Hi Jupke,
Getting Word to calculate dates is no trivial task. Nevertheless, 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://lounge.windowssecrets.com/ind...owtopic=249902
or
http://www.gmayor.com/downloads.htm#Third_party
In particular, look at the item titled 'Calculate a Date Sequence'. For the week calculation, I imagine you could use something based on the 'Calculate the # Days Difference Between Two Dates' example, by addinf code to divide the # days by seven and discarding the remainder. Do read the document's introductory material.