Daylight saving time begins again at 2 a.m. Sunday, March 12.

For those who may not know the backstory on the time-changing occurrence, we’ve gathered some notable facts about daylight saving time: The tradition started with bug hunting In 1895, George Hudson, New Zealand entomologist, thought up the modern concept of daylight saving time. He proposed a two-hour time shift, so he’d have more after-work hours of sunshine to go bug hunting in the summer, according to National Geographic. He presented his idea to the Wellington Philosophical Society, but it didn’t have any legs until British builder William Willett suggested a similar concept in 1905. His idea would be presented to the British Parliament in 1909. Still, that practice would not officially become standard in the United Kingdom until 1916.

Germany was the first country to observe daylight saving time On April 30, 1916, Germany embraced daylight saving time to conserve electricity, according to History. com. Weeks later, the United Kingdom followed suit and introduced “summer time.”

It’s ‘saving’ not ‘savings’ Though many people add an ‘s’ at the end of saving when writing and talking about it, the term is daylight saving time.

It’s been a law in the U.S. since 1966, but its origins date to 1918 The law “to save daylight” was passed by Congress in 1918. After World War I, however, state governments were left to decide whether they wanted to continue with the time change.

The law resurfaced during World War II, but again, after the war, the time change decision was left to each state. Some states kept it, and others abandoned it.

Daylight saving time didn’t officially become a law until 1966, under the Uniform Time Act.

Congress did not decree the March and November daylight saving time slots until 2007. In that year, daylight saving time started the second Sunday in March and ended the first Sunday of November.

Not every U.S. state recognizes daylight saving time Though it’s become an international practice, there are a few places in the United States that do not observe daylight saving time. It is not observed in Hawaii and some areas in Arizona.

____ (Rich Barak of The Atlanta Journal-Constitution contributed to this report.)