Dates, Durations, and Milestones

When a task is created it must always have a date associated with it. The system uses today’s date as the default start and end date (unless otherwise specified), and sets a default duration of 1 day. This enables you to quickly create new tasks merely by entering a task name. The following rules govern changes made to the task dates and duration:

  • If the DURATION value is changed, the system keeps the START date the same and calculates the END date based on that change.
  • If the START date is changed, the system keeps the DURATION value the same and calculates the END date based on the new START date.
  • If the END date is changed, the system keeps the START date the same and calculates the DURATION based on the new END date.


Unlike typical tasks in a project, which have a distinct amount of time scheduled for completion, milestones are a special type of task with zero duration. Milestones are meant to track significant tasks within a project plan, like the completion of a phase of a project, the delivery of an asset, or a key juncture for evaluation. 

To establish a milestone, first have an existing task in place, then click that task's duration and enter "0" as the duration. That task will then display as a milestone with a distinctive duration symbol (◆), as seen here:

NOTE: Milestones will also display with the same duration symbol above on the Gantt Chart view.

To show milestones exclusively, you can filter the main Projects area (using the top Filter button) for tasks with a duration of zero, as seen here:

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