UTC−10:00 is an identifier for a time offset from UTC of −10:00. This time is used in Hawaii, Alaska, French Polynesia, and the Cook Islands. Principal
UTC+10:30 is an identifier for a time offset from UTC of +10:30. This time is used in parts of Australia. Australia New South Wales Lord Howe Island Principal
introduction of Unix Time on January 1, 1970. In those days before 1970, the GMT (Greenwich Mean Time) was the term being used. "eCFR :: 49 CFR 71.12 - -