Mexico City is 8 hours behind Barcelona
Best overlap: 4:00 PM to 6:00 PM in Barcelona is 8:00 AM to 10:00 AM in Mexico City.
Barcelona and Mexico City overlap from 4:00 PM to 6:00 PM (Barcelona) to the equivalent 8:00 AM to 10:00 AM in Mexico City — that's your meeting window. Mexico City is 8 hours behind Barcelona, which leaves a narrow 2-hour window. Treat 4:00 PM in Barcelona (8:00 AM in Mexico City) as the time and build around it. The difference isn't constant year-round: Barcelona adjusts for daylight saving while Mexico City holds steady.