Reykjavik is 5 hours ahead of Washington, D.C.
Best overlap: 8:00 AM to 1:00 PM in Washington, D.C. is 1:00 PM to 6:00 PM in Reykjavik.
Both offices are open during 8:00 AM to 1:00 PM Washington, D.C. time, which is 1:00 PM to 6:00 PM in Reykjavik. Roughly 5 hours of common time means scheduling is manageable; just avoid the very edges of the window. The window above shifts seasonally: Washington, D.C. keeps daylight saving while Reykjavik ignores it.