Daylight Savings Time Ends This Sunday

Daylight saving time will end this Sunday, Nov. 4 at 2 a.m. This means you will "fall back" and set your clocks back one hour. Daylight saving begins again on March 10, 2013.

When you change your clocks, it’s also a good time to change smoke detector batteries and check to make sure they are in working order, local fire officials say.

Arizona, Puerto Rico, Hawaii, the U.S. Virgin Islands and American Samoa do not observe Daylight Saving.

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.

National Geographic has an interesting history of Daylight Saving and time standardization here.