Daylight Saving Time: What and When is it? Twice a year, most U.S. states and around 70 other countries change their clocks. In 2023 in the U.S., we will “spring forward” on Sunday, March 12 by turning our clocks forward by one hour and will “fall back” on Sunday, November 5 by turning our clocks back by one hour. Daylight Saving Time (DST) as an idea has been around for a very long time. There is evidence that ancient civilizations used a system comparable to the one we