You can find it in these folders:

Windows XP
C:\Document and Settings\[Your Name]\Application
Data\Microsoft\Templates

Windows 2000
C:\Documents and Settings\Administrator\Application
Data\Microsoft\Templates

Windows ME
C:\Windows\Application Data\Microsoft\Templates

Windows 98
C:\Windows\Profiles\[Your Name]\Application Data\Microsoft\Templates

Once you have found the correct file, make a copy and save it in another folder in case you make a mistake on the current one. Next, right-click Normal.dot and click Open. Click View, then Header and Footer. Click in the footer box at the end of the template. Click Insert, Date and Time. Select the date style that you would like. Click "Update automatically." Click OK.

You have now edited the word template to your liking. Use the same process to customize this template more.