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__NOTOC__ New Zealand has two time zones. The main islands use New Zealand Standard Time (NZST), 12 hours in advance of Coordinated Universal Time (UTC) /Military M (MIKE),〔(Military Time Zone map )〕 while the outlying Chatham Islands use Chatham Standard Time (CHAST), 12 hours 45 minutes in advance of UTC /Military M^ (MIKE-THREE).〔 UTC is designated as Military and Aircraft Time Zone Z (ZULU), sometimes referred to as ZERO (as in Zero-Hour offset).〔 During summer (last Sunday in September until the first Sunday in April) daylight saving time is observed and clocks are advanced one hour. New Zealand Daylight Time (NZDT) is 13 hours ahead of UTC, and Chatham Daylight Time (CHADT) 13 hours 45 minutes ahead. The Ross Dependency, McMurdo Station and the Amundsen–Scott South Pole Station in Antarctica maintain NZST/NZDT. There are dependencies of New Zealand in the Pacific Ocean, in three different time zones, two of them on the other side of the International Date Line: * The Cook Islands are in the UTC−10:00 time zone /Military W (WHISKEY) 〔 and do not observe daylight saving time. Clocks in the Cook Islands are 22 or 23 hours behind New Zealand: at noon on Thursday in New Zealand, it is 1 pm or 2 pm on Wednesday in the Cook Islands. * Niue is in the UTC−11:00 time zone /Military X (X-RAY) 〔 and does not observe daylight saving time. Clocks in Niue are 23 or 24 hours behind New Zealand: at noon on Thursday in New Zealand, it is noon or 1 pm on Wednesday in Niue. * Tokelau is in the UTC+13:00 time zone 〔(Tokelau in wrong time zone? ), Time zone database.〕 /Military M' (MIKE Prime)〔 and does not observe daylight saving time. Clocks in Tokelau are set to the same time as or 1 hour ahead of New Zealand: at noon on Thursday in New Zealand, it is noon or 1 pm on Thursday in Tokelau. ==History== On 2 November 1868, New Zealand officially adopted a standard time to be observed nationally, and was perhaps the first country to do so. It was based on longitude 172°30′ East of Greenwich, 11½ hours ahead of Greenwich Mean Time (GMT). This standard was known as New Zealand Mean Time (NZMT). In 1941, during the Second World War, clocks were advanced half an hour, making New Zealand 12 hours ahead of GMT. This change was made permanent from 1946 by the Standard Time Act 1945, at which the time at the 180°E meridian was made the basis for New Zealand Time. NZST remained half an hour ahead of NZMT, and the Chatham Islands 45 minutes ahead of NZST. In the late 1940s the atomic clock was developed and several laboratories began atomic time scales. A new time scale known as Coordinated Universal Time (UTC) was adopted internationally in 1972. This was based on the readings of atomic clocks, updated periodically in accordance with time variations in the Earth's rotation by the addition or deletion of seconds (called leap seconds). The ''Time Act 1974'' defines New Zealand Standard Time as 12 hours in advance of UTC. In 2011, Tokelau moved its time zone forward by 24 hours, by skipping 30 December. This followed a similar decision by Samoa, as the only way to travel to Tokelau is by boat from Samoa. This has the result of putting Tokelau on the same date as New Zealand. 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 New Zealand」の詳細全文を読む スポンサード リンク
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