Here is a thread in Microsoft Technet Forums for Project Standard and Professional General Questions and Answers:
There are two suggestions:
In the options/general menu, select "W04-4" in the date format. Then the start and finish dates will be displayed with the week number and day of the week.
You could also create a custom field with a formula ...
Don't change the start date (or end date) directly for status update purposes
Welcome to pm.stackexchange!
Here is the highly simplified version of how you use the tool:
At the time of preparing the project plan
You enter the project start date
You enter the tasks and their durations
You assign the resources for each task
You enter the predecessors for each ...