CHARLESTON, S.C. (WCBD) -- President-elect Donald Trump pledged support last week for ending the customary biannual clock adjustment, a change already approved by South Carolina lawmakers. Trump wrote in a Dec. 13 Truth Social post that the Republican Party will "use its best efforts" to eliminate daylight saving time, deeming it an "inconvenient" and "very costly" practice. It involves setting the clocks forward one hour from standard time in the spring and backward one hour in the fall. That means later sunsets in the summer months and earlier sunrises in the winter months. Daylight saving time was first adopted in 1918 as a way to help conserve energy during World War I by extending daylight hours. It was repealed after a year and reinstated in 1942 during World War II, though states could switch back and forth at will, according to the University of Colorado Boulder. In 1966, Congress passed the Uniform Time Act, which standardized daylight saving time across the country -- except in Hawaii and Arizona which opted out. How war led to daylight saving time in the US Though it is unclear whether Trump favors permanent daylight time or standard time, most Americans support getting rid of the twice-a-year time change. A 2022 Monmouth University poll found that 61% of people want to end the current practice, with a plurality preferring to make daylight saving time permanent. Many health experts, however, advocate for permanent standard time (the time we observe from November to March), arguing that it more closely aligns with humans' natural circadian rhythm, which regulates cycles of alertness and sleepiness. In addition, experts say there is an increased risk of cardiovascular disease and heart attacks, strokes, depression, and digestive and immune-related diseases such as colitis in the week after the shift to daylight saving time. Attempts by congressional lawmakers to enact permanent daylight saving time have repeatedly failed, the most prominent being the "Sunshine Protection Act" introduced by Sen. Marco Rubio (R-Fla.) The act passed the Senate in 2022 but stalled in the House. "It's time to lock the clock and stop enduring the ridiculous and antiquated practice of switching our clocks back and forth," Rubio said in an Oct. 28 statement ahead of the most recent switch. "Let's finally pass my Sunshine Protection Act and end the need to 'fall back' and 'spring forward' for good." Trump's proposal could be a welcome change in dozens of states, including South Carolina, that have already passed legislation to eliminate the practice. Governor Henry McMaster signed a law in 2020 that would make daylight saving time permanent, but there is a catch: The law is contingent on an act of Congress. “If the United States Congress amends 15 U.S.C. Section 260a to authorize states to observe daylight saving time year-round, it is the intent of the South Carolina General Assembly that daylight saving time be the year-round standard of the entire State and all of its political subdivisions,” it reads. With permanent daylight saving time (depending on time zone and location), the sun would rise around 6:45 a.m. and set around 9:30 p.m. in the summer. In the winter, sunrise would be around 8:30 a.m. and sunset would be around 5:30 p.m. The clocks are set to turn forward again on March 9, 2025, at 2 a.m.