Please Note: This article is written for users of the following Microsoft Word versions: 97, 2000, 2002, and 2003. If you are using a later version (Word 2007 or later), this tip may not work for you. For a version of this tip written specifically for later versions of Word, click here: Determining Differences Between Dates.
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:
Please Note:
This article is written for users of the following Microsoft Word versions: 97, 2000, 2002, and 2003. If you are using a later version (Word 2007 or later), this tip may not work for you. For a version of this tip written specifically for later versions of Word, click here: 
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:
WordTips is your source for cost-effective Microsoft Word training. (Microsoft Word is the most popular word processing software in the world.) This tip (808) applies to Microsoft Word 97, 2000, 2002, and 2003. You can find a version of this tip for the ribbon interface of Word (Word 2007 and later) here: Determining Differences Between Dates.
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!
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