Summary: Ref T6881. This makes it easier to fire a trigger and make sure it works properly. You can use the `--now` flag to travel through time, and test scheduling conditions with `--last` and `--next`. It will tell you when the trigger would reschedule. Better than waiting 24 hours to see if things work. Test Plan: Fired some backups, got useful output which made me think my code probably works correctly. Reviewers: btrahan Reviewed By: btrahan Subscribers: epriestley Maniphest Tasks: T6881 Differential Revision: https://secure.phabricator.com/D11438