mxDateTimeField
mxDateTimeField is an archetypes field that can store date information in a wider range than the original date field that comes with plone...
You can find mxDateTimeField here:
https://svn.plone.org/svn/archetypes/MoreFieldsAndWidgets/MxDateTimeField/
It uses mxDateTime internally to store date information. You might want to use this field if you have to handle historical data.