Mexico City is 1 hour behind Ottawa
Best overlap: 9:00 AM to 6:00 PM in Ottawa is 8:00 AM to 5:00 PM in Mexico City.
Schedule calls for 9:00 AM to 6:00 PM in Ottawa — your colleagues in Mexico City will be online from 8:00 AM to 5:00 PM. Because you share 9 hours of the workday, there's no need to compromise; book the time that suits the meeting, not the map. Finally, Ottawa observes daylight saving and Mexico City doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.