dateutils.dadd(1) on Linux
The text 8b90bb8c387e, as Debian 8 (Jessie) shipped it.
Add DURATION to DATE/TIME and print the result.
Flags it lists
-
--backslash-escapes -
--format -
--from-zone -
--help -
--input-format -
--quiet -
--sed-mode -
--version -
--zone -
-S -
-V -
-e -
-f -
-h -
-i -
-q -
-z