16 Facts About Time zones

Time zones zone is an area which observes a uniform standard time for legal, commercial and social purposes.

Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following 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, ranging from UTC-12:00 to UTC+14:00.

The offsets are usually a whole number of hours, but a few Time zones are offset by an additional 30 or 45 minutes, such as in India, South Australia and Nepal.

Royal Observatory, Greenwich, founded in 1675, established Greenwich Mean Time zones, the mean solar time at that location, as an aid to mariners to determine longitude at sea, providing a standard reference time while each location in England kept a different time.

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In 1870 he proposed four ideal time zones having north–south borders, the first centered on Washington, D C, but by 1872 the first was centered on meridian 75° west of Greenwich, with natural borders such as sections of the Appalachian Mountains.

The borders of its time zones ran through railroad stations, often in major cities.

The border between its Eastern and Central time zones ran through Detroit, Buffalo, Pittsburgh, Atlanta, and Charleston.

North American Time zones were named Intercolonial, Eastern, Central, Mountain, and Pacific.

Time zones proposed 24 hourly time zones, which he called "longitudinal days", the first centred on the meridian of Rome.

Time zones proposed a universal time to be used in astronomy and telegraphy.

The proposal divided the world into twenty-four time zones labeled A-Y, each one covering 15 degrees of longitude.

Time zones advocated his system at several international conferences, including the International Meridian Conference, where it received some consideration.

The system has not been directly adopted, but some maps divide the world into 24 time zones and assign letters to them, similarly to Fleming's system.

Web servers presenting web pages primarily for an audience in a single time zone or a limited range of time zones typically show times as a local time, perhaps with UTC time in brackets.

The use of local time for time-stamping records is not recommended for time zones that implement daylight saving time because once a year there is a one-hour period when local times are ambiguous.