ical(1) on Linux
The text c69531272be6, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster) shipped it.
A Hijri/Islamic calendar (and converter)
Flags it lists
-
--dual -
--fixed_view -
--gregorian -
--help -
--hijri -
--umm_alqura -
-d -
-f -
-g -
-h -
-hi -
-u