add default value to embedded report

I think this is a long shot, but it never hurts to ask.

I've created a timesheet form with tabs for Monday, Tuesday, etc.

I want the users to enter data in an editable embedded report on each tab.

Is there any way to have the date in the embedded report auto-fill based on which tab the user is on? For example, if I'm entering data in the Sunday tab, can the "date" field in the child records default to the date that corresponds to Sunday?