You would do better to create this in Excel, as that application can do date calculations far more easily than Word. That said, to see how to do this and just about everything else you might want to do with dates in Word, check out my
Microsoft Word Date Calculation Tutorial, at:
http://windowssecrets.com/forums/sho...ation-Tutorial
or:
http://www.gmayor.com/downloads.htm#Third_party
In particular, look at the item titled
Calculate a Date Sequence. Do read the document's introductory material.