1.
dateutil - The dateutil module provides powerful extensions to the standard datetime module, available in Python 2.3+.
http://labix.org/python-dateutil
2.
vobject - object is intended to be a full featured Python package for parsing and generating vCard and vCalendar files. It is being developed in concert with the Open Source Application Foundation's Chandler project.
http://vobject.skyhouseconsulting.com/