Link for discovering daylight hours in Alaska

My cruise in May (2012), I was amazed at all the daylight hours so early in the Alaska season.  I looked online and see that today, there are 19 hours of daylight.  This dusk picture is after dinner, 10:30pm.

Use this link and choose a date:
http://www.timeanddate.com/worldclock/astronomy.html?n=18