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UTC-4: Blue (December), Orange (June), Yellow (all year round), Light Blue - Sea areas
UTC−4 is the time offset used in the Atlantic Standard Time Zone in Canada in winter and the North American Eastern Time Zone during daylight saving time (DST), in the Caribbean region this is considered as the Eastern Caribbean (ECT) timezone. There are possibly other various names in other countries.
As standard time (all year round)
ECT - Eastern Caribbean Time Zone
Atlantic Standard Time
Other Caribbean
South America
North America
As standard time (Northern Hemisphere winter)
Atlantic Standard Time
As standard time (Southern Hemisphere winter)
South America
As daylight saving time (Northern Hemisphere summer)
Caribbean
Eastern Daylight Time
 Canada
 United States
- all of
 Connecticut, Delaware,  District of Columbia,  Georgia (U.S. state),  Maine,  Maryland, Massachusetts,  New Hampshire,  New Jersey, New York,  North Carolina,  Ohio,  Pennsylvania,  Rhode Island,  South Carolina,  Vermont,  Virginia,  West Virginia
- most of
 Florida,  Indiana,  Michigan
- Eastern parts of
 Kentucky,  Tennessee
References
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Anguilla (UK)
Antigua and Barbuda
Barbados
Dominica
Grenada
Montserrat (UK)
Saint Kitts and Nevis
Saint Lucia
Saint Vincent and the Grenadines
Trinidad and Tobago
British Virgin Islands (UK)
Puerto Rico (US)
U.S. Virgin Islands (US)
Aruba (Netherlands)
Dominican Republic
Guadeloupe (France)
Netherlands Antilles (Netherlands)
Bermuda (UK)
New Brunswick (legally offset from GMT[1]), 
Nova Scotia (legally offset from GMT[2]), 
Prince Edward Island
Newfoundland and Labrador - most of Labrador
Greenland (Denmark) (Kalaallit Nunaat)- northwestern (observes United States daylight saving time rules)
Argentina - San Luis
Brazil - Mato Grosso, Mato Grosso do Sul
Chile - Mainland
Falkland Islands
Paraguay
