Tuesday, July 22, is expected to be the second of three days in 2025 where more than a millisecond could be shaved off the day due to Earth's rotation

July 22 will be the second-shortest day of the year, as Earth completes a full rotation in less time than usual.

Anyone trotting out the well-worn "it’s been a long day" line on July 22 might end up having to rephrase, as Earth is set for its second shortest day on record due to an inexplicable recent acceleration of the planet's rotation. The latest estimate is that July 22 will end an imperceptible 1.