Which of the following is the longest day of the year in northern hemisphere?

The summer solstice in the Northern Hemisphere occurs around June 22nd (can vary June 20-22). This is when the North Pole is tilted closest to the sun, resulting in the longest day and shortest night of the year. June 30th, July 2nd, and July 25th are all after the solstice when days have already begun shortening. The exact date varies slightly year to year, but June 22nd is generally recognized as the longest day.