Are Sunday Group Crit sessions part of the current week, or the start of the new week?

In UX Academy, each week runs from Monday to Sunday. So Monday is the first day of the week, and Sunday is the last day of the week. 
We use a tool called Calendly to manage RSVPs for Group Crit sessions. Please note that, while Calendly shows weeks running from Sunday to Saturday, Group Crits are still logged on UX Academy’s Monday-to-Sunday schedule.