Rails gives you the possibility to include a field in your tables with
the date in wich a record has been updated: updated-at. Well, I can
access this filed via xml (I'm developing an Ajax application) so I
have it in plain text form and looks something like this:
Date.parse('2008-07-05T19:47:32+02:00') // DOESN'T WORK
But before I resort to write (and then test) my own parser, I would
some extern library or, at least, the name for this particular format
so I can Google it.