Two zones, two schedules??

I have two zones set up on my doorbell ... one covers the yard and house sidewalk (Zone 1). The other covers the public sidewalk and street (Zone 2).I'd like alerts for Zone 1 24/7 but alerts for Zone 2 only from 9 pm to 7 am. How do I set this up? I went to modes, but it never asked about a particular zone, so I assume it's alerts for all or none. Thanks for your help.