Persistent data across changing calendar?

Hello, I'm trying to make a week timesheet for work to keep track of my hours and pay. I'm having trouble understanding where to go from where I am.

The kind of functionality I want is to be able to change the week (as I can do with the buttons I have set up), but have the time data for each week be saved only for that week. So if I were to click the "Next Week" button, the time entered in the sheet would change to show the next week's data.

Can this be done?