Flexible English date phrase library for Python?

I'm looking for a function that can convert an English date phrase 开发者_如何转开发to some kind of Python date object representing the appropriate date.

An example of the kinds of things I'm looking for (though I'm flexible):

• Three days from now
• yesterday
• In a month
• Next year
• January 18, 2011
• Next Wednesday

Is there such a thing? Is there one perhaps in another language?

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parsedatetime, always a classic: http://code.google.com/p/parsedatetime/

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I think the best bet here would be the mxDateTime. The documentation seems to suggest that it does what you're looking for.