Daylight saving time

Daylight saving time (DST), also referred to as daylight saving(s), daylight savings time, daylight time (United States and Canada), or summer time (United Kingdom, European Union, and others), is the practice of advancing clocks to make better use of the longer daylight available during summer so that darkness falls at a later clock time. The typical implementation of DST is to set clocks forward by one hour in spring or late winter, and to set clocks back by one hour to standard time in the autumn (or fall in North American English, hence the mnemonic: "spring forward and fall back").

As of 2025, polls indicate a majority of those polled in the United States favor abolishing DST,^[1] with momentum gaining in all areas where the practice persists either to abolish DST and switch permanently to standard time,^[2] or to make DST permanent. Common arguments for abolishing or making DST permanent include health risks, economic costs, lost sleep, and disruptions to daily routines.^[3]