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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 .
As a work-around to the Uniform Time Act's prohibition on permanent DST, a bloc of states in New England has proposed a statutory move from the Eastern Time Zone to the Atlantic Time Zone (Atlantic Time being one hour ahead of Eastern Time), and then abolishing biannual clock changes.
The state "could make a data-driven case for moving to the Atlantic Time Zone year-round," the commission said in a draft report released in September.
Map of U.S. time zones with new CST and EST areas displayed. Some U.S. time zones, such as the Samoa Time Zone, are not on this map. This is a list of the time offsets by U.S. states, federal district, and territories. For more about the time zones of the U.S. see time in the United States. Most states are entirely contained within one time zone.
Time zones were therefore a compromise, relaxing the complex geographic dependence while still allowing local time to be approximate with mean solar time. Railroad managers tried to address the problem by establishing 100 railroad time zones, but this was only a partial solution to the problem. [2]
In 2016, a committee in the state was formed to consider having Massachusetts adopt Atlantic Standard Time year round to prevent sunsets from occurring before 16:30 and eliminate the need to change clocks at the beginning and end of daylight saving time. [3]
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]
Turks and Caicos discontinued Daylight Saving Time in March 2015, at the same time moving from the Eastern Time Zone to the Atlantic Time Zone, the result being the same as having year-round Daylight Saving in the Eastern Time Zone. In 2018, the islands reintroduced daylight saving time by setting the clocks back 1 hour to Eastern Standard Time ...