Our recent update is about you having the option to change the date on when the task had been completed, you can choose the dates before or the current date of completion. The changes you have made will also reflect in the task activity log.
Editing the Completion Date
Hover over the check symbol on the upper left corner of the task which is the " Complete the Task" icon.
After clicking choose click thee dropdown arrow.
Click Modify Completion Date.
A pop up will appear giving you an option to change the date and time of the completion date.
You can head over the activity log to check the recent changes you have made with the task.