Central Time Zone

The North American Central Time Zone (CT) is a time zone in parts of Canada, the United States, Mexico, Central America and some Caribbean islands.

In parts of that zone (20 states in the US, three provinces or territories in Canada, and several border municipalities in Mexico), the Central Time Zone is affected by two time designations yearly: Central Standard Time (CST) is observed from the first Sunday in November to the second Sunday in March. It is six hours behind Coordinated Universal Time (UTC) and designated internationally as UTC−6. From the second Sunday in March to the first Sunday in November the same areas observe daylight saving time (DST), creating the designation of Central Daylight Time (CDT) which is five hours behind UTC and known internationally as UTC−5.

Canada
The province of Manitoba is the only province or territory in Canada that observes Central Time in all areas.

The following Canadian provinces and territories observe Central Time in the areas noted, while their other areas observe Eastern Time:
 * Nunavut (territory): western areas (most of Kivalliq Region and part of Qikiqtaaluk Region)
 * Ontario (province): a portion of the northwest bordering southeastern Manitoba, in and around Kenora.

Also, most of the province of Saskatchewan is on Central Standard Time year-round, never adjusting for Daylight Saving Time. One major exception includes Lloydminster, a city whose borders overlap both Alberta and Saskatchewan. The city charter stipulates that it shall observe Mountain Time and DST, putting the community on the same time as all of Alberta (UTC−7) in the winter, and in time with Saskatchewan (UTC−6) during the summer.

United States
Ten states are contained entirely in the Central Time Zone:
 * Alabama
 * Arkansas
 * Illinois
 * Iowa
 * Louisiana
 * Minnesota
 * Mississippi
 * Missouri
 * Oklahoma
 * Wisconsin

Five states are split between the Central Time Zone and the Mountain Time Zone:
 * Kansas: all except for Sherman, Wallace, Greeley, and Hamilton counties
 * Nebraska: eastern two thirds including the eastern one third of Cherry County
 * North Dakota: all except for southwest regions, south part of McKenzie County, and the majority of Dunn County and far western Sioux County
 * South Dakota: eastern half including part of Stanley County
 * Texas: all except for El Paso, Hudspeth, and northwestern Culberson counties

Five states are split between the Central Time Zone and the Eastern Time Zone: Additionally, Phenix City, Alabama, and several nearby communities in Russell County, Alabama, unofficially observe Eastern Time. This is due to their close proximity to Columbus, Georgia, which is on Eastern Time.
 * Florida: most of Florida Panhandle west of the Apalachicola River; Franklin County west of the Apalachicola River and parts of Gulf County are in the Central Time Zone
 * Indiana: northwest (Gary) and southwest (Evansville) regions
 * Kentucky: the western portion of the state, including its three major towns: Bowling Green, Owensboro and Paducah
 * Michigan: Gogebic, Iron, Dickinson, and Menominee counties
 * Tennessee: West Tennessee and Middle Tennessee, including the major cities of Nashville and Memphis

Although legally located within the Central Time Zone, Kenton, Oklahoma—located to the adjacent east of the defined border of the Central and Mountain time zones (at the Oklahoma−New Mexico state line)—unofficially observes Mountain Time. This is reportedly because most people who interact with the town reside in either New Mexico or Colorado.

Mexico
Most of Mexico—roughly the eastern three-fourths—lies in the Central Time Zone, except for five northwestern states (Baja California, Baja California Sur, Sinaloa, Sonora, and most of Nayarit) and one southeastern state (Quintana Roo). It is known locally as the Zona Centro.

The federal entities of Mexico that observe Central Time:


 * Aguascalientes
 * Campeche
 * Chihuahua – Excluding the municipalities of Janos, Ascensión, Juárez, Guadalupe, and Práxedis Gilberto Guerrero, which observe Mountain Time with DST. Additionally, counties east of Guadalupe observe Daylight Savings in Central Time.
 * Coahuila
 * Colima – except for the Revillagigedo Islands, in which the inner islands use UTC−7 and the outer island uses UTC−8
 * Chiapas
 * Durango
 * Guanajuato
 * Guerrero
 * Hidalgo
 * Jalisco
 * Mexico City
 * Michoacán
 * Morelos
 * Nayarit – *only the municipality of Bahía de Banderas, rest of the state uses UTC−7
 * Nuevo León
 * Oaxaca
 * Puebla
 * Querétaro
 * San Luis Potosí
 * State of Mexico
 * Tabasco
 * Tamaulipas
 * Tlaxcala
 * Veracruz
 * Yucatán
 * Zacatecas

Central America
Out of the seven countries comprising Central America, all but one use Central Standard Time year-round:
 * Belize, Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua.

Panama, which recognizes Eastern Standard Time (UTC−5) year round, is the exception.

