All calendar events are from the systems Calendar app. Many third party calendar apps also use the systems calendar as the source.
This app displays a countdown as a complication to the start and end of your calendar events, so if youre looking forward to the end of a boring class, see how much longer you can still prepare for the meeting ahead of you, this app is for you.
This app is perfect for analog watch faces, because calculating exact time left in a calendar event is extra hard in these watch faces.
Full day calendar events are ignored, do not set events that overlap in time.