Itsycal is a tiny calendar for your Mac's menu bar. http://www.mowglii.com/itsycal
Itsycal
Latest version:0.27.1
Release date:
A tiny calendar in the Mac menu bar. The date sits in the menu bar and opens to a month view with events synced from the system calendar, where new events can be created quickly. The lightweight native implementation suits checking the schedule without opening a full calendar app.