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This article needs additional citations for. Unsourced material may be challenged and removed. (September 2012) () A time zone is a region of the globe that observes a uniform for,, and purposes. Time zones tend to follow the boundaries of and their subdivisions because it is convenient for areas in close commercial or other to keep the same.

Texas Instruments 1394 Ohci Driver Windows 7 there. Most of the time zones on land are offset from (UTC) by a whole number of hours (UTC−12 to UTC+14), but a few zones are offset by 30 or 45 minutes (e.g. Is UTC−03:30, is UTC+05:45, and is UTC+05:30). Some higher latitude and zone countries use 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. This also creates a permanent time effect. Contents • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • History Early timekeeping Before were first invented, it was common practice to mark the time of day with (also called 'true' solar time) – for example, the time on a – which was typically different for every location and dependent on longitude.

When well-regulated mechanical clocks became widespread in the early 19th century, each city began to use some local. Apparent and mean solar time can differ by up to around 15 minutes (as described by the ) because of the elliptical shape of the Earth's orbit around the Sun () and the tilt of the Earth's axis (). Mean solar time has days of equal length, and the difference between the two sums to zero after a year. (GMT) was established in 1675, when the was built, as an aid to mariners to determine at sea, providing a standard reference time while each city in England kept a different local time. Railway time. Plaque commemorating the Railway General Time Convention of 1883 in North America Local solar time became increasingly inconvenient as rail transport and telecommunications improved, because clocks differed between places by amounts corresponding to the differences in their geographical longitudes, which varied by four minutes of time for every degree of longitude.

For example, is about 2.5 degrees west of (East ), so when it is solar noon in Bristol, it is about 10 minutes past solar noon in London. The use of time zones accumulates these differences into longer units, usually hours, so that nearby places can share a common standard for timekeeping. The first adoption of a standard time was on December 1, 1847, in Great Britain by using GMT kept by portable. The first of these companies to adopt standard time was the (GWR) in November 1840. This quickly became known as.

About August 23, 1852, time signals were first transmitted by from the Royal Observatory, Greenwich. Even though 98% of Great Britain's public clocks were using GMT by 1855, it was not made Britain's legal time until August 2, 1880. Some British clocks from this period have two minute hands—one for the local time, one for GMT. Improvements in worldwide communication further increased the need for interacting parties to communicate mutually comprehensible time references to one another.

The problem of differing local times could be solved across larger areas by synchronizing clocks worldwide, but in many places that adopted time would then differ markedly from the solar time to which people were accustomed. On November 2, 1868, the then British colony of New Zealand officially adopted a standard time to be observed throughout the colony, and was perhaps the first country to do so. It was based on the longitude 172°30′ East of, that is 11 hours 30 minutes ahead of GMT.