San Diego is 9 hours behind Zurich
Best overlap: 5:00 PM to 6:00 PM in Zurich is 8:00 AM to 9:00 AM in San Diego.
The overlap falls at 5:00 PM to 6:00 PM in Zurich, or 8:00 AM to 9:00 AM if you're in San Diego. The overlap is tight at roughly 1 hour, so protect it: 5:00 PM in Zurich / 8:00 AM in San Diego is your safest recurring slot.