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: Automatically Advancing by a Month.

# Automatically Advancing by a Month

by Allen Wyatt
(last updated December 19, 2015)

Jim has a need to advance the date in a particular cell by one month at midnight on the 14/15 of each month (00:00:00 on the 15th), and he wondered how it could be done.

As with many problems in Excel, the answer depends on the nature of the data involved and exactly what you want to do. If the date in the cell is today's date, and you simply want to have the cell display the current month up through the 14th, and then next month after that, then you can use a formula such as the following:

```=CHOOSE(IF(DAY(NOW())>14,MONTH(NOW())+1,MONTH(NOW())),
"January","February","March","April","May","June",
"July","August","September","October","November",
"December","January")
```

This formula returns the name of a month, not a date. If you prefer to have a date returned, you can use this formula:

```=IF(DAY(NOW())>14,DATEVALUE(IF(MONTH(NOW())=12,1,
MONTH(NOW())+1) & "/" & DAY(NOW()) & "/" & IF(MONTH(
NOW())=12,YEAR(NOW())+1,YEAR(NOW()))),NOW())
```

Both of these formulas account for the "end of year wrap-around" when you advance from December to January. A shorter version of this last formula can be created if you use the DATE function instead of the DATEVALUE function:

```=DATE(YEAR(NOW()),(MONTH(NOW())+((DAY(NOW())>14)*1),1)
```

This formula, unlike the DATEVALUE example, always returns a date that is the first day of any given month.

If you really want to advance the value of a particular date in a cell, then you must use a macro to do the task. Further, you must make sure that the macro only runs once a month, at a particular time on a particular day. For instance, if you wanted the macro to run at 00:00:00 on the 15th of each month, you would need to set up the macro so that it checked the date and time, and then ran at that particular date and time. You would also need to make sure that the workbook containing the macro was open over that date and time.

The following macro will fetch the date from a cell and increase it by a month. The macro assumes that you have a named range, DateCell, which refers to the cell to be updated.

```Sub IncreaseMonth()
Dim dDate As Date
dDate = Range("DateCell").Value
Range("DateCell").Value = _
DateSerial(Year(dDate), _
Month(dDate) + 1, Day(dDate))
End Sub
```

To make sure that the macro runs at the appropriate time, you would need another macro. The following macro is designed to be run whenever the workbook is opened:

```Private Sub Workbook_Open()
If Day(Now) = 14 Then
Application.OnTime ("23:59:59"), "IncreaseMonth"
End If
End Sub
```

Notice that this particular macro sets the OnTime method so that it runs the IncreaseMonth macro at 23:59:59 on the 14th. This date and time was chosen because it is easier to catch than is 00:00:00 on the 15th.

Remember that the IncreaseMonth macro will only run if you open the workbook on the 14th, and then leave the workbook open until the 15th.

Note:

If you would like to know how to use the macros described on this page (or on any other page on the ExcelTips sites), I've prepared a special page that includes helpful information. Click here to open that special page in a new browser tab.

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (11751) 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: Automatically Advancing by a Month.

##### 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

Collecting Highlighted Text Selections

Got a document with text passages marked with the highlighter tool? You can collect all those highlighted selections and ...

Discover More

Changing the Number of Columns in the Middle of a Document

Need to have multiple columns in a page layout that normally consists of a single column? You can change the column ...

Discover More

Converting European Dates to US Dates

Those in Europe use a date format that is different than those in the US; this is not news. But what if you need to ...

Discover More

Excel Smarts for Beginners! Featuring the friendly and trusted For Dummies style, this popular guide shows beginners how to get up and running with Excel while also helping more experienced users get comfortable with the newest features. Check out Excel 2013 For Dummies today!

##### More ExcelTips (ribbon)

Unique Military Date Format

Some industries (such as the military) have special formatting that they use to represent dates. Here is one such format ...

Discover More

Unique Date Displays

Need to print an elapsed date in a strange format? It's easier to do than may appear at first glance. Here's a discussion ...

Discover More

Calculating Fractions of Years

When working with dates and the relationship between dates, Excel provides a variety of worksheet functions that may ...

Discover More
##### Subscribe

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

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}] 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 nine more than 2?

2016-10-29 09:54:30

Maurice Ball

1. It is not clear what "Date" Jim wants to advance by a month on the 14/15th of the month. If the Day(dDate)>28 then for some months you will get an invalid result. If you adjust the formula to get a proper date ie, not beyond the end of the next month, like 31 November, you will eventually bring any dates after 28 back to 28.

2. To ensure the you get Valid dates by adding a month I suggest:-

Sub IncreaseMonth()

Dim dDate As Date
dDate = Range("DateCell").Value
Range("DateCell").Value = _
End Sub

2015-12-22 08:34:14

Michael (Micky) Avidan

@Jeremy,
The general principle is shown hereunder:
--------------------------
Sub Previous Month Name()
' PM1 returns the previous month's name for ANY given date:
PM1 =Application.Text(Application.EoMonth(Now, -1), "MMMM")
' PM2 returns the previous month's name for the FIRST day of a Month:
PM2 = Application.Text(Now - 1, "MMMM")
End Sub
--------------------------
Michael (Micky) Avidan
“Microsoft® Answers" - Wiki author & Forums Moderator
“Microsoft®” MVP – Excel (2009-2016)
ISRAEL

2015-12-21 05:24:57

Barry

@Jeremy

2015-12-20 15:10:24

Jeremy

Hi, very useful.
However I'm trying to do something similar, which is saving a file on the first business day of each month, in a folder corresponding to the month of the last business day of the previous month.
The macro works well for any day apart from the first day of the next month.
For instance, if I ran my macro on December 1st, I would like the file to be saved in the November folder, however it saves the file in the December folder.
Do you have any tip to tweak my code please.

2015-12-19 05:38:24

Michael (Micky) Avidan

Unless I misunderstood something - how wrong will I be by using:
=EDATE(NOW(),N(DAY(NOW())>14))
--------------------------
Michael (Micky) Avidan
“Microsoft® Answers" - Wiki author & Forums Moderator
“Microsoft®” MVP – Excel (2009-2016)
ISRAEL

2015-12-19 05:27:58

Jon

=DATE(YEAR(NOW()),(MONTH(NOW())+((DAY(NOW())>14)*1),1)

has an extra ( before MONTH which causes an error.

Should be
=DATE(YEAR(NOW()),MONTH(NOW())+((DAY(NOW())>14)*1),1)

##### 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.