Comment 3 for bug 1154920

Looks like the problem is fairly isolated in common/CommonUtils.vala:

in next_run_date(), it always returns the return of most_recent_scheduled_date(), or if comparing to last_run returns a negative timespan, then it adds the configured period.

Turns out that most_recent_scheduled date always returns a DateTime at 00:00Z due to the way it's computed.