Hi Neil,
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/index.php?showtopic=249902
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.
For the first field in that example, you'll need to change the coding to:
{QUOTE{ASK StartDate "What is the Start date?"} {REF StartDate \@ "dddd, d MMMM yyyy"}}
For the second field, you'll need to replace the four 'DATE' strings with 'StartDate'. The remaining fields can be used as they are - though you might want to change the date formatting on all the fields.
Note: The field brace pairs (ie '{ }') for the above example are created via Ctrl-F9 - you can't simply type them or copy & paste them from this message.