years on the beginning and ending dates might be different, then the formulas are a bit more complex. Any of the following variations will calculate the correct number of month ends in the date range:

=12*(YEAR(D1)-YEAR(C1))+MONTH(D1)-MONTH(C1)+INT(D1=EOMONTH(D1,0))
=12*(YEAR(D1)-YEAR(C1))+MONTH(D1)-MONTH(C1)+IF(EOMONTH(D1,0)=D1,1,0)
=12*YEAR(D1)+MONTH(D1)-12*YEAR(C1)-MONTH(C1)+IF(D1=EOMONTH(D1,0),1,0)
=12*YEAR(D1)+MONTH(D1)-12*YEAR(C1)-MONTH(C1)+(D1=EOMONTH(D1,0))
=12*YEAR(D1)+MONTH(D1)-12*YEAR(C1)-MONTH(C1)+(DAY(D1+1)=1)
=MONTH(D1)+12*YEAR(D1)-MONTH(C1)-12*YEAR(C1)+IF(EOMONTH(D1,0)=D1,1,0)
=(MONTH(D1+1)+12*YEAR(D1+1))-(MONTH(C1)+12*YEAR(C1))
=IF(D1=EOMONTH(D1,0),1,0)+MONTH(D1)-MONTH(C1)+((YEAR(D1)-YEAR(C1))*12)
=IF(EOMONTH(D1,0)=D1,(MONTH(D1)-MONTH(C1)+1)+(YEAR(D1)-YEAR(C1))*12,MONTH(D1)-MONTH(C1)+(YEAR(D1)-YEAR(C1))*12)
=IF(D1=EOMONTH(D1,0),DATEDIF(EOMONTH(C1,-1),EOMONTH(D1,0),"m"),DATEDIF(EOMONTH(C1,-1),EOMONTH(D1,0),"m")-1)
=IF(D1<C1,"Error",MONTH(D1)-MONTH(C1)+IF(D1MONTH(D1+1))*1)
=IF(D1<C1,"Error",(YEAR(D1)-YEAR(C1))*12+(MONTH(D1)-MONTH(C1))+(EOMONTH(D1,0)=D1))
=SUM(N(FREQUENCY(EOMONTH(ROW(INDIRECT(C1&":"&D1)),0),EOMONTH(ROW(INDIRECT(C1&":"&D1)),0))>0))-(D1<EOMONTH(D1,0))

Some of these formulas are a bit long, so you'll want to carefully watch that you get them all if you choose to use one.

If you prefer to use a macro approach, then the following user-defined function may be of interest:

Function CountMonthEnds(sd As Date, ed As Date) As Integer
    Dim ceom As Integer
    Dim cmonth As Integer
    Dim lmonth As Integer
    Dim x As Date

    cmonth = 0
    ceom = 0
    cmonth = Month(sd)
    lmonth = cmonth
    ' go to end date + 1 to allow for end date being end of month
    For x = sd To ed + 1
        cmonth = Month(x)
        If cmonth <> lmonth Then
            ceom = ceom + 1
            lmonth = cmonth
        End If
    Next x
    CountMonthEnds = ceom
End Function

The macro simply steps through all the dates between the beginning and ending dates. It looks at the month for each of the dates, and if it changes, then it counts that as a "month end." This count is returned by the function.

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (572) applies to Microsoft Excel 2007, 2010, 2013, 2016, 2019, 2021, and Excel in Microsoft 365.

Author Bio

Allen Wyatt

With more than 50 non-fiction books and numerous magazine articles to his credit, Allen Wyatt is an internationally recognized author. He is president of Sharon Parq Associates, a computer and publishing services company. ...

MORE FROM ALLEN

Button for Leaving Full-Screen Mode

If you display your document in full-screen mode, there are a couple of ways you can get back to normal mode. One method ...

Discover More

Inserting a Cross-Reference to Text

Cross-referencing is a great feature of Word that allows you to add references to text in various places of your ...

Discover More

Printing Index Field Codes

Word allows you to configure what you see so that field codes are visible instead of the results of those field codes. ...

Discover More

Best-Selling VBA Tutorial for Beginners Take your Excel knowledge to the next level. With a little background in VBA programming, you can go well beyond basic spreadsheets and functions. Use macros to reduce errors, save time, and integrate with other Microsoft applications. Fully updated for the latest version of Office 365. Check out Microsoft 365 Excel VBA Programming For Dummies today!

More ExcelTips (ribbon)

Using a Text Function with a Date/Time Returns an Error

If you use a text function with a date or time, you'll get an error. To understand why this occurs (and how to get around ...

Discover More

Parsing Non-Standard Date Formats

When you load data into Excel that was created in other programs, the formatting used for some types of data (such as ...

Discover More

The Last Business Day

Many businesses need to know when the last business day of the month occurs. This tip discusses several ways you can ...

Discover More
Subscribe

FREE SERVICE: Get tips like this every week in ExcelTips, a free productivity newsletter. Enter your address and click "Subscribe."

View most recent newsletter.

Comments

If you would like to add an image to your comment (not an avatar, but an image to help in making the point of your comment), include the characters [{fig}] (all 7 characters, in the sequence shown) in your comment text. You’ll be prompted to upload your image when you submit the comment. Maximum image size is 6Mpixels. Images larger than 600px wide or 1000px tall will be reduced. Up to three images may be included in a comment. All images are subject to review. Commenting privileges may be curtailed if inappropriate images are posted.

What is 2 + 2?

There are currently no comments for this tip. (Be the first to leave your comment—just use the simple form above!)


This Site

Got a version of Excel that uses the ribbon interface (Excel 2007 or later)? This site is for you! If you use an earlier version of Excel, visit our ExcelTips site focusing on the menu interface.

Newest Tips
Subscribe

FREE SERVICE: Get tips like this every week in ExcelTips, a free productivity newsletter. Enter your address and click "Subscribe."

(Your e-mail address is not shared with anyone, ever.)

View the most recent newsletter.