Time reverts to standard time at 2 a.m. on the first Sunday of November. Still the time table for port calls must follow the land time zone. View Current Times in All United States Cities and Towns, Time Zone Look Up by State with Current Local Times, WE RESPECT YOUR PRIVACY. strict: they follow the boundaries of countries, because it would be inconvenient otherways. Example city: Mountain Standard Time, 7 hours behind GMT. Most time zones that are on land are offset from UTC. Current time in the four US time zones (covering the 48 contiguous states), Daylight Saving Time (DST) automatically calculated. DST changes. Daylight Saving Time begins for most of the United States at 2 a.m. on the second Sunday of March. For example, if a New Yorker plans to meet someone in Los Angeles at 9 AM, and makes a calendar entry at 9 AM (which the computer assumes is New York time), the calendar entry will be at 6 AM if taking the computer's time zone. Most countries around the equator do not observe daylight saving time, since the seasonal difference in sunlight is minimal. The time zone boundaries and DST observance are regulated by the Department of Transportation. World time and date for cities in all time zones. [citation needed] The Afghanistan-China border marks the greatest terrestrial time zone difference on Earth, with a 3.5 hour difference between Afghanistan's UTC+4:30 and China's UTC+08:00. Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory located in Greenwich, London, considered to be located at a longitude of zero degrees. The event can be shown at the wrong time. This includes the ability to get and set the default script time zone, and DateTime is aware of its own time zone internally. From east to west they are Atlantic Standard Time (AST), Eastern Standard Time (EST), Central Standard Time (CST), Mountain Standard Time (MST), Pacific Standard Time (PST), Alaskan Standard Time (AKST), Hawaii-Aleutian Standard Time (HST), Samoa standard time (UTC-11) and Chamorro Standard Time (UTC+10). The National Institute of Standards and Technology - Time and Frequency Division maintains the standard for frequency and time interval for the United States, provides official time to the United States, and carries out a broad program of research and service activities in time and frequency metrology. (The more familiar term "UTC offset" is used here rather than the term "zone designator" used by the standard. For example, if the time being described is one hour ahead of UTC (such as the time in Berlin during the winter), the zone designator would be "+01:00", "+0100", or simply "+01". The format is typically based in the W3C Note "datetime". published in 1858. Modern DST was first proposed in 1907 and was in widespread use in 1916 as a wartime measure aimed at conserving coal. Nepal was the last country to adopt a standard offset, shifting slightly to UTC+5:45 in 1956.[14]. Newfoundland Standard Time is UTC−03:30, Nepal Standard Time is UTC+05:45, Indian Standard Time is UTC+05:30 and Myanmar Standard Time is UTC+06:30). A time zone is a geographical area that has the same state-regulated time, known as "standard time". Many computer operating systems include the necessary support for working with all (or almost all) possible local times based on the various time zones. [34] This allows users in multiple time zones to use the same computer, with their respective local times displayed correctly to each user. California and Washington are fully within PT. For example, the international English-language version of CNN includes GMT and Hong Kong Time,[28] whereas the US version shows Eastern Time. The United States uses nine standard time zones. The confusion of times came to an end when Standard zone time was formally adopted by the U.S. Congress in the Standard Time Act of March 19, 1918. Due to the size of some countries and the spread of other places belonging under their jurisdiction, one country can be divided into a number of time zones. Most Unix-like systems, including Linux and Mac OS X, keep system time in time_t format, representing the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC) on Thursday, January 1, 1970. Database records that include a time stamp typically use UTC, especially when the database is part of a system that spans multiple time zones. [37] This library includes its own time zone data based on the IANA time zone database. [39] However, due to size constraint, some implementations or distributions do not include it. When well-regulated mechanical clocks became widespread in the early 19th century,[1] each city began to use local mean solar time. Calendar systems nowadays usually tie their time stamps to UTC, and show them differently on computers that are in different time zones. UTC, which is based on highly precise atomic clocks and the Earth's rotation, is the new standard of today. The captain is permitted to change the ship's clocks at a time of the captain's choice following the ship's entry into another time zone. Arizona, Puerto Rico, Hawaii, U.S. Virgin Islands and American Samoa do not observe Daylight Saving Time. Timekeeping on Mars can be more complex, since the planet has a solar day of approximately 24 hours and 39 minutes, known as a sol. From east to west they are Atlantic Standard Time (AST), Eastern Standard Time (EST), Central Standard Time (CST), Mountain Standard Time (MST), Pacific Standard Time (PST), Alaskan Standard Time (AKST), Hawaii-Aleutian Standard Time (HST), Samoa standard time (UTC-11) and Chamorro Standard Time (UTC+10). This article is about time zones in general. Many countries or regions, especially those in Europe and North America practice daylight saving time (DST), sometimes referred to as "summer time," with the intent of saving energy. The first adoption of a standard time was in November 1840, in Great Britain by railway companies using GMT kept by portable chronometers. (See the article on daylight saving time for more details on this aspect). Near the summer solstice, Muxía has sunset times (after 22:00) similar to those of Stockholm, which is in the same time zone and 16 degrees farther north. The United States uses nine standard time zones. It works less well when travelling, because the calendar events are assumed to take place in the time zone the computer or smartphone was on when creating the event. Newfoundland, India, Iran, Afghanistan, Myanmar, Sri Lanka, the Marquesas, as well as parts of Australia use half-hour deviations from standard time, and some nations, such as Nepal, and some provinces, such as the Chatham Islands of New Zealand, use quarter-hour deviations. It wasn't until 1929 before most countries adopted hourly time zones Nepal, the final holdout, did not adopt a standard offset of UTC until 1956, and even then, has a less common offset of UTC+5:45. In the U.S., there are a total of 9 time zones used. VisualWorks provides a TimeZone class that supports up to two annually recurring offset transitions, which are assumed to apply to all years (same behavior as Windows time zones).

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