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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).
World time zone map Archived 24 December 2015 at the Wayback Machine; U.S. time zone map; History of U.S. time zones and UTC conversion Archived 8 August 2011 at the Wayback Machine; Canada time zone map; Time zones for major world cities; Official times across Canada; Official times across Mexico; Canada time map; U.S. time map
Time Zone abbreviations. Time zone abbreviations for both Standard Time and Daylight Saving Time are shown exactly as they appear in the database. See strftime and its "%Z" field. Some of zone records use 3 or 4 letter abbreviations that are tied to physical time zones, others use numeric UTC offsets. List
A time zone is a geographical region in which residents observe the same standard time.Although nominally a new time zone is established every 15 degrees east or west of the prime meridian (meaning a one hour change in solar time), in practice local geographical or political considerations may vary its application.
The history of standard time in the United States began November 18, 1883, when United States and Canadian railroads instituted standard time in time zones.Before then, time of day was a local matter, and most cities and towns used some form of local solar time, maintained by some well-known clock (for example, on a church steeple or in a jeweler's window).
City and West End became zone 1 and the rest of Greater London was within zones 2, 3, 4 and 5. Further products were launched using the zones: One Day Travelcard (1984), Capitalcard (1985), One Day Capitalcard (1986). In January 1991 Zone 5 was split to create a new Zone 6. Principal fare zones
In other words, the earthquake zoning map of India divides India into 4 seismic zones (Zone 2, 3, 4 and 5) unlike its previous version, which consisted of five or six zones for the country. According to the present zoning map, Zone 5 expects the highest level of seismicity whereas Zone 2 is associated with the lowest level of seismicity.
UTC−04:00 is an identifier for a time offset from UTC of −04:00.  It is observed in the Eastern Time Zone (e.g., Canada and the United States) during the warm months of daylight saving time, as Eastern Daylight Time. The Atlantic Time Zone observes it during standard time (cold months).