Reykjavik is 8 hours ahead of San Diego
Best overlap: 8:00 AM to 10:00 AM in San Diego is 4:00 PM to 6:00 PM in Reykjavik.
Shoot for 8:00 AM to 10:00 AM in San Diego; your Reykjavik colleagues will see that as 4:00 PM to 6:00 PM. Overlap is at a premium — roughly 2 hours — so claim 8:00 AM in San Diego (4:00 PM in Reykjavik) for recurring calls and keep them on time. Don't be caught out by clock changes — San Diego observes daylight saving and Reykjavik doesn't, so the offset varies by an hour through the year.