MicroMenuCal is a very simple flyout calendar and menu bar clock replacement app that includes functionality that isn't built into macOS.
Use as a replacement for the macOS menu bar clock
Supports 12-hour and 24-hour (military time)
Can show time of the day, day of the week, and business quarter
Works in Dark mode
A fully signed and notarized native application
Choose whether or not to run MicroMenuCal each time your Mac starts up
Free as in air pollution
No Ads!
What’s new in version 1.10
Updated on Aug 25 2021
Version 1.10:
Made calendar window large and enabled it to be moved from the menu bar and positioned freely on screen
Added an option to automatically minimize the built-in menu bar clock on Big Sur, which can no longer be disabled but can be minimized to better allow alternative menu bar clocks to be used