Spring Forward: Daylight Saving Time 2013 Begins Sunday

It's nearly time to "Spring Forward." 

At 2 a.m. on the morning of Sunday, March 10, we'll be springing our clocks forward—and losing an hour of the day, for Daylight Saving Time. The good news: sunset will be an hour later, which means the sun will set around 7 p.m. instead of 6 p.m. starting Sunday night.

You may have noticed the annual tradition of Daylight Saving Time has crept forward a bit. We used to spring forward on the first Sunday in April and fall back on last Sunday in October. But a couple years ago, Congress changed the date—adding more Daylight Saving Time to the calendar. This year, it will run from March 10 until Nov. 3.

Unless you're in Arizona, Hawaii, Puerto Rico or the U.S. Virgin Islands. They don't do Daylight Saving Time.

Around the world, about 75 countries and territories have at least one location that observes Daylight Saving Time, according to TimeandDate.com. On the other hand, 164 don't observe the time change at all.