![]() Eventually the rest of the world began to use this system, shaping the time zones we know today. Other countries created their own standard times and, in the late 1880s, the International Meridian Conference proposed a standardised 24-hour day, starting off at midnight GMT. However, in 1855, the Royal Greenwich Observatory started transmitting time signals and in 1880, the Greenwich Mean Time (GMT) became the country’s official standard time. In 1847, British railway companies began to standardize the time they were using by providing their staff with portable chronometers, resulting in what became known as ‘Railway Time’. A better system was required to enable an efficient operation of railways and new telecommunication systems. Since the time calculations were based on the position of the sun, they could vary by four minutes for each degree of longitude. ![]() In the nineteenth century, when mechanical clocks began to become popular, time was calculated locally. UTC−04:00 ( AST) - Puerto Rico, the U.S.Time has traditionally been measured according to the position of the sun in the sky, which is different depending on where you are in the world. UTC−05:00 ( ET) - Eastern Time zone: roughly a triangle covering all the states from the Great Lakes down to Florida and east to the Atlantic coast Many countries also have Daylight Saving Time (DST) for part of the year, the time service will automatically switch to this at the appropriate time unless DST has been disabled. UTC−06:00 ( CT) - Central Time zone: a large area spanning from the Gulf Coast to the Great Lakes UTC−07:00 ( MT) - Mountain Time zone: most of Idaho, part of Oregon, and the Mountain states plus western parts of some adjacent states UTC−08:00 ( PT) - Pacific Time zone: the Pacific coast states, the Idaho Panhandle and most of Nevada and Oregon UTC−09:00 ( AKT) - most of the state of Alaska UTC−10:00 ( HT) - Hawaii, most of the Aleutian Islands, and Johnston Atoll UTC−11:00 ( ST) - American Samoa, Jarvis Island, Kingman Reef, Midway Atoll and Palmyra Atoll UTC−12:00 (AoE) - Baker Island and Howland Island UTC+12:00 ( Kamchatka Time) - Chukotka and Kamchatka Krai UTC+11:00 ( Magadan Time) - Magadan Oblast, eastern Sakha, and Sakhalin Oblast UTC+10:00 ( Vladivostok Time) - Jewish Autonomous Oblast, Khabarovsk Krai, Primorsky Krai, and central Sakha Republic UTC+09:00 ( Yakutsk Time) - Amur Oblast, western Sakha Republic, and Zabaykalsky Krai UTC+08:00 ( Irkutsk Time) - Buryatia and Irkutsk Oblast UTC+07:00 ( Krasnoyarsk Time) - Altai Krai, Altai Republic, Kemerovo Oblast, Khakassia, Krasnoyarsk Krai, Novosibirsk Oblast, Tomsk Oblast, and Tuva UTC+05:00 ( Yekaterinburg Time) - Bashkortostan, Chelyabinsk Oblast, Khanty–Mansia, Kurgan Oblast, Orenburg Oblast, Perm Krai, Sverdlovsk Oblast, Tyumen Oblast, and Yamalia UTC+04:00 ( Samara Time) - Astrakhan Oblast, Samara Oblast, Saratov Oblast, Udmurtia, and Ulyanovsk Oblast UTC+03:00 ( Moscow Time) - Most of European Russia UTC+02:00 ( Kaliningrad Time) - Kaliningrad Oblast UTC+05:00 - Kerguelen Islands, Saint Paul and Amsterdam Islands UTC+03:00 - Mayotte, Scattered Islands in the Indian Ocean UTC−03:00 (PMST)- French Guiana, Saint Pierre and Miquelon UTC−04:00 ( AST) - Guadeloupe, Martinique, Saint Barthélemy, Saint Martin The time in China follows a single standard time offset of UTC+08:00 (eight hours ahead of Coordinated Universal Time), even though China spans almost five geographical time zones.The official national standard time is called Beijing Time (BJT, Chinese: ) domestically and China Standard Time (CST) internationally. UTC−10:00 - Society Islands, Tuamotus, Austral Islands The UTC offset in the list is not valid in practice during daylight saving time. Many countries have daylight saving time, one added hour during the local summer, but this list does not include that information. France, including its overseas territories, has the most time zones with 12 (13 including its claim in Antarctica). Time zones of a country include that of dependent territories (except Antarctic claims). Countries are ranked by total number of time zones on their territory. This is a list representing time zones by country. See also: Daylight saving time by country
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