The UTC Time (shown directly below) is the standard time zone upon which all other worldwide time zones are based. Mozilla Firefox, still display it as GMT. Some sources still refer to it as UTC/GMT and some web browsers, e.g. The worldwide standard for coordinated universal time, formerly known as GMT (Greenwich Mean Time), is now abbreviated as UTC (Coordinated Universal Time). Important (current time) Exceptions: Parts of Florida, Idaho, Indiana, Kansas, Kentucky, Michigan, Nebraska, North Dakota, Oregon, South Dakota, Tennessee and Texas are in two time zones. In the winter Arizona is on Mountain Standard Time (MST).Īlaska (AK) 90% of Alaska is (1 hour) behind the Pacific Time Zone, while the far reaches of the Aleutian Islands use Hawaii-Aleutian time. In summer, local time in Arizona is the same as Pacific Daylight Time (PDT). Quirico Filopanti, an Italian mathematician, proposed the first worldwide time zones in1858. Across the United States of America, Daylight Savings Time is now in effect.ĭaylight Saving Time is not observed in Hawaii, and by most of Arizona. The meridian of Rome and the first time zone world map.
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