Sometimes, it is valuable to see the Gantt chart in a relative timeline because the actual start date of the project may not yet be known.
You have to enter a start date for the project to get scheduled. But you can view the Gantt chart in relative dates instead of real dates.
Navigate to the Gantt chart and click on More
Click on Time Display in the pop-up menu, and the Time Display selection window will open up
Select the desired time display format