* reduce number of patterns: using localised month names is useless
since we're not setting the locale so it always uses the server's own
* avoid going through the entire strptime machinery: lift the bits of
TimeRE we're interested in to get regex bits out of strptime patterns
and just to an re.match to check whether value & pattern match
Further possible optimisation: cache REs and only compile user-provided
patterns dynamically.
Xavier Morel
139aa9367d