Date index methods works even if source field is a dexterity field
  wich provides a  datetime python value.
typo
optim
fix: datetime is a date instance
test datetimes, with timezones
Update CHANGES.rst
Merge pull request #16 from tdesvenain/master

 Date index methods works even if source field is a dexterity field.
Now you can manually add a field with the name of a common Plone metadata field