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The Pacific Time Zone (PT) is a time zone encompassing parts of western Canada, the western United States, and western Mexico. Places in this zone observe standard time by subtracting eight hours from Coordinated Universal Time (UTC−08:00).
Standard Time (SDT) and Daylight Saving Time (DST) offsets from UTC in hours and minutes. For zones in which Daylight Saving is not observed, the DST offset shown in this table is a simple duplication of the SDT offset. The UTC offsets are based on the current or upcoming database rules.
This map was made by combining version 2023d of the List of tz database time zones with OpenStreetMap data, using open source software. [1] The tz database is a collaborative compilation of information about the world's time zones and rules for observing daylight saving time, primarily intended for use with computer programs and operating ...
The Ohio Clock in the U.S. Capitol being turned forward for the country's first daylight saving time on March 31, 1918 by the Senate sergeant at arms Charles Higgins.. Most of the United States observes daylight saving time (DST), the practice of setting the clock forward by one hour when there is longer daylight during the day, so that evenings have more daylight and mornings have less.
If present, a dagger (†) indicates the usage of a nautical time zone letter outside of the standard geographic definition of that time zone. Some zones that are north/south of each other in the mid-Pacific differ by 24 hours in time – they have the same time of day but dates that are one day apart. The two extreme time zones on Earth (both ...
The wacky time zones also resulted in train collisions as railroad companies struggled to coordinate. In 1883, railroad companies began operating on a four-time zone system.
The Oregon legislation states that the part of Oregon in the Pacific Time Zone would stop "the one-hour change of time in the spring and fall of each year" keeping the zone standard time year-round.
The Alaska Time Zone observes standard time by subtracting nine hours from Coordinated Universal Time (UTC−09:00). During daylight saving time its time offset is eight hours ( UTC−08:00 ). The clock time in this zone is based on mean solar time at the 135th meridian west of the Greenwich Observatory .