You can insert the current date as a field that updates each time that you open the document, or as a field that does not update.
Choose Insert - Field - More Fields and click the Document tab.
Click “Date” in the Type list and do one of the following:
To insert the date as a field that updates each time that you open the document, click ”Date” in the Select list.
To insert the date as a field that does not update, click “Date (fixed)” in the Select list.