Mexico City is 18 hours behind Wellington

Best overlap: 8:00 AM to 12:00 PM in Wellington is 2:00 PM to 6:00 PM in Mexico City.

The overlap falls at 8:00 AM to 12:00 PM in Wellington, or 2:00 PM to 6:00 PM if you're in Mexico City. Mexico City is 18 hours behind Wellington. That leaves about 4 hours of common time — enough for a meeting or two, so use it deliberately. The two cities aren't on the same date during this window — Mexico City runs the previous day from Wellington. Watch the DST gap — when Wellington changes its clocks and Mexico City stays the same, this window slides by an hour.