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An overview of the ISO 8601 notation for dates.
http://www.cl.cam.ac.uk/~mgk25/iso-time.html
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History of standard time in the U.S.
http://aa.usno.navy.mil/faq/docs/us_tzones.html
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Evolution of timekeeping through the centuries.
http://physics.nist.gov/GenInt/Time/time.html
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The National Institute of Standards and Technology maintains time and frequency standards for the United States.
http://www.boulder.nist.gov/timefreq/
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