This Sunday marks the annual switch to Daylight Saving Time (DST) in most U.S. states. At 2:00 a.m. on the second Sunday of March, clocks are moved forward by one hour, effectively extending the amount of daylight in the evenings. This change is then reversed on the first Sunday of November, when clocks are moved back by one hour to Standard Time. However, it's important to note that not all U.S. states observe DST. Hawaii and most of Arizona do not observe DST, while some other states have proposed legislation to end the practice.