When did extreme sunlight appear in the Arctic?

The extreme day began to appear at the North Pole on the second day after the vernal equinox (March 2 1), and then the place where the extreme day appeared gradually expanded from the North Pole, that is, 90 north latitude to low latitude. During the summer solstice (June 22), the extreme days in the northern hemisphere reach the largest range, within the entire Arctic Circle. Then, the place where the extreme day appears gradually shrinks from the Arctic Circle like the North Pole until the autumnal equinox (9