What time is it? Nowadays there is only one correct answer to this question. This was not always true.
In 1859 a man in Dorset lost a court case because he was late. The court used Greenwich time. He used local time.
Even in small countries like Britain the local time varies a lot from place to place. Noon in Dorset is 17 minutes later than it is in London.
It was the development of the railways in the nineteenth century which made a national system of time keeping necessary. In 1880 the time at the Greenwich Observatory in London became the legal time for Britain.
Today GMT is the basis of time keeping all over the world. Nearly all countries have a national system which is so many hours ahead of or behind Greenwich.
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