Once again, most Americans will set their clocks forward by one hour this weekend, losing perhaps a bit of sleep but gaining more glorious sunlight in the evenings as the days warm into summer.
Where did this all come from, though?
How we came to move the clock forward in the spring, and then push it back in the fall, is a tale of that spans over more than a century — one that's driven by two world wars, mass confusion at times and a human desire to bask in the sun for a long as possible.
There's been plenty of debate over the practice, but about 70 countries — about 40% of those across the globe — currently use what Americans call daylight saving time.
Here are some things to know about the practice of humans changing time:
How it all began
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In the 1890s, George Vernon Hudson, an astronomer and entomologist in New Zealand, proposed a time shift in the spring and fall to increase the daylight. And in the early 1900s, British home builder William Willett, troubled that people weren't up enjoying the morning sunlight, made a similar push. But neither proposal gained enough traction to be implemented.
Germany began using daylight saving time during World War I with the thought that it would save energy. Other countries, including the United States, soon followed suit. During World War II, the U.S. once again instituted what was dubbed "war time" nationwide, this time year-round.
In the United States today, every state except Hawaii and Arizona observes daylight saving time. Around the world, Europe, much of Canada and part of Australia also implement it, while Russia and Asia don't currently.
Inconsistency and mass confusion
After World War II, a patchwork of timekeeping emerged across the United States, with some areas keeping daylight saving time and others ditching it.
"You might have one town has daylight saving time, the neighboring town might have daylight saving time but start it and end it on different dates and the third neighboring town might not have it at all," says David Prerau, author of the book "Seize the Daylight: The Curious and Contentious Story of Daylight Saving Time."
At one point, if riders on a 35-mile bus ride from Steubenville, Ohio, to Moundsville, West Virginia, wanted their watches to be accurate, they'd need to change them seven times as they dipped in and out of daylight saving time, Prerau says.
So in 1966, the U.S. Congress passed the Uniform Time Act, which say states can either implement daylight saving time or not, but it has to be statewide. The act also mandates the day that daylight saving time starts and ends across the country.
If we didn't change the clocks
Changing the clocks twice a year leads to a lot of grumbling, and pushes to either use standard time all year or stick to daylight saving time all year often crop up.
During the 1970s energy crisis, the U.S. started doing daylight saving time all year long, and Americans didn't like it. With the sun not rising in the winter in some areas until around 9 a.m. or even later, people were waking up in the dark, going to work in the dark and sending their children to school in the dark, Prerau says.
"It became very unpopular very quickly," Prerau says.
And, he notes, using standard time all year would mean losing that extra hour of daylight for eight months in the evenings in the United States.
