When Is The Longest Day Of The Year 2024. Edt on june 20, according to timeanddate.com. The winter solstice is called the shortest day of the year because it is has the fewest hours of daylight, according to the old farmer’s almanac.

The summer solstice marks the start of astronomical summer and the longest day of the year. The summer solstice occurs for earth’s upper half when the northern hemisphere is tilted most closely toward the sun.