Itsycal is a tiny calendar for your Mac's menu bar.
If you want, it will display your calendar events as a companion to the Mac Calendar app. You can also create and delete (but not edit) events.
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On OS X 10.10 Yosemite (but not 10.11 El Capitan*), you can move Itsycal in the menu bar just like the built-in Apple menu extras by holding down the ⌘ key and dragging.
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Most of Itsycal's features can be controlled with the keyboard.
|left/right arrows or H/L||previous/next month|
|up/down arrows or K/J||previous/next year|
|shift+arrows or h,j,k,l||move selection|
|w||toggle calendar weeks|
|⌘N||create a new event|
* Itsycal cannot move in the menu bar on OS X 10.11 because of changes made by Apple for security reasons. However, all hope is not lost. If you want to move Itsycal on 10.11, there is a clever app called Bartender that somehow manages to allow all of your menu bar items to move. ↩