calendar(1) on macOS
The text 35b2e20f3861, as macOS 15.3, macOS 15.2, macOS 15.1, macOS 15.0, macOS 14.6, macOS 14.5, macOS 14.4, macOS 14.3, macOS 14.2, macOS 14.1, macOS 14.0 shipped it.
reminder service
Flags it lists
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-A -
-B -
-D -
-F -
-U -
-W -
-a -
-d -
-f -
-l -
-t