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The evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments. Plaque in Chicago marking the creation of the four time zones of the continental US in 1883 Colorized 1913 time zone map of the United States, showing boundaries very different from today Map of U.S. time zones during between April 2, 2006, and March 11, 2007.
Standard time in the contiguous United States, illustration 1903. From east to west, the four time zones of the contiguous United States are: Eastern Time Zone (Zone R), which comprises roughly the states on the Atlantic coast and the eastern two thirds of the Ohio Valley.
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.
Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.
Ancient history – Aggregate of past events from the beginning of recorded human history and extending as far as the Early Middle Ages or the Postclassical Era. The span of recorded history is roughly five thousand years, beginning with the earliest linguistic records in the third millennium BC in Mesopotamia and Egypt .
For example, Thanksgiving is defined as being on "the fourth Thursday in November". Some such definitions are more complex. For example, Election Day is defined as "the Tuesday next after the first Monday in the month of November" or "the first Tuesday after November 1". [14] Calendars mostly show Sunday as the first day of the week.
List of time zones by country – sorted by number of current time zones in the world; List of UTC offsets – current UTC offsets; List of time zone abbreviations – abbreviations; List of tz database time zones – zones used by many computer systems as defined by IANA; List of military time zones; Country-specific: List of time zones by U.S ...
Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...