Daylight saving time ended Sunday in Los Angeles and across the U.S.

Daylight saving time ended Sunday morning at 2 a.m. when clocks were set back one hour, according to CBS News Los Angeles. This change marked the return to standard time for the year, a shift that affects millions of Americans including those in the Los Angeles area.

Daylight saving time, observed from March to early November, moves clocks one hour ahead to extend evening daylight during longer days. With its end, standard time returns, bringing earlier sunrises and sunsets during the fall and winter months, the National Weather Service explains.

The practice of daylight saving time began in the U.S. in 1918 during World War I to conserve fuel, as reported by CBS News Los Angeles. Though it was repealed after the war, states could choose to continue observing it. Later, during World War II and the 1970s energy crisis, year-round daylight saving time was briefly implemented but did not last.

Congress established a uniform start and end for daylight saving time in 1966. More recently, legislation called the Sunshine Protection Act passed the House in July aiming to make daylight saving time permanent, but no final decision has been made yet, according to CBS News Los Angeles.