dateutils.dconv(1) on Linux
The text 11033163597d, as Debian 10 (Buster) shipped it.
Convert DATE/TIMEs between calendrical systems.
Flags it lists
-
--backslash-escapes -
--base -
--format -
--from-locale -
--from-zone -
--help -
--input-format -
--locale -
--quiet -
--sed-mode -
--version -
--zone -
-S -
-V -
-b -
-e -
-f -
-h -
-i -
-q -
-z