Board Thread:The Quarters - Q & A/@comment-173.76.247.207-20170521151259/@comment-27659888-20170524231828

Against the daily yes. In the history of the task the completed time on a daily in when you cron.

The completed [taskid].completed is the date you completed today (if you have).

When you cron the [taskid].completed is cleared and history value is added to the array with date of you cron.