From Word help
Insert the current date and time
Click where you want to insert the date or time.
On the Insert menu, click Date and Time.
If you want to insert the date or time in a different language format, then click the language in the Language box.
The Language box includes a list of the enabled editing languages. Additional date and time options may also be available, depending on the language that you selected.
In the Available formats box, click a date or time format.
Select whether you want the date to automatically update or to remain as originally inserted. Do one of the following:
To insert the date and time as a field that's automatically updated when you open or print the document, select the Update automatically check box.
To maintain the original date and time as static text, clear the Update automatically check box.