The GMT-5 time zone covers a large portion of the eastern half of North America, including the US East Coast, eastern Canada, and parts of the Caribbean.
During standard time, the GMT-5 time zone is 5 hours behind Coordinated Universal Time (UTC).
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However, during daylight saving time, it is only 4 hours behind UTC.
The GMT-5 time zone does not observe daylight saving time year-round like some other time zones.
It only observes daylight saving time for part of the year.
The time in the GMT-5 time zone is the same as the time in the Eastern Time Zone in the United States and Canada, except during the period when one is on daylight saving and the other is not.
Major cities in the GMT-5 time zone include New York City, Miami, Atlanta, Toronto, and Montreal.
The GMT-5 time zone was originally based on the mean solar time of the 75th meridian west of Greenwich, England.
During the American Civil War, the Union forces used GMT-5 time to coordinate military operations across the eastern United States.
The GMT-5 time zone is currently used by 9 countries or territories, including the United States, Canada, Panama, and parts of the Bahamas.
In the GMT-5 time zone, the sunrise and sunset times can vary by over 3 hours depending on the location and time of year.
The transition to and from daylight saving time in the GMT-5 zone can cause confusion for some travelers, as clocks shift forward or backward by an hour.
The GMT-5 time zone is not observed year-round in all locations - some areas, like most of Indiana, observe Eastern Standard Time (GMT-5) year-round.
The GMT-5 time zone is considered to be in the "America/New_York" time zone by computer systems and international standards.