Download Itsycal for OS X 10.8+
Itsycal is a tiny calendar for your menu bar.
If you want, it will display your appointments and serve as a companion to the Mac Calendar app.
| left arrow | previous month |
| right arrow | next month |
| space | today |
| shift+arrows or h,j,k,l | move selection |
| command-, | preferences |
| command-n | open Calendar app |