iso8601(8) on Linux
The text fc0f0683ec02, as Debian 9 (Stretch) shipped it.
Part of the Pacemaker cluster resource manager
Flags it lists
-
-$ -
--date -
--duration -
--epoch -
--expected -
--help -
--local -
--now -
--ordinal -
--period -
--seconds -
--verbose -
--version -
--week -
-? -
-D -
-E -
-L -
-O -
-S -
-V -
-W -
-d -
-n -
-p -
-s