Copenhagen is 6 hours ahead of Washington, D.C.
Best overlap: 8:00 AM to 12:00 PM in Washington, D.C. is 2:00 PM to 6:00 PM in Copenhagen.
The hours that work for both Washington, D.C. and Copenhagen are 8:00 AM to 12:00 PM (Washington, D.C.) and 2:00 PM to 6:00 PM (Copenhagen). With about 4 hours of overlap, there's comfortable room for a daily stand-up — 8:00 AM in Washington, D.C. / 2:00 PM in Copenhagen works well.