Time zone

  • this 2020 time zone map gives an example of the way time zones are mapped out.

    a time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes. time zones tend to follow the boundaries of countries and their subdivisions instead of longitude, because it is convenient for areas in close commercial or other communication to keep the same time.

    most of the time zones on land are offset from coordinated universal time (utc) by a whole number of hours (utc−12:00 to utc+14:00), but a few zones are offset by 30 or 45 minutes (e.g. newfoundland standard time is utc−03:30, nepal standard time is utc+05:45, indian standard time is utc+05:30 and myanmar standard time is utc+06:30).

    some higher latitude and temperate zone countries use daylight saving time for part of the year, typically by adjusting local clock time by an hour. many land time zones are skewed toward the west of the corresponding nautical time zones. this also creates a permanent daylight saving time effect.

  • history
  • notation of time
  • utc offsets worldwide
  • list of utc offsets
  • time zone conversions
  • nautical time zones
  • skewing of zones
  • daylight saving time
  • computer systems and the internet
  • time zones in outer space
  • see also
  • notes
  • further reading
  • references
  • external links

This 2020 time zone map gives an example of the way time zones are mapped out.

A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes. Time zones tend to follow the boundaries of countries and their subdivisions instead of longitude, because it is convenient for areas in close commercial or other communication to keep the same time.

Most of the time zones on land are offset from Coordinated Universal Time (UTC) by a whole number of hours (UTC−12:00 to UTC+14:00), but a few zones are offset by 30 or 45 minutes (e.g. Newfoundland Standard Time is UTC−03:30, Nepal Standard Time is UTC+05:45, Indian Standard Time is UTC+05:30 and Myanmar Standard Time is UTC+06:30).

Some higher latitude and temperate zone countries use daylight saving time for part of the year, typically by adjusting local clock time by an hour. Many land time zones are skewed toward the west of the corresponding nautical time zones. This also creates a permanent daylight saving time effect.