This is a guide to adding a suffix (th nd st) to dates in Microsoft Word
Microsoft have not made it simple.
1) Put the cursor to the Insert position where you want the date to be.
2) In the ribbon bar click on the Insert tab, then Quick Parts, then Field.
3) Under Field Name, select Date and then click the Field Codes button.
4) In the Field Codes text box, type in this DATE \@ d \*Ordinal
5) Press OK and you’ll get the first part of the date with the suffix.
6) Press the Space bar to leave a space between the day and month.
7) Click on the Insert bar again, and Quick Parts again.
8) Then click Field, Choose Date again and click the Field Codes button again.
9) In the Field Codes box, type in DATE \@ “MMMM yyyy” including the speech marks.
10) Press OK and you should be done.
It wasnt easy to find that solution!
If you are interested, I got it out from this website which has an example document on how to manipulate dates in Word.
Look for Datecalc.zip on that page.