Why?  Daylight Saving Time allows us to use less energy in lighting our homes by taking advantage of the longer and later daylight hours.
Here is an informative article on how Daylight Savings Time got started:
It’s that time of year again. Get ready to trade an hour of sleep for  an extra hour of sunshine later in the day. Welcome to daylight saving  time!
At 2 a.m. on Sunday, March 11, it’s time to set your clocks ahead one  hour to account for the beginning of daylight saving time (DST).  That  means clocks will "spring ahead" from 2 a.m. to 3 a.m. in an instant,  causing everyone to lose one hour of precious beauty sleep.
So where did the concept of daylight saving time come from?  Well  it’s actually still fairly new in the United States. 
Some credit Benjamin Franklin with coming up with the idea of Daylight Savings Time in 1784. When visiting  Paris, he couldn't figure out why it was getting so sunny so early. He  also thought that by adjusting the time, people would save on candle  costs. However, DST was not implemented until 1916, when Germany and  Britain used it as a way to conserve energy during World War I. The  United States used it in 1918, but citizens were against the idea and it was abandoned.
DST came roaring back during World War II. From February 1942 until  September 1945, the United States observed the policy year-round.  However, it was abandoned again following the war after states and local  governments couldn’t agree with when DST should be implemented.
Like a boxer who just won’t stay down, DST made a triumphant return  in 1966 when Congress passed the Uniform Time Act which mandated that all states opting to observe DST move their  clocks forward one hour on the last Sunday in April and one hour back  on the last Sunday in October.
That law was amended in 1986 to start DST on the first Sunday in  April.  The end date remained the same as the last Sunday in October.  This new system started in 1987.
Well the whole system changed again in 2005. The Energy Policy Act of 2005 extended daylight saving time in the United  States another four weeks.  Now DST begins on the second Sunday in March  and ends on the first Sunday in November.
This was done in hopes of saving money on energy bills by making the  day longer, earlier in the year. However, Congress retains the right to  revert back to the 1986 law should the change prove unpopular or if  energy savings are not significant enough.
So now you know why we “spring ahead” in March and “fall back” in  November every year with our clocks.
Another fun fact is that the time change will precede the first day  of spring and the vernal equinox this year, which is set to take place at 1:14 am on March 20th.
So remember, on Sunday, March 11, at 2 a.m., set those clocks ahead  one hour. And then you have until Nov. 4 to adjust to the time change.  Have fun!
 
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