Rio de Janeiro is 3 hours behind Reykjavik
Best overlap: 11:00 AM to 6:00 PM in Reykjavik is 8:00 AM to 3:00 PM in Rio de Janeiro.
Target 11:00 AM to 6:00 PM in Reykjavik, which lands at 8:00 AM to 3:00 PM for the Rio de Janeiro side. Rio de Janeiro is 3 hours behind Reykjavik, but with 7 hours of common ground you can hold morning or afternoon meetings without anyone working odd hours.