Need ability to ignore an outdoor sensor on a schedule

I just installed an outdoor door sensor on the gate to my backyard. I set it up to arm only on Away Mode. I would like the alarm to go off if someone opens the gate while I'm away. That should be simple enough, but I have a yard service that comes Tuesday mornings between 7:30 and 8:30AM. Which means if I'm out of town the alarm will go off when the guys open the gate. That's obviously not what I want. Is there a way to have this particular sensor be ignored on say Tuesdays from 7AM to 9:30AM?