In 2014, daylight saving time, or DST, began in the United States on March 9. It ended Nov. 2, 2014. The current schedule for U.S. DST is to set clocks ahead one hour on the second Sunday in March, then set them back on the first Sunday in November.
Some U.S. states, such as Arizona, choose not to follow daylight saving time. Similarly, not every country participates in daylight saving time.The dates for switching to and from DST vary around the world, especially in the Southern Hemisphere, where spring begins in November. People can remember how to change their clocks by using the mnemonic phrase "spring forward, fall back."