Photo by Jon Tyson on Unsplash
Daylight saving time (DST), also referred to as 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, the mnemonic: “spring forward and fall back”).
According to the Department of Transportation, which oversees the nation’s time zones, two states and five U.S. territories do not observe daylight saving time.
- Arizona (with the exception of the Navajo Nation)
- Hawaii
- American Samoa
- Guam
- Northern Mariana Islands
- Puerto Rico
- U.S. Virgin Islands.
