User based next upcoming date

I am trying to make PCR request app, in which the user will be requesting for pcr and getting an approval from the admin. I am trying to add a new module in the main screen, where a user can see when is his next pcr date ie. 8 days from the requested date.
How can i make it?

You can add a math column to calculate the upcoming date by adding 8 to the requested date.

Then, your new tab can be a calendar layout with the time being the upcoming date.