Every task and tag has two sets of dates. Estimated Start and Estimated End are the planned dates. Actual Start and Actual End record when work really started and finished. gantterAi™ fills in the actual dates for you from the % complete.
How actual dates are set
Actual Start fills in with the current date and time as soon as % complete is set above 0% (any value from 1 to 100).
Actual End fills in with the current date and time when % complete reaches 100%.
Both fields are read-only. You can't type in them directly.
Where to see them
Open a task (double-click or F2). The actual dates are in the header of the Task Properties panel, under the estimated dates.
Tasks and tags stay in sync
If you update % complete on a board tag, the matching task in the Gantt view updates too, and the other way around. The actual dates follow on both.
Tip
Update progress on the day the work actually starts and finishes. If you mark many tasks complete at once later, their actual dates will all show that later date, not when the work was done.