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> But the main problem is parse() for parsing "approximate dates" like
> "week ago" or "tomorrow".

GNU date accepts these with the -d option:
http://www.gnu.org/software/coreutils/manual/html_node/Examples-of-date.html

OS X date accepts a symbolic version with the -v option.

It'll probably be profitable to look at their source code.
With some luck, GNU date is based on a library that can be reused.