Chaitanya's Random Pages

January 31, 2013

Some noteworthy time zones

Filed under: geography — ckrao @ 11:10 am

I was recently learning about time zones and thought I would collect some notes about some of the more interesting ones here. In total there are 40 time zones spanning the globe.

  • UTC – 12:00: Nobody lives here (it covers the uninhabited US islands of Baker Island and Howland Island in the Pacific)
  • UTC -11:00: Samoa used to be in this time zone but it switched to UTC+13, skipping 30 December 2011 in the process.
  • UTC -9:30: Only covered by the Marquesas Islands (French Polynesia), population ~9,000.
  • UTC -4:30: Used in Venezuela since December 9 2007 (previously used UTC -4:00)
  • UTC -3:30: Used in southeastern Labrador and Newfoundland, Canada
  • UTC -1:00: Used in Cape Verde, eastern Greenland (in winter) and the Azores (Portugal, in winter)
  • UTC +3:30: Used by Iran in winter
  • UTC +4:30: Used by Afghanistan and Iran (in summer)
  • UTC +5:30: Used in India and Sri Lanka, the world’s second most populated time zone
  • UTC +5:45: Used in Nepal since 1986
  • UTC +6:30: Used in Myanmar and Cocos Islands (Australia)
  • UTC +8:45: Unofficial time zone used in Eucla and surrounds, Western Australia, population ~200
  • UTC +9:30: Used in Northern Territory, South Australia (winter), western New South Wales around Broken Hill (winter) (all in Australia)
  • UTC +10:30: Used in Lord Howe Island, South Australia (summer), western New South Wales around Broken Hill (summer) (all in Australia)
  • UTC +11:30: Used in Norfolk Island (Australia)
  • UTC +12:45: Used in Chatham Islands (New Zealand)
  • UTC +14:00: The highest time zone (used by the Line Islands of Kiribati)

Here are the time zones used in the past but not at present.

  • UTC -10:30: Used by Hawaii from 1900 to 1947 (now UTC -10:00)
  • UTC -8:30: Used in Pitcairn Islands (UK) until 1998 (now UTC -8:00)
  • UTC -0:44: Used in Liberia from 1919 to 1972 (now UTC 0:00)
  • UTC -0:25: Used in Ireland from 1880 to 1916 (now UTC 0:00 in winter)
  • UTC +0:20: Used in Netherlands from 1909 to 1940 (now UTC +1:00 in winter)
  • UTC +0:30: Sandringham time used in the British royal household, 1901-1936
  • UTC +1:30: Was used in present-day Nambia and parts of South Africa, 1892-1903
  • UTC +2:30: Was used in Moscow in late 19th century (now UTC +4:00 in winter)
  • UTC +4:51: Used as Bombay time (India) until 1951
  • UTC +7:20: Was used as daylight saving time in Singapore between 1933 and 1940
  • UTC +7:30: Used in Singapore before 1970 (now UTC +8:00)
  • UTC +8:30: Formerly used in north eastern China and South Korea
  • UTC +9:45: Unofficially used in Eucla and surrounds (Australia, see above) in summer when Western Australia had daylight saving


[1] Time zone (Wikipedia)

[2] List of time zones by UTC offset (Wikipedia)

1 Comment »

  1. All is correct.For Ireland :UTC -0:25,Eucla:UTC+9:45,north eastern China ,South Korea UTC +8:30,Netherlands :UTC+0:20.Etc……

    Comment by Remi Acien — November 20, 2017 @ 6:32 pm | Reply

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