In 2000, Wayne County, on the Tennessee border, switched from Central to Eastern Time. The easternmost and northernmost counties in Kentucky were added to the zone in the 1940s, and in 1961 most of the state went Eastern. The boundaries of the Eastern Time Zone have moved westward since the Interstate Commerce Commission (ICC) took over time-zone management from railroads in 1938. Southern parts of the zone in Panama and the Caribbean, however, do not observe daylight saving time. EST, which results in one hour being duplicated. On the first Sunday in November, at 2:00 a.m. On the second Sunday in March, at 2:00 a.m. Eastern Daylight Time ( EDT), when observing daylight saving time (spring/summer), are four hours behind Coordinated Universal Time ( UTC−04:00).

Eastern Standard Time ( EST), when observing standard time (autumn/winter), are five hours behind Coordinated Universal Time ( UTC−05:00).The Eastern Time Zone ( ET) is a time zone encompassing part or all of 23 states in the eastern part of the United States, parts of eastern Canada, and the state of Quintana Roo in Mexico. DST is observed in parts of this time zone.

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