The data date in Primavera is the date on which all future work will be re-scheduled. All information,
regarding the project plan, that is before the data date is actual information, after the data date,
all the information is planned (planned start, finish, units, cost, etc).


When the project is in the planning phase, the Data Date must be the planned start date of the
project. Once the project has commenced, the data date will move forward depending on the
project length and control period defined.

This is how the Data Date line (the blue line) looks at the beginning of the project:

And this is how it looks during the execution phase:

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