Paris is 9 hours ahead of San Diego during standard time. San Diego uses Pacific Time (PT, UTC-8) while Paris uses Central European Time (CET, UTC+1). When it's 12:00 PM in San Diego, it's 9:00 PM in Paris.
Both cities observe daylight saving time, though they change clocks on different dates. The difference is typically 9 hours but may temporarily be 8 or 10 hours during transition periods.
Best calling time: 7:00 AM - 8:00 AM San Diego time. This corresponds to 4:00 PM - 5:00 PM in Paris, catching the end of French business hours.
San Diego has a growing biotech industry with connections to French pharmaceutical companies. The city also attracts French tourists interested in its beaches and the nearby Mexican border culture.