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# Timezone

A time zone is an area which observes a uniform [standard time](https://en.wikipedia.org/wiki/Standard_time) for [legal](https://en.wikipedia.org/wiki/Legal), [commercial](https://en.wikipedia.org/wiki/Commerce) and [social](https://en.wikipedia.org/wiki/Social) purposes. Time zones tend to follow the boundaries between [countries](https://en.wikipedia.org/wiki/Country) and their [subdivisions](https://en.wikipedia.org/wiki/Administrative_division) instead of strictly following [longitude](https://en.wikipedia.org/wiki/Longitude), because it is convenient for areas in frequent communication to keep the same time.

All time zones are defined as offsets from [Coordinated Universal Time](https://en.wikipedia.org/wiki/Coordinated_Universal_Time) (UTC), ranging from [UTC−12:00](https://en.wikipedia.org/wiki/UTC%E2%88%9212:00) to [UTC+14:00](https://en.wikipedia.org/wiki/UTC%2B14:00). The [offsets](https://en.wikipedia.org/wiki/UTC_offset) are usually a whole number of hours, but a few zones are offset by an additional 30 or 45 minutes, such as in [India](https://en.wikipedia.org/wiki/Indian_Standard_Time), [South Australia](https://en.wikipedia.org/wiki/Time_in_Australia) and [Nepal](https://en.wikipedia.org/wiki/Nepal_Time).

Some areas of higher [latitude](https://en.wikipedia.org/wiki/Latitude) use [daylight saving time](https://en.wikipedia.org/wiki/Daylight_saving_time) for about half of the year, typically by adding one hour to local time during [spring](https://en.wikipedia.org/wiki/Spring_\(season\)) and [summer](https://en.wikipedia.org/wiki/Summer).

Source: Wikipedia