What is the definition of a standard time zone?

Answer 1

Here's one from each of six continents:

A large part on North and Central America use Central Standard Time (UTC - 6 hours). Central America and parts of Canada use it all year, much of Canada, the United States, and ten Mexican cities along the U. S. border use it from November to March, and most of Mexico uses it from October to April.

A large part of Brazil uses Brasilia Time (UTC - 3 hours). Some states use it all year, and some states use it only from February to October.

A large part of Europe uses Central European Time (UTC + 1 hour) from October to March.

Seven and a half African countries, including Rwanda, Zimbabwe, and the eastern half of the Democratic Republic of the Congo use Central Africa Time (UTC + 2 hours) all year.

Thailand, Vietnam, Cambodia and Laos use Indochina Time (UTC + 7 hours) all year.

About a third of Australia uses Central Standard Time (UTC + 9.5 hours). The Northern Territory uses it all year, and the State of South Australia and a small part of New South Wales use it only from April to October.

When places are not using Standard Time, they are using what North America calls Daylight Saving Time and what South America, Europe, Africa and Australia calls Summer Time.

Answer 2

CentralAtlanticPacificAlaskaMountainHawaiiRomeGreenwich Mountian(GMT)
I HAVE ONLY EIGHT
Standard Time Zones:

• American Samoa Standard Time (UTC-11)
• Niue Time (UTC-11)
• Hawaii-Aleutian Standard Time (UTC-10) *
  
• Tahiti Time (UTC-10)
• Cook Islands Time (UTC-10)
• Marquesas Time (UTC-9:30)
• Alaska Standard Time (UTC-9) **
  
• Gambier Time (UTC-9)
• Metlakatla Time (UTC-8)
• Pacific Standard Time (UTC-8) **
  
• Pitcairn Standard Time (UTC-8)
• Mountain Standard Time (UTC-7) *
• Central Standard Time (UTC-6) *
• Galapagos Time (UTC-6)
• Easter Island Time (UTC-6) **
• Eastern Standard Time (UTC-5) *
• Cuba Standard Time (UTC-5) **
• Colombia Time (UTC-5)
• Ecuador Time (UTC-5)
• Peru Time (UTC-5)
• Venezuelan Standard Time (UTC-4:30)
• Atlantic Standard Time (UTC-4) *
• Guyana Time (UTC-4)
• Amazon Time (UTC-4) *
• Bolivia Time (UTC-4)
• Paraguay Time (UTC-4) **
• Chile Time (UTC-4) **
• Newfoundland Standard Time (UTC-3:30) **
• Western Greenland Time (UTC-3) **
• Pierre and Miquelon Standard Time (UTC-3) **
• Suriname Time (UTC-3)
• French Guiana Time (UTC-3)
• Brasilia Time (UTC-3) *
• Argentina Time (UTC-3)
• Uruguay Time (UTC-3) **
• Falkland Islands Summer Time (UTC-3)
• Rothera Time (UTC-3)
• Fernando de Noronha Time (UTC-2)
• South Georgia Time (UTC-2)
• Eastern Greenland Time (UTC-1) **
• Azores Time (UTC-1) **
• Cape Verde Time (UTC-1)
• Greenwich Mean Time (UTC) *
• Western European Time (UTC) *
• Central European Time (UTC+1) *
• West Africa Time (UTC+1) *
• Eastern European Time (UTC+2) *
• Israel Standard Time (UTC+2) **
• Central Africa Time (UTC+2)
• South Africa Standard Time (UTC+2)
• Kaliningrad Time (UTC+3)
  
• Further-Eastern European Time (UTC+3)
• Arabia Standard Time (UTC+3)
• East Africa Time (UTC+3)
• Syowa Time (UTC+3)
• Iran Standard Time (UTC+3:30) **
• Moscow Time (UTC+4)
• Georgia Time (UTC+4)
• Armenia Time (UTC+4)
• Azerbaijan Time (UTC+4) **
• Gulf Standard Time (UTC+4)
• Seychelles Time (UTC+4)
• Mauritius Time (UTC+4)
• Réunion Time (UTC+4)
• Afghanistan Time (UTC+4:30)
• Aqtobe Time (UTC+5)
• Oral Time (UTC+5)
• Uzbekistan Time (UTC+5)
• Turkmenistan Time (UTC+5)
• Tajikistan Time (UTC+5)
• Pakistan Time (UTC+5)
• Maldives Time (UTC+5)
• French Southern and Antarctic Time (UTC+5)
• Mawson Time (UTC+5)
• India Standard Time (UTC+5:30)
• Nepal Time (UTC+5:45)
• Yekaterinburg Time (UTC+6)
• Alma-Ata Time (UTC+6)
• Qyzylorda Time (UTC+6)
• Kyrgyzstan Time (UTC+6)
  
