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Time has long been a major subject of philosophy, art, poetry, and science. There are widely divergent views about its meaning; hence it is difficult to provide an uncontroversial definition of time. Scholars disagree on whether time itself can be measured or is itself part of the measuring system. Many fields use an operational definition in which the only definition attempted is that of the units used.

The measurement of time has also occupied scientists and technologists, and was a prime motivation in astronomy. Time is also a matter of significant social importance, having economic value ("time is money") as well as personal value, due to an awareness of the limited time in each day and in our lives. Units of time have been agreed upon to quantify the duration of events and the intervals between them. Regularly recurring events and objects with apparent periodic motion have long served as standards for units of time. Examples are the apparent motion of the sun across the sky, the phases of the moon, and the swing of a pendulum.

Time has historically been closely related with space, most obviously with spacetime in Einstein's General Relativity.

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American Time Zones - Displays a map of the main parts of the United States, showing the time zones and the current local time. Time details for most US cities available.
Meta Description: [ Displays a detailed map of the time zones in the United States, and gives you the local time for most US cities. ]

Calculate the Day of the Week - Provides formulas and methods to calculate the day of the week for a given date, without the need of a computer or calculator. Features calculators in Flash and JavaScript for your convenience.
Meta Description: [ cellular phones digital cameras photo printing weight loss health care ]

ClockGenius - Shows the time in your preference areas of the world.

CNN - World Time - Time Zone Map with Shockwave graphics. Roll over time zones and get GMT offset, or roll over major cities, and get the current time. Swatch beat display and converter as well.

404 Econofinance World Time Zones Converter - Find the time from a list of 250 capitals and major cities in the world.

GMT - Provides comprehensive information on Greenwich and Time issues, including maps, GMT Converter and resources.
Meta Description: [ Greenwich Mean Time (GMT). Complete guide to time and time zones; summer time and daylight-saving time world-wide ]

Human Clock - People in various situations holding signs of the time. Accepts photo submissions.

International Time Offset - A table showing time in relation to GMT, US Eastern, US Central, US Mountain, and US Pacific Time.
Meta Description: [ time zone, time zones, world, international ]

Local Times around the World - Database of countries, islands and regions, containing current time and related information.

Official U.S. Time - Public service cooperatively provided by the National Institute of Standards and Technology (NIST) and U. S. Naval Observatory (USNO). Clickable map of U.S.A. (Java Applet), gives the current time plus a world map showing current daylight.
Meta Description: [ The official U.S. time. Public service cooperatively provided by the two time agencies of United States: a civilian agency, the National Institute of Standards and Technology (NIST), and its military counterpart, the U. S. Naval Observatory (USNO). Also historical and general interest exhibits. ]

People-Park Time Zones - Choose a world region and get a list with the current time ticking for each and every country in that region.

Summer Time, DST - Article from Royal Observatory Greenwich on European summer time, daylight saving time.
Meta Description: [ Each year Greenwich Mean Time (GMT) operates during the winter months and British Summer Time (BST) operates during the summer. Find out more about daylight saving time and the dates the clocks should be moved back and forth over the next few years here. ]

The Time Now - Choose a country and get the accurate (US network of cesium clocks) synchronized time.
Meta Description: [ accurate time for all time zones. A great bookmark for travellers ]

Time and Date - Current time in tables of places in the world. Can be sorted and otherwise customized. Includes meeting planner and other time-related tools.
Meta Description: [ The World Clock shows current local time in cities and countries, in all time zones. ]

Time Zone Converter - Find the current time from a list of cities. Convert time between time zones (cities), or create a printable reference card with base reference and cities of your interest.
Meta Description: [ Time and time zone converter. Readily tell the time anywhere in the world using our frequently updated time zone database. ]

Time Zones Of The World - Live analog clocks provide fast local timechecks for 30 worldwide timezones. Based on PC program CLOX 2000.
Meta Description: [ The world's timezones displayed on one web page. Includes North and South American time zones, European time clocks and clocks for, Asia, Australasia and world islands. ]

Timeticker - GMT offset via Flash rollover world map. Lists all countries in the world, and returns ticking accurate current time.
Meta Description: [ Timeticker - The exact time of the world. A full featured Multimedia-Site created with Flash by Martin Zwernemann. You need the Shockwave-Plugin to see. Have fun! ]

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United States Time Zones - Provides current local time and a quick loading time zone map of the entire United States.
Meta Description: [ Time zone and current times for all of the United States and Canada including information about daylight savings time and gmt ]

UTC - Current time UTC and current moon phase. Internal link to UTC definition and origin.

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What Time? - Minimalistic converter.

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World Map Clock - Full world overview of current local time, 2 days of week plus day and night. Print version can work as slideruler.
Meta Description: [ Timezone map/worldclock. No converting, counting or clicking around. No search in lists needed. Instant readout and clear overview of current lokal times, lokal days of week and lokal day or night. Free downloads too! Produce your own worldtime slideruler ]

World Time - Interactive globe image that can be centered with a click or by choosing a country. Current time for the map center will show as offset from UTC. Settings like zoom factor, color and state borders can be customized.
Meta Description: [ WORLDTIME is a service featuring an interactive world atlas and information on local time as well as sunrise and sunset times in several hundred cities worldwide. ]

World Time Server - Look up current time from database containing any country or major city in the world. Displays the time, the GMT offset, a globe image, and a section map. Features a world time calculator and a freeware utility to synchronize your PC with an atomic clock.
Meta Description: [ Falkland Islands (Malvinas) - before placing a telephone call or making travel plans for a flight or hotel, get the current local time provided by WorldTimeServer.com ]

World Time Zone - A world map with inserted clocks for every time zone in the world.
Meta Description: [ World Time Zones and time map with current time around the World and countries operating Daylight Savings Time sunclock map shows what part of the world is in darkness and what part is in daylight detailed time zone maps of the USA time Europe time Australia time Canada time Middle-East time Ocea... ]

World Time Zone Map - Black and white map, using the standard time zone names (A - Z). Available in 3 different file types.

Z-Time - Article on the time at 0 degrees longitude. Covers the timezone origin, GMT, UTC, GCT, ZULU and JIG.
Meta Description: [ The origin of the expression Z-Time, for Greenwich Mean Time. ]

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