Actively Update The Date/time Information Constantly

I am currently using:

=TODAY() and

=NOW()

to enter date/time on a sheet that is used to create a printed form. I want to ensure that the date/time are current when the form is printed, but they will actually only reflect when the workbook was opened. So, if the employee opens the workbook, then takes a break or answers the phone, when he prints the sheet the date/time may be wrong.

I need to have the worksheet either:

1. actively update the date/time information constantly
2. update it before printing,
3. or possibly have the workbook "time out" and close if there is no activity for 60 seconds or so.

I already have code entered to prevent a "do you want to save changes" promt when closing. And I am using a command button for print which closes the workbook automatically once the employee prints the form (to ensure that all other data is entered fresh everytime the workbook is used).