World map with the time zone highlighted
|12:58, 3 May 2020 UTC−06:00|
|90 degrees W|
|Mexican time zone||Winter||Summer (DST)||North American equivalent|
|Zona Sureste||UTC−05:00||Eastern Standard Time|
|Zona Centro||UTC−06:00||UTC−05:00||Central Time|
|Zona Pacífico||UTC−07:00||UTC−06:00||Mountain Time|
|Zona Pacífico||UTC−07:00||Mountain Standard Time|
|Zona Noroeste||UTC−08:00||UTC−07:00||Pacific Time|
|Standard||DST||US time zone|
|Red and pink||UTC−06:00||UTC−05:00||Central Time|
|Other colors||UTC−05:00||UTC−04:00||Eastern Time|
|UTC−05:00 (year round)||Eastern Time|
UTC−06:00 is an identifier for a time offset from UTC of −06:00. In North America, it is observed in the Central Time Zone during standard time, and in the Mountain Time Zone during the other eight months (see Daylight saving time). Several Latin American countries and a few other places use it year round.
Principal cities: Mexico City, Chicago, Winnipeg
CST is standard time in the 6th time zone west of Greenwich, reckoned at the 90th meridian; used in North America in some parts of Canada, Mexico and the United States.
Principal cities: Denver, Calgary, Edmonton, Ciudad Juárez
Principal cities: Guatemala City, Tegucigalpa, Managua
The North American Central Time Zone (CT) is a time zone in parts of Canada, the United States, Mexico, Central America, some Caribbean Islands, and part of the Eastern Pacific Ocean.
The Eastern Time Zone (ET) is a time zone encompassing part or all of 22 states in the eastern part of the contiguous 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. Places that use Eastern Standard Time (EST) when observing standard time (autumn/winter) are five hours behind Coordinated Universal Time (UTC−05:00).
The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC) when standard time is in effect, and by subtracting six hours during daylight saving time (UTC−06:00). The clock time in this zone is based on the mean solar time at the 105th meridian west of the Greenwich Observatory. In the United States, the exact specification for the location of time zones and the dividing lines between zones is set forth in the Code of Federal Regulations at 49 CFR 71.
The Pacific Time Zone (PT) is a time zone encompassing parts of western Canada, the western United States, and western Mexico. Places in this zone observe standard time by subtracting eight hours from Coordinated Universal Time (UTC−08:00). During daylight saving time, a time offset of UTC−07:00 is used.
The Alaska Time Zone observes standard time by subtracting nine hours from Coordinated Universal Time (UTC−09:00). During daylight saving time its time offset is eight hours (UTC−08:00). The clock time in this zone is based on mean solar time at the 135th meridian west of the Greenwich Observatory.
Time in the United States, by law, is divided into nine standard time zones covering the states, territories and other US possessions, with most of the United States observing daylight saving time (DST) for approximately the spring, summer, and fall months. The time zone boundaries and DST observance are regulated by the Department of Transportation. Official and highly precise timekeeping services (clocks) are provided by two federal agencies: the National Institute of Standards and Technology (NIST) ; and the United States Naval Observatory (USNO). The clocks run by these services are kept synchronized with each other as well as with those of other international timekeeping organizations.
UTC−05:00 is an identifier for a time offset from UTC of −05:00. In North America, it is observed in the Eastern Time Zone during standard time, and in the Central Time Zone during the other eight months. The western Caribbean uses it year round.
The Atlantic Time Zone is a geographical region that keeps standard time—called Atlantic Standard Time (AST)—by subtracting four hours from Coordinated Universal Time (UTC), resulting in UTC−04:00. During part of the year, some portions of the zone observe daylight saving time, referred to as Atlantic Daylight Time (ADT), by moving their clocks forward one hour to result in UTC−03:00. The clock time in this zone is based on the mean solar time of the 60th meridian west of the Greenwich Observatory.
UTC−08:00 is an identifier for a time offset from UTC of −08:00. This time is used in:
UTC−04:00 is an identifier for a time offset from UTC of −04:00. It is observed in the Eastern Time Zone during the warm months of daylight saving time, as Eastern Daylight Time. The Atlantic Time Zone observes it during standard time . It is observed all year in the Eastern Caribbean.
UTC−07:00 is an identifier for a time offset from UTC of −07:00. In North America, it is observed in the Mountain Time Zone during standard time, and in the Pacific Time Zone during the other 8 months. Some locations use it year-round.
Canada is divided into six time zones, based on proposals by Scottish Canadian railway engineer Sir Sandford Fleming, who pioneered the use of the 24-hour clock, the world's time zone system, and a standard prime meridian. Most of Canada operates on standard time from the first Sunday in November to the second Sunday in March and daylight saving time the rest of the year.
The Indonesian archipelago geographically stretches across four time zones from UTC+06:00 in Aceh to UTC+09:00 in Western New Guinea. However, the Indonesian government recognizes only three time zones in its territory:
The Canadian province of Saskatchewan is geographically located in the Mountain Time Zone. However, most of the province observes Central Standard Time (CST) year-round. As a result, it is effectively on daylight saving time (DST) year-round, as clocks are not turned back an hour in autumn when most jurisdictions return to standard time.
Mexico uses four main time zones since February 2015. Most of the country observes Daylight Saving Time.
Europe spans seven primary time zones, excluding summer time offsets. Most European countries use summer time and harmonise their summer time adjustments; see Summer time in Europe for details.
Nunavut is divided into three time zones: Eastern, Central and Mountain.
Daylight saving time (DST) is observed in all ten Canadian provinces and three territories. However, there are exceptions: most of Saskatchewan observes Central Standard Time year-round and most of the territory of Nunavut, with its three time zones, observes daylight saving time. Under the Canadian Constitution, laws related to timekeeping are a provincial or territorial matter.
Order to entry in the new year is the chronological order of entry into the new year, according to Greenwich Mean Time.