Hi SDruley,
I agree with teylyn that using the shortcut keys will make it immune to formulas. You can also do a shortcut for the current date. As a matter of fact there are lots of shortcuts. See:
http://office.microsoft.com/en-us/ex...010073848.aspx

If you want to get fancy you can add Icons onto your ribbon. There is one called Current Time and another called Current Date. Find them in Options, Customize the Ribbon, All Commands.