dateutils.dtest(1) on Linux
The text 3ecb4633aafe, as Debian 10 (Buster) shipped it.
Like test(1) but for dates.
Flags it lists
-
--backslash-escapes -
--base -
--cmp -
--eq -
--from-locale -
--from-zone -
--ge -
--gt -
--help -
--input-format -
--isvalid -
--le -
--lt -
--ne -
--nt -
--ot -
--quiet -
--version -
-V -
-b -
-e -
-h -
-i -
-q