Within Teamwork, you can edit the date that a milestone was marked as completed.

Note: Only site administrators, project administrators, or people with permission to edit milestones can change the completed date.

To change a milestone's completion date, go to the Milestones area of a project, and select the Completed tab.

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Click the name of the milestone you want to update to go to the milestone details view.

In the details pane on the left-hand side, hover over Date Completed then select Modify.

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In the modify modal, you can change the person who completed the milestone, as well as the date the milestone was completed.

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Click Apply Changes to save the new milestone properties.

You can also access a milestone's details view via the Milestones section of the Everything area.

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Clicking a milestone here will open it in its associated project where you can modify the completed date.

For more information, see: Editing a Milestone Date