The standard practice is to set clocks back by one hour in the fall, not by 20 minutes. Specifically, in the United States, clocks are set back one hour at 2:00 a.m. on the first Sunday of November, which in 2025 will be November 2. In the UK and much of Europe, clocks are set back by one hour on the last Sunday of October; in 2025, this will be October 26. There is no common or official practice to set clocks back by 20 minutes. The change is generally one full hour to mark the end of Daylight Saving Time and the return to Standard Time, allowing an extra hour of sleep and earlier morning light.