Change the Project Start date in P6

1. Select the project you want to change the project start date in the
Project Workspace.
2. Select View, Show on Bottom, Project Details…
3. Click on the Dates tab: change the dates both in the
Planned Start and Data Date fields.

4. Open this project by right-clicking it in the Project workspace
and then select Open Project

5. Press F9 and check the date in the Current Data
Date field; make sure that the data date is the one just you have
changed.

6. Click on the Schedule button.