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The phrase Epoch is commonly used to describe the date and time that is represented by the number "0".

The following Epochs are known:

Applications Date and Time Reference
Microsoft Windows January 1, 1601 GMT http://blogs.msdn.com/oldnewthing/archive/2009/03/06/9461176.aspx
Unix File Systems January 1, 1970 GMT
Apple File Systems January 1, 1904 GMT http://developer.apple.com/technotes/tn/tn1150.html#HFSPlusDates
Palm OS January 1, 1904 GMT