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It used to be you could call an Archetypes's DateTimeField mutator method with
a string like::
'2011-05-04T13:29:26.311Z'
However, the alleged "fix" to http://dev.plone.org/plone/ticket/10141 broke
that. This release works around that problem by chopping off milliseconds
(and UTC "zulu" indicator) before passing the string onto the mutator.