rdate(8) on OpenBSD
The text 73ad6297e0ed, as OpenBSD 4.1, OpenBSD 4.0, OpenBSD 3.9, OpenBSD 3.8, OpenBSD 3.7, OpenBSD 3.6 shipped it.
set the system's date from a remote host
Flags it lists
-
-4 -
-6 -
-a -
-c -
-n -
-p -
-s -
-v