Preventing Future Opportunities from Showing up in Kiosk Mode

We would like to disable future volunteer shifts from showing up in the kiosk mode. We have had some issues with student volunteers checking in to a future shift  that occurs later in the week from the kiosk. Due to our high volume of volunteers, we automatically approve kiosk hours, and have accidently approved these future hours. We do not have the staff or resources to sort through each and every check in and ensure they are all for the correct date.