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The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2025a of the tz database. [2]
Converted small area of fishing camps west of Suomi ON from CST/CDT to EST/EDT; this improves alignment with boundaries shown on the official Ontario road map. Also applied a few cosmetic changes. 23:33, 25 October 2020: 1,114 × 942 (381 KB) MapGrid: Time zone boundary adjustment in the vicinity of Schefferville.
Date: 4 March 2024: Source: Outline based on the map by the U.S. Central Intelligence Agency (CIA). Time zone information based on the Time Zone Database by the Internet Assigned Numbers Authority (IANA). Author: Heitordp
All of Newfoundland and southern Labrador, which observes UTC−03:30 as its standard time zone, observed UTC−01:30. [25] This only happened in 1988 and the province now only adjusts its time by one hour for daylight saving time.
The purpose of the "principal cities" list at the top of some of the time zone entries is to give a brief list of major cities. These should be limited to a maximum of one city per country (within each zone), and not all countries in a zone need to have a city listed.
World time zone map Archived December 24, 2015, at the Wayback Machine; U.S. time zone map Archived February 15, 2009, at the Wayback Machine; History of U.S. time zones and UTC conversion Archived August 8, 2011, at the Wayback Machine; Canada time zone map; Official times across Mexico; Canada time map; U.S. time map
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 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 .
Time in Tennessee, as in all U.S. states, is regulated by the United States Department of Transportation. About 73 percent of the counties in the state of Tennessee lie in the Central Time Zone, mostly the western and middle grand divisions, while East Tennessee is mostly in the Eastern Time Zone except for three counties in that division. [1] [2]