UTC-4:00 is:

  1. the designation for Atlantic Standard Time which serves the Canadian Maritime provinces of New Brunswick, Nova Scotia, and Prince Edward Island during the late fall and winter months.
  2. the designation for Eastern Daylight Time which runs from early March until early November and serves much of the eastern United States and Canada including Connecticut, Delaware, Florida, Georgia Maine, Maryland, Massachusetts, Michigan (parts), New Hampshire, New Jersey, North Carolina, Ohio, Ontario, Pennsylvania, Quebec, Rhode Island, South Carolina, Vermont, Virginia Washington DC.
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