Philadelphia is 2 hours ahead of Mexico City
Best overlap: 8:00 AM to 4:00 PM in Mexico City is 10:00 AM to 6:00 PM in Philadelphia.
Mexico City and Philadelphia overlap from 8:00 AM to 4:00 PM (Mexico City) to the equivalent 10:00 AM to 6:00 PM in Philadelphia — that's your meeting window. Plenty of room to work with: 8 hours of daily overlap means you can prioritise people's preferences over the clock. The difference isn't constant year-round: Philadelphia adjusts for daylight saving while Mexico City holds steady.