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June 21st, or thereabouts, in the Northern Hemisphere.

Updated: Almost every day is 24 hrs, with exception of day light savings when clock is put forward an hour so that day is 23hrs, and when it ends, clock is put back an hour that day is 26 hrs long. So technically the longest day is the day daylight savings ends, which is different for most countries. ;-)

Now, if the real question is what day has the longest amount of day light or "day time", then that would probably match the answer someone gave above. Yeah someone could argue the term "day" refers to the day light hours, but then ask yourself, how many hours in a day, it's 24 right, we don't say around about 12 depending on time of year.

Another viewpoint: There are indeed several definitions of "day" and they are all correct. You just need to remember there could be some confusion and you may need to clarify what's meant in a particular case. With this question it's

pretty obvious that the amount of "daylight" in 24 hours is what's meant.

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11y ago
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9y ago

On the surface of the Earth, I would expect the days to be the longest

at the north and south poles, where the sun stays above the horizon,

just going around and around the sky, for six months at a time.

Regarding the question of "when" ... If you split the year into two pieces, between

March 21 and September 21, then the piece with June 21 in the middle is light at the

north pole and dark at the south pole, and the piece with December 21 in the middle

is the opposite situation.

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9y ago

The longest day of the year is the summer solstice, which is when the earth is the most tilted towards the sun, so the amount of light received is the most and the night is the shortest. If you are in the northern hemisphere it will be in June, around the 20th (it changes slightly every year) and if you're in the southern hemisphere it will be around the same date in December

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9y ago

Each day is exactly the same length, 86,400 seconds.

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Q: Where and when would you expect days to be the longest in the year?
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