Create a Milestone to Mark a Significant Event in Your Project

A milestone is an action or event marking a significant change or stage in your project. The finish date for a milestone is the same as its start date. A milestones is represented by a grey diamond image in the Gantt chart, centered on the provided start time.

To create a milestone:

1. Click Gantt View on the toolbar to display your sheet in Gantt view or to add a Gantt chart to your sheet.
   

2. Enable dependencies on your sheet (click Edit Project Settings in the top right corner of the Gantt chart and check the Dependencies Enabled checkbox). 

3. Enter a task duration of 0 (zero), and a start date, to create a milestone.

TIP: To create an extended milestone, enter a task duration of ~0, and a start date. An extended milestone requires one full working day to complete, but is still represented by a diamond shape in the Gantt chart.

Parent rollup functionality is not compatible with milestones. Percent complete rollups won't be calculated in tasks with sub-tasks containing milestones with a duration of zero (0).