How many hours of darkness and daylight is there in Anchorage Alaska?

During summer, the sun is up 24 hours. During the winter, there's no sun at all.

The days and nights are each 12 hours at the spring and fall equinoxes.

The reason for this is because of that the earth is tilted.

Yes the sun does stay up for 24 hours in much of Alaska (anyplace north of the Arctic Circle) but the number of days without a sunset decreases as you move south. Barrow his more days then Nome and Nome has more days than Ft. Yukon.

Once you move south of the Arctic Circle (say Fairbanks) the sun does set, even on the longest day of the year. I lived in Alaska for 13 years.

Admittedly, is does not get "dark" for long periods of time but the sun has set. It is below the horizon.

The exact opposite is true in the winter.