Istanbul is 1-2 hours ahead of Paris. Istanbul uses Turkey Time (TRT, UTC+3) while Paris uses Central European Time (CET/CEST). When it's 12:00 PM in Paris, it's 1:00 PM (CEST) or 2:00 PM (CET) in Istanbul.
Turkey no longer observes daylight saving time, but France does. The difference is 1 hour during European summer time and 2 hours during winter.
Best calling time: 10:00 AM - 6:00 PM Istanbul time. This corresponds to 9:00 AM - 5:00 PM (CET) or 8:00 AM - 4:00 PM (CEST) in Paris, covering French business hours.
Istanbul and Paris are major cultural capitals connected by direct flights taking about 3.5 hours. Both cities have rich histories and are popular tourist destinations with significant business ties.