• Bhutan Time (UTC+6)
• Bangladesh Standard Time (UTC+6)
• Indian Chagos Time (UTC+6)
• Vostok Time (UTC+6)
• Myanmar Time (UTC+6:30)
• Cocos Islands Time (UTC+6:30)
• Omsk Time (UTC+7)
• Hovd Time (UTC+7)
• Indochina Time (UTC+7)
• Western Indonesian Time (UTC+7)
• Christmas Island Time (UTC+7)
• Davis Time (UTC+7)
• Krasnoyarsk Time (UTC+8)
• Ulaanbaatar Time (UTC+8)
• Choibaisan Time (UTC+8)
• Beijing Time (UTC+8)
• Hong Kong Time (UTC+8)
• Philippine Time (UTC+8)
• Brunei Darussalam Time (UTC+8)
• Malaysia Time (UTC+8)
• Singapore Time (UTC+8)
• Central Indonesian Time (UTC+8)
• Australian Western Standard Time (UTC+8)
• Central Western Standard Time (UTC+8:45)
• Irkutsk Time (UTC+9)
• Korea Standard Time (UTC+9)
• Japan Standard Time (UTC+9)
• Palau Time (UTC+9)
• Eastern Indonesian Time (UTC+9)
• East Timor Time (UTC+9)
• Australian Central Standard Time (UTC+9:30) *
  
• Yakutsk Time (UTC+10)
  
• Chamorro Standard Time (UTC+10)
• Yap Time (UTC+10)
• Chuuk Time (UTC+10)
• Papua New Guinea Time (UTC+10)
• Australian Eastern Standard Time (UTC+10) *
• Dumont-d'Urville Time (UTC+10)
• Lord Howe Standard Time (UTC+10:30) **
• Vladivostok Time (UTC+11)
• Pohnpei Time (UTC+11)
• Kosrae Time (UTC+11)
• Solomon Islands Time (UTC+11)
• Vanuatu Time (UTC+11)
• New Caledonia Time (UTC+11)
• Macquarie Island Time (UTC+11)
• Norfolk Time (UTC+11:30)
• Magadan Time (UTC+12)
• Wake Time (UTC+12)
• Marshall Islands Time (UTC+12)
• Gilbert Islands Time (UTC+12)
• Nauru Time (UTC+12)
• Tuvalu Time (UTC+12)
• Wallis and Futuna Time (UTC+12)
• Fiji Time (UTC+12) **
• New Zealand Standard Time (UTC+12) **
• Chatham Islands Standard Time (UTC+12:45) **
• Phoenix Islands Time (UTC+13)
• Tokelau Time (UTC+13)
• Samoa Standard Time (UTC+13) **
• Tonga Time (UTC+13)
• Line Islands Time (UTC+14)

* One asterisk indicates that part(s) of the time zone switch(es) to Summer Time or Daylight Saving Time for part of each year.

** Two asterisks indicate that the whole time zone switches to Summer Time or Daylight Saving Time for part of each year.

I count 142 time zones, with 39 different offsets from Coordinated Universal Time (UTC).

Answer 3

Central Standard Time is the North American time zone where the time is UTC - 6 hours and which includes...

• Belize,
• most of Saskatchewan, Canada,
• parts of Nunavut & Ontario, Canada from the 1st Sun. of Nov. to the 2nd Sun. of Mar.,
• Costa Rica,
• Guatemala,
• Honduras,
• the Mexican states of Aguascalientes, Campeche, Chiapas, Colima (except Clarion Is.), Durango, Guanajuato, Guerrero, Hidalgo, Jalisco, Mexico, Michoacán, Morelos, Oaxaca, Puebla, Queretaro, Quintana Roo, San Luis Potosi, Tabasco, Tlaxcala, Veracruz, Yucatan & Zacatecas, the Mexican Federal District, & parts of the Mexican states of Coahuila, Nuevo Leon & Tamaulipas from the last Sun. of Oct. to the 1st Sun. of Apr.,
• parts of the Mexican states of Coahuila, Nuevo Leon & Tamaulipas from the 1st Sun. of Nov. to the 2nd Sun. of Mar.,
• Nicaragua,
• El Salvador, &
• the U.S. states of Alabama, Arkansas, Illinois, Iowa, Louisiana, Minnesota, Mississippi, Missouri, Oklahoma & Wisconsin & parts of the U.S. states of Florida, Indiana, Kansas, Kentucky, Michigan, Nebraska, North Dakota, South Dakota, Tennessee & Texas from the 1st Sun. of Nov. to the 2nd Sun. of Mar.

Central Standard Time, also known as Australian Central Standard Time, is also the Australian time zone where the time is UTC + 9.5 hours and which includes...

• Northern Territory
• South Australia & Yancowinna County, New South Wales from the 1st Sun. of Apr. to the 1st Sun. of Oct.

Answer 4

A standard time zone is a geographical (most often geopolitical) zone throughout which the time has been standardized to the same setting. Before standard time zones were introduced in the 19th century, each city had its own time setting, with noon being when the sun was at its highest point in the sky as seen from that city. As transportation and communication became much faster, the need for a less confusing system became much stronger.

"Standard Time" is also used to specify the winter time setting in places that observe "Summer Time" or "Daylight Saving Time" during part of the year.

Answer 5

Areas which have same time currently (UTC -6:00). Central Standard Time. Currently has same time zone offset as CST (UTC -6:00) but different time zone name. Central Standard Time(CST) is 6 hours behind Coordinated Universal Time(UTC).

Answer 6

A time zone is an area on Earth throughout which clock settings have been standardized to the same time.

Answer 7

A standard time zone is a geographical area throughout which clock time is the same by agreement, despite how much actual local mean time varies across the area.

Answer 8

The Prime Meridian