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Mexico uses four main time zones since February 2015: #''Zona Sureste'' (Southeast Zone) covers the state of Quintana Roo (the equivalent of Canadian and U.S. Eastern Time). #''Zona Centro'' (Central Zone) covers the eastern three-fourths of Mexico, including Mexico City, Guadalajara and Monterrey (the equivalent of Canadian and U.S. Central Time). #''Zona Pacífico'' (Pacific Zone) covers the states of Baja California Sur, Chihuahua, Nayarit, Sinaloa, and Sonora (the equivalent of Canadian and U.S. Mountain Time). #''Zona Noroeste'' (Northwest Zone) covers the state of Baja California, including Tijuana (the equivalent of Canadian and U.S. Pacific Time). In addition, the law dictates that all island territories should fall within the time zone corresponding to their geographic location. ==History== Standard time was first defined in Mexico in 1921, when President Álvaro Obregón decreed two time zones. One time zone designated for 90° W covered the states of Tabasco, Chiapas, Campeche, Yucatan, and Quintana Roo. A second time zone designated for 105° W covered the rest of the country, from Baja California to Veracruz and Oaxaca. In 1930 three zones were decreed: ''Hora del Oeste'' (120° W) for the state of Baja California (norte); ''Hora del Golfo'' (90° W) covering the states of Tamaulipas, Veracruz, Oaxaca, Tabasco, Chiapas, Campeche, Yucatan and Quintana Roo; and ''Hora del Centro'' (105° W) for the rest of the country. It was decreed in 1942 that the ''Hora del Noroeste'' (105° W) should cover only the states of Baja California Sur, Sonora, Sinaloa, and Nayarit; while the ''Hora del Centro'' (90° W) was used for the rest of the country. The time zone ''Hora del Sureste'' (75° W) was created for tourist reasons in 1981, originally covering the states of Campeche, Yucatan, and Quintana Roo. The states of Campeche and Yucatan returned one year latter to the ''Hora del Centro'' (90° W);〔 while Quintana Roo returned to the ''Hora del Sureste'' (75° W) in 2015.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Time in Mexico」の詳細全文を読む スポンサード リンク
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