Copenhagen is 6 hours ahead of Boston. When it's 9:00 AM in Boston, it's 3:00 PM in Copenhagen. Both cities observe DST, maintaining the 6-hour difference year-round.
Boston uses ET (Eastern Time) while Copenhagen uses CET/CEST.
Optimal window: 8:00 AM - 12:00 PM Boston time (2:00 PM - 6:00 PM Copenhagen). Morning calls from Boston reach afternoon business hours in Copenhagen.
Boston and Copenhagen share strong ties in biotech, clean energy, and academic research.