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Australia uses three main time zones, Australian Western Standard Time (AWST; UTC+08:00), Australian Central Standard Time (ACST; UTC+09:30), and Australian Eastern Standard Time (AEST; UTC+10:00). Time is regulated by the individual state governments,〔(Daylight Saving in New South Wales ) ''Lawlink NSW''. Retrieved 28 January 2012〕 some of which observe daylight saving time (DST). Australia's external territories observe different time zones. Standard time was introduced in the 1890s when all of the Dominions adopted it. Before the switch to standard time zones, each local city or town was free to determine its local time, called local mean time. Now, Western Australia uses Western Standard Time; South Australia and the Northern Territory use Central Standard Time; while New South Wales, Queensland, Tasmania, Victoria, and the Australian Capital Territory (ACT) use Eastern Standard Time. Daylight saving time is used in South Australia, New South Wales, Victoria, Tasmania, and the ACT. It is not currently used in Western Australia, Queensland and the Northern Territory. ==History== The standardization of time in Australia began in 1892, when surveyors from the six Dominions in Australia met in Melbourne for the Intercolonial Conference of Surveyors. The delegates accepted the recommendation of the 1884 International Meridian Conference to adopt Greenwich Mean Time (GMT) as the basis for standard time. The Dominions enacted time zone legislation, which took effect in February 1895. The clocks were set ahead of GMT by eight hours in Western Australia; by nine hours in South Australia (and the Northern Territory, which it governed); and by 10 hours in Queensland, New South Wales, the Dominion of Victoria and Tasmania. The three time zones became known as ''Eastern Standard Time'', ''Central Standard Time'', and ''Western Standard Time''. Broken Hill in the far west of New South Wales also adopted Central Standard Time due to it being connected by rail to Adelaide but not Sydney at the time.〔 In May 1899, South Australia advanced Central Standard Time by thirty minutes, disregarding the common international practice of setting one-hour intervals between adjacent time zones. In doing so, South Australia also adopted a time meridian located outside its boundaries - another departure from international convention. Attempts to correct these oddities in 1986 and 1994 were rejected. When the Northern Territory was separated from South Australia and placed under the jurisdiction of the Federal Government, that Territory kept Central Standard Time. Likewise, when the ACT was broken off from New South Wales, it retained Eastern Standard Time. Since 1899, the only major changes in Australian time zones have been the setting of clocks to one-half hour earlier than Eastern time (GMT plus 10:30) on the territory of Lord Howe Island, and Norfolk Island changing from UTC+11:30 to UTC+11:00 on 4 October 2015. When abbreviating "Australian Central Time" and "Australian Eastern Time", in domestic contexts the leading "Australian" may be omitted, however the prefix "A" is often used to avoid ambiguity with the time zone abbreviations "CST" and "EST" referring to the Central and Eastern Time Zones in North America. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Time in Australia」の詳細全文を読む スポンサード リンク
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