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Hawaii Aleutian daylight time (HADT)(UTC-9).

Hawaii – Aleutian standard time (HAST) (UTC-10).Standard time zones in the united states and other regions are currently defined at the federal level by law 15 USC 260. The US TIME ZONE MAP is divided into 9 categories: WHAT ARE THE DIFFERENT TIME ZONES IN THE UNITED STATES? The offset from the world’s standard time expressed as UTC- /UTC+ defines the local time within a time zone.Time zones are crucial for standardizing time across countries and regions.You can see the all-time zones in this printable timezone map of USA. All these zones are defined by an offset from the coordinated universal time by a number of hours centered on the prime meridian. In each geographic region within a time zone, people use the same time. Each section observes a uniform standard time to keep track of the day and night cycle and also for legal, social and commercial purposes. Printable Map of US Time ZonesĪ time zone is one of 24 spherical lunes with equal width-each assigned with one of the 24 hours. Noon occurred at different times but the time differences between distant locations were barely noticeable prior to the 19 th century because of long travel times and the lack of long-distance instant communication prior to the development of the telegraph. Before the adoption of four standard time zones for the continental United States, many towns and cities set their clock to noon when the sun passed their local meridian, pre-corrected for the equation of time on the date of observation, to form local mean solar time.