1948  . . . Nova Scotia [stretches] so far toward Europe that "Atlantic Time," an hour in advance of the rest of the Continent, is the standard.
1952  The North Shore of the Gulf of St. Lawrence and the Gaspe Peninsula fall in the Atlantic Standard Time Zone, four hours later than Greenwich Mean Time.
1963  . . . the 68th parallel of longitude [is] the dividing line between Eastern and Atlantic time. . . .