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Lots of time and date related information, such as yearly and monthly calendars, counters, countdown, and the world clock which shows the current time in cities all over the world.
http://www.timeanddate.com/
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An online handy tool for converting to and from the Gregorian, Julian and Jewish calendars.
http://rosettacalendar.com/
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Explains the difference between millenium and year 2000 as the absence of a year zero.
http://www.millenniummistake.net/
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The calendar was the center of Maya life and their greatest cultural achievement. To carry out their astronomical calculations they developed a sophisticated mathematical system. The Maya Calendar website is developing with the intent of providing a complete view of Maya culture.
http://mayacalendar.com
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Complete guide to times in every time zone in the world.
http://GreenwichMeanTime.info
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CalSKY</a> - The worldwide interactive online astronomical/space calendar and calculator - for friends of astronomy, as well as astronomers.
http://www.calsky.com/
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The calendar has many options with a standard monthly interface, including sunrise, sunset, and Moon phases.
http://www.acalendar.com/
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