Dowd about 1863 for American railroads as a teacher to his students. Multiple time zones were first proposed by Charles F. This standard was known as New Zealand Mean Time. It was based on the longitude 172? 30' East of Greenwich, that is 11 hours 30 minutes ahead of Greenwich Mean Time. On November 2, 1868, New Zealand officially adopted a standard time to be observed nationally, and was perhaps the first country to do so. This paragraph only applies to the island of Great Britain, not to the island of Ireland. Even though 98% of the Great Britain's public clocks were using GMT by 1855, it was not made Britain's legal time until August 2, 1880. About August 23, 1852, time signals were first transmitted by telegraph from the Royal Greenwich Observatory. The first time zone in the world was established by British railways on December 1, 1847- Greenwich Mean Time (GMT) being hand carried on chronometers. See also: Sidereal time Calculating local time Contents New Zealand which is usually UTC + 12, observes a one-hour daylight saving time adjustment during the southern hemisphere summer resulting in a local time of UTC + 13! Note: The time zone adjustment for a specific location may vary due to the use of daylight saving time. if it is 06:00 UTC on Monday 1 May, then the time in Honolulu is 20:00, Sunday 30 April) Honolulu, Hawai'i, USA: UTC − 10 (e.g.if it is 02:00 UTC on Tuesday, then the time in NY is 21:00 on Monday) if it is 21:00 UTC on Wednesday 30 June, then the time in Auckland is 09:00, Thursday 1 July)
if it is 23:00 UTC on Monday 15 March, then the time in Cairo is 01:00, Tuesday 16 March) Where the adjustment for time zones results in a time the other side of midnight from UTC, then the date at the location is one day later or earlier. if it is 11:00 UTC, then it is 20:00 in Tokyo) if it is 13:00 UTC, then it is 18:30 in Mumbai)
if it is 03:00 UTC, then it is 05:00 in Istanbul) if it is 12:00 UTC, then it is 13:00 in Stockholm) if it is 11:00 UTC, then it is 06:00 in Toronto)
Toronto, Ontario, Canada: UTC − 5 (e.g.if it is 12:00 UTC, then it is 04:00 in Los Angeles) Los Angeles, California, USA: UTC − 8 (e.g.The time for a location is given relative to UTC. For the remainder of the year local time is UTC + 1-known in the UK as British Summer Time (BST). GMT (UTC) is, incidentally, local time at Greenwich itself only between 01:00 UTC on the last Sunday in October and 01:00 UTC on the last Sunday in March. UTC is, nevertheless, the official term for today's atomically measured time as distinct from time determined by astronomical observation as formerly carried out at Greenwich. For this reason the term Greenwich Mean Time ( GMT) is still often used (by the BBC, for example, amongst others) to denote the "base time" to which all other time zones are relative. The reference point for Time Zones is the Prime Meridian ( longitude 0?) which passes through the Royal Greenwich Observatory in Greenwich, London, United Kingdom ( ). Standard Time Zones of the World by the CIAĪll time zones are defined relative to Coordinated Universal Time (UTC).
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