Reykjavik is 1 hour behind Prague
Best overlap: 9:00 AM to 6:00 PM in Prague is 8:00 AM to 5:00 PM in Reykjavik.
The hours that work for both Prague and Reykjavik are 9:00 AM to 6:00 PM (Prague) and 8:00 AM to 5:00 PM (Reykjavik). Plenty of room to work with: 9 hours of daily overlap means you can prioritise people's preferences over the clock. The difference isn't constant year-round: Prague adjusts for daylight saving while Reykjavik holds steady.