rdate(8) on OpenBSD
The text 29729e842967, as OpenBSD 5.6, OpenBSD 5.5, OpenBSD 5.4 shipped it.
set the system's date from a remote host
Flags it lists
-
-4 -
-6 -
-a -
-c -
-n -
-o -
-p -
-s -
-v