Central Daylight Time
Daylight saving time (DST) is in effect in much of the Central time zone between mid-March and early November. The modified time is called "Central Daylight Time" (CDT) and is UTC−05:00.

In the United States, all time zones that observe DST were effectively changed by the Energy Policy Act of 2005. Beginning in 2007, DST would now begin at 2 a.m. on the second Sunday in March instead of the first Sunday in April, moving the time from 2 to 3 a.m. Additionally, DST would end at 2 a.m. on the first Sunday in November instead of the last Sunday in October, moving the time from 2 to 1 a.m.

At the time, Mexico decided not to go along with this change and observed their horario de verano from the first Sunday in April to the last Sunday in October. In December 2009, the Mexican Congress allowed ten border cities, eight of which are in states that observe Central Time, to adopt the US daylight time schedule effective in 2010. However, in October 2022, CDT was used in Mexico for the last time after DST was abolished. The US is also seeing traction in the same direction with the Sunshine Protection Act that proposes legislation that would permanently end the switching of times and make daylight saving time permanent.

Alphabetical list of major Central Time Zone metropolitan areas

 * Acapulco, Guerrero
 * Aguascalientes, Aguascalientes
 * Amarillo, Texas
 * Antigua Guatemala
 * Austin, Texas
 * Baton Rouge, Louisiana
 * Beaumont/Port Arthur, Texas
 * Belize City, Belize
 * Belmopan, Belize
 * Birmingham, Alabama
 * Bismarck, North Dakota
 * Bloomington, Illinois
 * Bowling Green, Kentucky
 * Brandon, Manitoba
 * Cedar Rapids, Iowa
 * Champaign, Illinois
 * Chicago, Illinois
 * Clarksville, Tennessee
 * Comarca Lagunera (Torreón, Gómez Palacio, Lerdo)
 * Columbia, Missouri
 * Cuernavaca, Morelos
 * Dallas–Fort Worth, Texas
 * Des Moines, Iowa
 * Enid, Oklahoma
 * Evansville, Indiana
 * Fargo, North Dakota
 * Fort Smith, Arkansas
 * Fort Walton Beach, Florida
 * Grand Forks, North Dakota
 * Grand Rapids, Manitoba
 * Green Bay, Wisconsin
 * Guadalajara, Jalisco
 * Guatemala City, Guatemala
 * Houston, Texas
 * Huntsville, Alabama
 * Iowa City, Iowa
 * Jackson, Mississippi
 * Jackson, Tennessee
 * Janesville, Wisconsin
 * Jonesboro, Arkansas
 * Joplin, Missouri
 * Kansas City, Missouri/Kansas
 * Killeen–Temple–Fort Hood, Texas
 * Lafayette, Louisiana
 * Lawrence, Kansas
 * León, Guanajuato
 * Lincoln, Nebraska
 * Little Rock, Arkansas
 * Lubbock, Texas
 * Madison, Wisconsin
 * Managua, Nicaragua
 * Memphis, Tennessee
 * Mérida, Yucatán
 * Mexico City
 * Midland/Odessa, Texas
 * Milwaukee, Wisconsin
 * Minneapolis–Saint Paul, Minnesota
 * Mobile, Alabama
 * Monroe, Louisiana
 * Monterrey, Nuevo León
 * Montgomery, Alabama
 * Morelia, Michoacán
 * Nashville, Tennessee
 * New Orleans, Louisiana
 * Normal, Illinois
 * Northwest Arkansas
 * Oklahoma City, Oklahoma
 * Omaha, Nebraska
 * Owensboro, Kentucky
 * Paducah, Kentucky
 * Panama City, Florida
 * Pensacola, Florida
 * Peoria, Illinois
 * Puebla, Puebla
 * Quad Cities, Iowa/Illinois
 * Racine, Wisconsin
 * Red Lake, Ontario
 * Regina, Saskatchewan
 * Rockford, Illinois
 * Rochester, Minnesota
 * Sioux City, Iowa
 * Sioux Falls, South Dakota
 * St. Louis, Missouri
 * San Antonio, Texas
 * San José, Costa Rica
 * San Luis Potosí, San Luis Potosí
 * San Pedro Sula, Honduras
 * San Salvador, El Salvador
 * Santiago de Querétaro, Querétaro
 * Saskatoon, Saskatchewan
 * Shreveport–Bossier City, Louisiana
 * Springfield, Illinois
 * Springfield, Missouri
 * Tampico, Tamaulipas
 * Tegucigalpa, Honduras
 * Thompson, Manitoba
 * Toluca, Estado de México
 * Topeka, Kansas
 * Tuscaloosa, Alabama
 * Tulsa, Oklahoma
 * Wichita, Kansas
 * Wichita Falls, Texas
 * Winnipeg, Manitoba
 * Zacatecas, Zacatecas