Adding Date & Time
You can add the date that you last updated your page. This will show visitors if you worked on your page since the last time they visited so they know to expects some new editions. To add the date the page was updated follow these steps:
Click where you want your date and time to go. ( I usually type something like: This page was last updated on).
Go to Insert on the menu bar and click on Date and Time.
Choose the Date and Time Properties you want displayed.
Click on OK.
The date will automatically be updated each time you edit your page.