calendar(1) on OpenBSD
The text 9e8497cec5da, as OpenBSD 6.3, OpenBSD 6.2, OpenBSD 6.1, OpenBSD 6.0, OpenBSD 5.9 shipped it.
reminder service
Flags it lists
-
-A -
-B -
-a -
-b -
-f -
-t -
-w