Daylight Savings Time

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http://www.webexhibits.org/daylightsaving/b.html

http://aa.usno.navy.mil/faq/docs/daylight_time.php

http://en.wikipedia.org/wiki/Daylight_saving_time

http://news.nationalgeographic.com/news/2009/10/091026-daylight-savings-time-2009-fall-back.html