Reykjavik is 9 hours ahead of Anchorage
Best overlap: 8:00 AM to 9:00 AM in Anchorage is 5:00 PM to 6:00 PM in Reykjavik.
The overlap falls at 8:00 AM to 9:00 AM in Anchorage, or 5:00 PM to 6:00 PM if you're in Reykjavik. The overlap is tight at roughly 1 hour, so protect it: 8:00 AM in Anchorage / 5:00 PM in Reykjavik is your safest recurring slot. Watch the DST gap — when Anchorage changes its clocks and Reykjavik stays the same, this window slides by an hour.