(CNN)Here's some background information about Daylight Saving Time, a system to reduce electricity usage by extending daylight hours.
Sunday, March 12, 2017 - Daylight Saving Time begins at 2 am. Set clocks ahead one hour.
1784 - The idea of daylight saving is first conceived by Benjamin Franklin.
In the United States, Hawaii and most of Arizona do not follow DLS.
About 70 countries around the world observe DLS.