Within Teamwork, you can set start and end dates for your projects.
When you are first creating a project, you can choose a start and due date for the project in the Dates tab of the new project modal.
While viewing an existing project, hover over the project name and click the three dots on the right. In the project options menu, select the Set Dates option within the Manage Project section.
In the set dates modal, you can choose a specific start and end date for the project.
If there are tasks already in your project, the dates will be set taking those into account and you can edit them if you prefer to choose specific dates.
You can choose to ignore conflicting task and milestone dates, and also mark the project as complete.
Once you have added project dates, you will see them listed in the project details pane on the left-hand side of the Overview section. You can also edit the dates directly from here either by clicking one of the dates or via the Edit option.
If you don't yet have project dates set, you will instead see an option to set them in the left sidebar.
For more information, see: Adding a Project