Please Note: This article is written for users of the following Microsoft Word versions: 2007, 2010, 2013, and 2016. If you are using an earlier version (Word 2003 or earlier), this tip may not work for you. For a version of this tip written specifically for earlier versions of Word, click here: Determining Differences Between Dates.

Determining Differences Between Dates

by Allen Wyatt
(last updated June 18, 2018)

2

When you are programming macros, you should know that dates are stored internally, within variables, as serial numbers. The serial number represents the number of days elapsed since a starting "base date," specifically since 1 January 100. (Yes, that's the year 100.) This means that you can perform math with the serial numbers, if desired. You can, for instance, find the number of days between two dates by simply subtracting the dates from each other.

If you want to get fancier in your date calculations, you can use the DateDiff function. This function allows you, for instance, to determine the number of weeks or months between two dates. In order to use the function to find this type of information, you would do as follows:

iNumWeeks = DateDiff("ww", dFirstDate, dSecondDate)
iNumMonths = DateDiff("m", dFirstDate, dSecondDate)

The first line determines the number of weeks between the two dates, and the second determines the number of months between them.

Note:

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

WordTips is your source for cost-effective Microsoft Word training. (Microsoft Word is the most popular word processing software in the world.) This tip (12380) applies to Microsoft Word 2007, 2010, 2013, and 2016. You can find a version of this tip for the older menu interface of Word here: Determining Differences Between Dates.

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

Working with Document Links

Word makes it easy to establish links between documents. Here's how to change and manage those links easily.

Discover More

Specifying Sub-entries in an AutoMark File

An AutoMark file allows you to quickly and easily create an index from a document. This can be a great boon for large ...

Discover More

Cross-Referencing Index Entries

You've probably seen an index where an entry says something like 'Obsidian: See igneous rock.' This sort of ...

Discover More

Comprehensive VBA Guide Visual Basic for Applications (VBA) is the language used for writing macros in all Office programs. This complete guide shows both professionals and novices how to master VBA in order to customize the entire Office suite for their needs. Check out Mastering VBA for Office 2010 today!

More WordTips (ribbon)

Hiding Macros

Don't want a particular macro to be visible in the Macros dialog box? Once you understand the criteria that Word uses ...

Discover More

Creating a Document Font List

If you want a list of all the fonts used in a document, the answer isn't as simple as you may think. This tip uses macros ...

Discover More

Changing a Macro Description

Part of documenting macros is to provide a good, succinct description of what they do. Changing the description of an ...

Discover More
Subscribe

FREE SERVICE: Get tips like this every week in WordTips, 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}] 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 five less than 6?

2017-01-23 11:06:11

allen@sharonparq.com

Alex: Note that the tip is about VBA programming (macros). The base date in VBA is, indeed, much different than the base date within Excel itself.

And, this is not a recent change.

-Allen


2017-01-23 09:56:56

Alex Bayman

Interesting - I thought the base date was 1 January 1900. Is this a recent change by Microsoft?


This Site

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

Newest Tips
Subscribe

FREE SERVICE: Get tips like this every week in WordTips, 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.