How do I navigate to a day 120 (or other number of) days from a specific date
without actually counting the days between them?

I know I can easily write a formula in Excel, but more often I need to do
this while looking at my Outlook calendar and scheduling certain events based
on definite time intervals.

So, if I schedule an event on a date and want to schedule a reminder exactly
60 days prior, I would ordinarily first copy the event to the same date and
then edit the copied event (by putting "60 day Reminder" after the subject
line) and then changing the date manually.  I'd much rather just quickly
navigate to the correct date and paste the copy there.

Thanks for your help.