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DateInterval.py

Convert interval strings (in the form of 1w2d, etc) to
seconds, and back again.  Is not exactly about months or
years (leap years in particular).

Accepts (y)ear, (b)month, (w)eek, (d)ay, (h)our, (m)inute, (s)econd.

Exports only timeEncode and timeDecode functions.  
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