Get ready, folks. It's time for the semi-annual time change.

Daylight Saving Time will officially end at 2 a.m. Sunday morning. The saying is: "Spring forward, Fall back."

So, before going to bed Saturday night, roll your clocks back one hour so they'll be correct when you wake up Sunday morning.

According to a U.S. Navy Web site, it was decided - starting in 2007 - that Daylight Saving Time (Spring forward) will always begin on the second Sunday in March and end (Fall back) on the first Sunday in November.

Time zones - Pacific, Mountain, Central and Eastern - were made official by law in 1918.

The time change also was used in 1918, but it was an idea that met with opposition and was repealed in 1919. It was restablished during World War II as part of measures used to deal with that conflict.

By the time of the energy crisis in the 1970s, the twicea year changing of the time had become standard across most of the country.

Indiana did not adopt the time changes until 2006. Hawaii and most of Arizona don't observe the time changes.