use zo_strformat for correct format

Author Marc <scootworks@me.com>
Author date 2018-05-08 02:53:56
Author local date 2018-05-08 04:53:56 +0200
Committer GitHub <noreply@github.com>
Committer date 2018-05-08 02:53:56
Committer local date 2018-05-08 04:53:56 +0200
Commit c03a2752626a6ef405e924006d29ae3832d5659f
Tree fff9e446969b8bca97dc5406feacf0b8a73bac37
Parent cb74d1b871e3d7dd0383028e636b6008d47b54ec
use zo_strformat for correct format