Time Zone History

Time zone history in North and Central America

80 zones of the tz database have their reference point in North and Central America. They use 11 different standard times today; the most common is UTC−6, kept by 26 zones. 48 still change their clocks during the year. 27 used daylight saving time at some point since 1970 and no longer do, most recently in 2026. The record with the most changes of standard time since 1970 is Managua, with 6 times.

Standard times in use

UTC+01 zoneUTC−22 zonesUTC−31 zoneUTC−3:301 zoneUTC−49 zonesUTC−519 zonesUTC−626 zonesUTC−712 zonesUTC−82 zonesUTC−96 zonesUTC−101 zoneUTC+01 zoneUTC−22 zonesUTC−31 zoneUTC−3:301 zoneUTC−49 zonesUTC−519 zonesUTC−626 zonesUTC−712 zonesUTC−82 zonesUTC−96 zonesUTC−101 zone

Every zone, with its clock changes since 1970

The strip shows 1970 to 2028; amber marks years with seasonal clock changes.

ZoneStandard timeClock changes todayNew standard times since 19701970 to 2028
Danmarkshavn, GreenlandUTC+0no (last 1995)1
Ittoqqortoormiit, GreenlandUTC−2yes2
Nuuk, GreenlandUTC−2yes1
Saint Pierre and MiquelonUTC−3yes1
St. John’s, CanadaUTC−3:30yes0
BarbadosUTC−4no (last 1980)0
Glace Bay, CanadaUTC−4yes0
Goose Bay, CanadaUTC−4yes0
Halifax, CanadaUTC−4yes0
MartiniqueUTC−4no (last 1980)0
Moncton, CanadaUTC−4yes0
Pituffik (Thule), GreenlandUTC−4yes0
Puerto RicoUTC−4no0
Dominican RepublicUTC−4no (last 1974)3
Cancún, MexicoUTC−5no (last 2014)5
Detroit, United StatesUTC−5yes0
Turks and Caicos IslandsUTC−5yes2
CubaUTC−5yes0
Indianapolis, Indiana, United StatesUTC−5yes0
Iqaluit, CanadaUTC−5yes2
JamaicaUTC−5no (last 1983)0
Louisville, Kentucky, United StatesUTC−5yes2
Marengo, Indiana, United StatesUTC−5yes2
Monticello, Kentucky, United StatesUTC−5yes1
New York, United StatesUTC−5yes0
PanamaUTC−5no0
Petersburg, Indiana, United StatesUTC−5yes3
HaitiUTC−5yes0
Toronto, CanadaUTC−5yes0
Vevay, Indiana, United StatesUTC−5yes0
Vincennes, Indiana, United StatesUTC−5yes2
Winamac, Indiana, United StatesUTC−5yes2
Winnipeg, CanadaUTC−5no (last 2026)1
Bahía de Banderas, MexicoUTC−6no (last 2022)1
BelizeUTC−6no (last 1983)0
Beulah, North Dakota, United StatesUTC−6yes1
Center, North Dakota, United StatesUTC−6yes1
Chicago, United StatesUTC−6yes0
Chihuahua, MexicoUTC−6no (last 2022)2
Costa RicaUTC−6no (last 1992)0
Edmonton, CanadaUTC−6no (last 2026)1
El SalvadorUTC−6no (last 1988)0
GuatemalaUTC−6no (last 2006)0
Inuvik, CanadaUTC−6no (last 2026)2
Knox, Indiana, United StatesUTC−6yes2
NicaraguaUTC−6no (last 2006)6
Matamoros, MexicoUTC−6yes0
Menominee, United StatesUTC−6yes1
Mexico City, MexicoUTC−6no (last 2022)0
Monterrey, MexicoUTC−6no (last 2022)0
Mérida, MexicoUTC−6no (last 2022)2
New Salem, North Dakota, United StatesUTC−6yes1
Ojinaga, MexicoUTC−6yes2
Rankin Inlet, CanadaUTC−6yes2
Regina, CanadaUTC−6no0
Resolute, CanadaUTC−6yes4
Swift Current, CanadaUTC−6no1
HondurasUTC−6no (last 2006)0
Tell City, Indiana, United StatesUTC−6yes1
Boise, United StatesUTC−7yes0
Cambridge Bay, CanadaUTC−7yes4
Ciudad Juárez, MexicoUTC−7yes3
Dawson, CanadaUTC−7no (last 2020)2
Dawson Creek, CanadaUTC−7no (last 1972)1
Denver, United StatesUTC−7yes0
Fort Nelson, CanadaUTC−7no (last 2014)1
Hermosillo, MexicoUTC−7no (last 1998)0
Mazatlan, MexicoUTC−7no (last 2022)0
Phoenix, United StatesUTC−7no0
Vancouver, CanadaUTC−7no (last 2026)1
Whitehorse, CanadaUTC−7no (last 2020)1
Los Angeles, United StatesUTC−8yes0
Tijuana, MexicoUTC−8yes0
Anchorage, United StatesUTC−9yes1
Juneau, United StatesUTC−9yes3
Metlakatla, United StatesUTC−9yes3
Nome, United StatesUTC−9yes1
Sitka, United StatesUTC−9yes1
Yakutat, United StatesUTC−9yes0
Adak, United StatesUTC−10yes1