For January (the month with the shortest daylight at the northern hemisphere) the daylight times for Iceland and the Netherlands:
Reykjavík 11.20-15.45 (4,5h) Amsterdam 08.50-16.35 (7,5h)
For July, the month with the longest daylight times at the northern hemisphere:
Reykjavík 03.10-23.55 (20,5h) Amsterdam 05.25-22.05 (16,5h)