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time zone is a geographic region that observes a uniform standard time. Time zones tend to follow the boundaries of countries and their subdivisions. Daylight saving time is the practice of adjusting local clock time by an hour for part of the year. Each timezone either observes standard time all year round (as in Russia or South Africa), or standard time during winter and daylight time during summer (as in most of the United States and Europe).

Most of the time zones on land are offset from Coordinated Universal Time (UTC) by a whole number of hours (UTC−12 to UTC+14). However, there are a few zones that are offset by 30 or 45 minutes, such as Newfoundland Standard Time (UTC−03:30), Nepal Standard Time (UTC+05:45), and Indian Standard Time (UTC+05:30).

Related terms

  • Time
  • Time bucket
  • Time range
  • Timezone offset
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