Longest Day Of The Year 2024. The longest day of the year falls on either june 20 or 21 every year in the northern hemisphere. Time and date of the solstice 2025.
In 2024, the summer solstice will occur on thursday 20 june at 9.51pm bst (4:50 pm edt new york, 1:50pm pdt los angeles). North of the equator, it’s the june solstice.