Vancouver is 2 hours behind Medellín
Best overlap: 10:00 AM to 6:00 PM in Medellín is 8:00 AM to 4:00 PM in Vancouver.
Schedule calls for 10:00 AM to 6:00 PM in Medellín — your colleagues in Vancouver will be online from 8:00 AM to 4:00 PM. Because you share 8 hours of the workday, there's no need to compromise; book the time that suits the meeting, not the map. Remember that Vancouver shifts for daylight saving and Medellín doesn't, so recalculate the overlap after each clock change.