The practice of daylight saving time spans over a century of U.S. law. Here's who started it and why we observe the time change.

Here's what to know about when DST started and ends in 2025, why it exists and if President Donald Trump is actually ending it.

Researchers are discovering that "springing ahead" each March for daylight saving time is connected with serious negative health effects.

Daylight saving time starts Sunday, despite sleep experts (and the president) hoping to eliminate time changes.

A plurality of 48 percent favors keeping standard time all year; 24 percent would put daylight saving time in place throughout the year.

Investigations into the 1986 Space Shuttle Challenger disaster revealed that key decision-makers worked on little sleep, raising concerns that fatigue impaired their judgment. Similarly, in 1989, the Exxon Valdez oil spill resulted in a massive environmental catastrophe.

According to TimeAndDate.com, daylight saving time 2025 will end on Sunday, Nov. 2. Clocks on this date will turn back by an hour (the ones that still have to be changed manually, anyway), meaning plenty of folks will be treated to some extra shut-eye.

Daylight saving time begins on Sunday, March 9, meaning most Americans will lose an hour of sleep as we "spring forward."

Arizona maintains its refusal to observe Daylight Saving Time due to considerations of intense heat and lifestyle.

Arizona does not observe daylight saving time, remaining on Mountain Standard Time year-round and avoiding the annual shift of losing and gaining an hour. The rest of the country,

Daylight saving time runs from the second Sunday in March to the second Sunday in November. Digital clocks will automatically advance one hour at 2 a.m. on March 9.

Most of Indiana used to observe standard all year long until 2006. That's when all Hoosiers switched to daylight saving time. What would our summers look like?