Menu Calendar makes available under the menu bar a small calendar usable also for date calculation. It is available from any application you are running.
How to use it:
From inside any application you run on your Mac, Manu calendar is always available sitting in the menu bar.
Clicking it's icon under the menu bar not it shows a small standard calendar that you can use to navigate inside any month and year.
It makes available a small area under the calendar for date calculation, past and future.
Add or subtract days, months, years in few clicks. Menu Calendar will instantly show the resulting day.
Simplicity and effectiveness are the primary features of Menu Calendar.
Features:
Runs and is available within any application you run from the menu bar
Can run at user login
Doesn't take precious screen space
It's fast, it pops up in a fractions of seconds
You can make date calculation in a single click (no typing required)
You can have it always on your menu bar (optional launch at login)