The U.S. House of Representatives voted to pass a bill.

The bill makes daylight saving time permanent.

Many members voted for it.

The Senate must still pass it.

Then it can become law.

President Donald Trump says he supports it.

The bill stops the clock change two times a year.

A poll last year asked people about the time.

Only 12% of American adults liked the current system.

Almost half did not like it.

Some groups want one time.

They are the American Medical Association and the American Academy of Sleep Medicine.

America tried permanent daylight saving time before.

That was in the 1970s.

Congress passed a law in 1973.

It was a trial from January 1974 to April 1975.

It lasted only until October 1974.

People were very unhappy.

So the law ended.

A big worry was schoolchildren.

They would go to school in the dark.

Kevin Birth is a professor at Queens College.

He remembers that time well.

He said it was "pitch black" during the school day.

Birth said more than clocks must change.

The U.S. has four time zones.

Sunrise times are very different in each zone.