lunar(1) on Linux
The text 53122510567e, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
a calendar conversion utility
Flags it lists
-
--big5 -
--gb -
--help -
--utf8 -
-5 -
-b -
-g -
-h -
-i -
-l -
-s -
-t -
-u