See also: Time Spindle,

Un' spindle horaire' is a zone of the surface Ground stre where the adopted hour is identical in any point. Generally, a time zone follows the average hour more or less of the central Méridien.

This system was proposed by the engineer and geographer Montréalais Sir Sandford Fleming in 1876, with the meridian line of Greenwich like origin of times, the Date-line to the meridian line 180° (is and western), and by dividing the sphere of 24 of the same time zones cuts.

The legal schedules are based on the universal Time coordinated (UTC), to which is added or withdrawn a certain number of hours. They do not correspond today however inevitably to the original time zones, because of a certain number of adaptations :

  • a country generally has only one Standard time even if it is with horse on several spindles (it is the case of the China and the India)   ;
  • Certains large countries (the United States, Russia, Canada, Australia, Brazil, RD Congo, Indonesia etc) are arbitrarily divided into several zones in order to avoid a too great difference between the standard time and the solar hour. It is also the case of certain distant dependences (such as for example DOM-TOM French, the the Portuguese Azores, etc)   ;
  • a country can adopt one hour other than that which to him would be intended a priori . In fact the case of the continental Spain (except in the Canaries which is located a time zone earlier) or French Métropole is per hour of the Central Europe (hour of Berlin since 1940)   ;
  • certain countries chose one hour not corresponding to an original spindle (Afghanistan with UTC+4: 30 or Iran with UTC+3: 30)   ;
  • a part of the world knows a Summer-time and a Heure of winter , created to carry out energy saving (and sometimes criticized).

Consequently, the worldwide of the sphere at present uses 41 time zones (by counting UTC+8: 45 which is not an official spindle), including 36 all the year (but not inevitably by the same countries), two only at the boreal hour of winter (UTC-3: 30 and UTC+3: 30), only at the southern hour of winter (UTC+12: 45), exclusively at the boreal summer-time (UTC-2: 30), the last only at the southern summer-time (UTC+13: 45).

Usual time zones

The following paragraphs detail the countries and territories using each time zone.

The marked areas of an asterisk (* in the northern hemisphere, ** in the southern hemisphere) are those which observe the Summer-time: +1h00 in be. In this case, the time zone indicated is that in which the area is when it does not apply the summer-time. In Europe, the passage to the summer-time is made with the morning the last Sunday of the Mois of March and the passage to the Heure of winter, in the morning of last Sunday of October), in both cases with 1:00 UTC. In North America, the passage to the summer-time is made Sunday of the second week of the month of March, at 2 hours of the morning, and the passage per hour of winter Sunday of the first week of November.

The expressions used to define certain time zones (“Central Europe Time”, for example) do not have anything official and are generally transfers of English traditional expressions.

UTC-12

  • the United States:
    • Island Baker
    • Island Howland

UTC-11

  • Designations:
    • ST, Standard Samoa Time (standard hour of the Samoa)

UTC-10 (HST)

  • Designations:
    • HST, Standard Hawaii-Aleutian Time (standard hour of Hawaii and the Aleutian Islands)

UTC-9h30

UTC-9 (AKST)

  • Designations:
    • AKST, Standard Alaska Time (standard hour of Alaska)

UTC-8 (PST)

  • Designations:
    • PST, Standard Pacific Time (standard hour of the Pacific)
    • HNP, normal Hour of the Pacific (in Canada)

  • Canada:

  • the United States:
    • California *
    • Idaho * (to the North of the Salmon To rivet and to the West of the border enters the counties of the Idaho and Lemhi)
    • Nevada * (almost entirely, except West Wendover and frontier cities with Idaho)
    • Oregon * (almost entirely, except 1/5 of the Comté of Misfortune and frontier cities with Idaho)
    • Washington *
  • France:
    • Clipperton
  • Mexico:
    • Low-California of North *
  • the United Kingdom:
    • Islands Pitcairn

UTC-7 (MST)

  • Designations:
    • MST, Standard Mountain Time (standard hour of the Mountains, the Rock ones)
    • HNR, normal Hour of Rock (in Canada) the

  • Canada:

    • Alberta *
    • Colombia-British:
        • North-eastern
      • (most of the regional district of the Peace To rivet , except Strong Ware, Beatton To rivet, Pink Mountain, Sikanni Chief, Buckinghorse To rivet and Trutch)
      • Sud-Est*:
        • regional District of East Kootenay
        • regional District of Kootenay Exchange in the East of the river Kootenay and certain parts in the East of the Lake Kootenay in the South of Riondel, included (Creston does not observe the summer-time however)
        • regional District Columbia-Shuswap in the East of the Monts Selkirk
    • Territoires of the North-West *
    • Nunavut *:
        • Western
      • of 102° of Western longitude
      • Area of Kitikmeot
    • Saskatchewan:
      • Area of Lloydminster * (in particular excluded from the prohibition of the valid summer-time in the remainder of the province)
  • the United States:
  • Mexico:

UTC-6 (CST)

  • Designations:
    • CST, Central Standard Time (standard hour of the Center)
    • HNC, normal Hour of the Center (in Canada)

UTC-5 (IS or AND)

  • Designations:
    • IS, Eastern Standard Time (standard hour of the East of North America)
    • HNE, normal Heure of the East (in Canada)

  • Brazil *:

    • Acre
    • Amazonas (extreme south-west)

UTC-4 (AST)

  • Designations:
    • AST, Standard Atlantic Time (standard hour of the Atlantic)
    • HNA, normal Hour of the Atlantic (in Canada)

UTC-3h30

  • Designations:
    • NST, Standard Newfoundland Time (standard hour of Newfoundland)
    • HNT, normal Hour of Newfoundland (in Canada)

UTC-3

UTC-2

UTC-1

UTC (WET, GMT )

UTC+1 (THIS)

  • Designations:
    • THIS, Central European Time (hour of the Central Europe), in French HNEC, normal hour of the Central Europe
    • CEST, Central European Summer Time (summer-time of the Central Europe), in French HAEC, advanced hour of the Central Europe, during the summer-time for the countries of Europe applying this one (corresponds to UTC+2).
    • MET, Middle European Time

UTC+2 (EET)

UTC+3

UTC+3h30

UTC+4

UTC+4h30

UTC+5

UTC+5h30

UTC+5h45

UTC+6

UTC+6h30

UTC+7

UTC+8 (AWST)

  • Designations:
    • AWST, Australian Western Standard Time (standard hour of Western Australia)

UTC+8h45

UTC+9

UTC+9h30 (ACST)

  • Designations:
    • ACST, Central Australian Standard Time , (standard hour of central Australia)

UTC+10 (AEST)

  • Designations:
    • AEST, Australian Eastern Standard Time (standard hour of Eastern Australia)

UTC+10h30

UTC+11

UTC+11h30

UTC+12

UTC+12h45

UTC+13

UTC+14

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