For 20 years Americans have been moving time with their clocks on the first Sunday in April and the last Sunday in October.

Not any more. That changed in August 2005, when Congress lengthened daylight saving time by four weeks in the name of energy efficiency.

The change takes effect this year on March 11. That’s when we change the time on our clocks. On this March day, we spring forward one hour.

Some airlines were angered, and it sent many scrambling to make sure countless automated systems switch at the right time.

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