A time zone is a designated area of the globe that observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries of countries and their subdivisions instead of strictly following longitude because it is convenient for areas in close commercial or other communication to keep the same time. France, including its overseas territories, has the most time zones of any country, with a total of 12.
The Eastern Time Zone (ET) is a time zone encompassing part or all of 23 states in the eastern part of the United States, parts of eastern Canada, the state of Quintana Roo in Mexico, Panama in Central America, and Colombia, mainland Ecuador, Peru, and a small portion of westernmost Brazil in South America, along with certain Caribbean and Atlantic islands.
Summer time in Europe is the variation of standard clock time that is applied in most European countries in the period between spring and autumn, during which clocks are advanced by one hour from the time observed in the rest of the year, with a view to making the most efficient use of seasonal daylight. It corresponds to the notion and practice of daylight saving time (DST) to be found in many other parts of the world.
Eastern European Time (EET) is one of the names of UTC+02:00 time zone, 2 hours ahead of Coordinated Universal Time. The zone uses daylight saving time, so that it uses UTC+03:00 during the summer.
Moscow Time is the time zone for the city of Moscow, Russia, and most of western Russia, including Saint Petersburg. It is the second-westernmost of the eleven time zones of Russia. It has been set to UTC+03:00 without DST since 26 October 2014; before that date it had been set to UTC+04:00 year-round on 27 March 2011.
UTC+03:00 is an identifier for a time offset from UTC of +03:00. In areas using this time offset, the time is three hours later than the Coordinated Universal Time (UTC). Following the ISO 8601 standard, a time with this offset would be written as, for example, 2019-02-08T23:36:06+03:00.
UTC+05:00 is an identifier for a time offset from UTC of +05:00. This time is used in:
UTC+04:00 is an identifier for a time offset from UTC of +04:00. In ISO 8601 the associated time would be written as 2019-02-07T23:28:34+04:00. This time is used in:
Pakistan Standard Time is UTC+05:00 hours ahead of Coordinated Universal Time. The time zone is in use during standard time in Asia.
Omsk Time (OMST) is a time zone in Russia that is six hours ahead of UTC (UTC+06:00), and 3 hours ahead of Moscow Time (MSK).
There are eleven time zones in Russia, which currently observe times ranging from UTC+02:00 to UTC+12:00. Daylight saving time is not used in Russia. From 27 March 2011 to 26 October 2014, permanent DST was used.
Further-eastern European Time (FET) is a time zone defined as three hours ahead of UTC (UTC+03:00) without daylight saving time, the zone immediately higher than the Eastern European Time. The time zone used in Belarus between 2011-2014.
Bangladesh Standard Time (BST) is the time zone of Bangladesh. It is offset six hours ahead of Coordinated Universal Time, and observed as a national standard throughout the country. Bangladesh briefly observed daylight saving time (DST) in 2009 to cope with the ongoing electricity crisis, but in 2010 the decision was cancelled by the government of Bangladesh.
Mexico uses four main time zones since February 2015. Most of the country observes Daylight Saving Time.
- Zona Sureste covers the state of Quintana Roo is UTC-05:00 year round. It is the equivalent of U.S. Eastern Standard Time.
- Zona Centro covers the eastern three-fourths of Mexico, including Mexico City, Guadalajara and Monterrey. For most of the year, it is the equivalent of U.S. Central Time.
- Zona Pacífico covers the states of Baja California Sur, Chihuahua, Nayarit, Sinaloa, and Sonora. For most of the year, it is the equivalent of U.S. Mountain Time. The state of Sonora, like the U.S. state of Arizona, does not observe daylight saving time.
- Zona Noroeste covers the state of Baja California. It is identical to U.S. Pacific Time, including the daylight saving time schedule.
Azerbaijan Time, abbreviated as AZT, is the standard time zone in Azerbaijan, four hours ahead of UTC (UTC+04:00). The daylight saving time adjustment, Azerbaijan Summer Time (AZST), was one hour ahead at UTC+05:00 and was discontinued in March 2016.
Irkutsk Time (IRKT) is the time zone eight hours ahead of UTC (UTC+08:00) and 5 hours ahead of Moscow Time (MSK+5).
Yakutsk Time (YAKT) is a time zone in Russia which is nine hours ahead of UTC, and six hours ahead of Moscow Time (MSK).
Vladivostok Time (VLAT), is a time zone in Russia, named after the city of Vladivostok. It is ten hours ahead of UTC (UTC+10:00) and seven hours ahead of Moscow Time (MSK+7).
Kaliningrad Time is the time zone two hours ahead of UTC (UTC+02:00) and 1 hour behind Moscow Time (MSK−1). It is used in Kaliningrad Oblast.
As of 2017, daylight saving time is used in the following Asian countries:
