July 5, 2024, currently holds the record for the shortest day, clocking in 1.66 milliseconds short of the average. One theory is that Earth's distance from the moon will impact the length of a rotation, according to Popular Mechanics.

According to Time and Date, a website that tracks time and time zones, the current record holder for the shortest day on record was July 5, 2024, which was 1.66 milliseconds shorter than 24 hours. Each year since 2020 has seen a new shortest day on record.

Scientists anticipate that Earth's rotation will quicken enough to create three shorter days between July and August, starting Wednesday, July 9.