Can't schedule a clean

I just downloaded Comodo System Utilities to test and when I go into the Clean tab of Registry cleaner and try to Schedule a Clean I am getting stymied. I choose a weekly frequency on Sunday at 11:00, but I get an error ribbon on top of the window which says:

The date of the task must be set in the future.

But there is no calendar, simple check boxes next to each day of the week. Can someone help me out?