Why do we change the clocks twice a year?

Why we change the clocks

Why and how did we start changing our clocks twice a year?

On November first, most of America fell back an hour.

And this summer, the House voted to stop switching for good.

To see where this is heading, it helps to know how we got here.

Franklin's joke and the first real proposals

The idea is older than you might think.

In 1784, Benjamin Franklin joked that Parisians could save candles by simply getting up earlier.

It was satire.

The serious proposals came later, from New Zealand entomologist George Hudson in 1895, and British builder William Willett in 1907, who hated seeing people sleep through bright summer mornings.

World War I and the patchwork

What finally made it happen was war.

In 1916, Germany moved its clocks forward to save coal.

Britain followed within weeks, and the United States joined in 1918.

After the war, Congress repealed the national rule, and the country slid into a patchwork of local times.

7 time changes in 35 miles: the 1966 law

It got messy.

By the 1960s, one 35-mile bus ride from Moundsville, West Virginia, to Steubenville, Ohio, could pass through seven time changes.

So in 1966, Congress passed the Uniform Time Act.

States could opt out of daylight saving time, but if they used it, they had to follow the same dates.

Today's dates

Today, most of the country springs forward on the second Sunday in March and falls back on the first Sunday in November.

Those dates come from a 2005 energy law.

Hawaii and most of Arizona don't switch at all.

Does it save energy? Health costs

So does it actually save energy?

The evidence is thin.

A Department of Energy study found the extra weeks cut electricity use by about half a percent a day.

A study in Indiana found household electricity use went up.

Meanwhile, researchers have linked the spring switch to a short rise in heart attacks and car crashes, as people lose an hour of sleep.

Permanent DST vs standard time

That's why so many people want to stop switching.

But there's a catch.

Which time do you keep?

Supporters of permanent daylight saving time want brighter evenings all year.

Critics point to winter sunrises after nine a.m. in some places.

America tried that in 1974 and dropped it within a year.

Many sleep scientists favor permanent standard time instead.

In July 2026, the House passed a bill for permanent daylight saving time, with support from both parties.

The Senate hasn't voted on it.

Recap

So we change our clocks because of a wartime fuel-saving experiment that kept coming back.

Whether it finally does is now up to the Senate.

ThatsWhyHow.