Mock datetime.now() for testing

gistfile1.py

class FakeDatetimeFactory(object):
    """Factory to help testing logic depending on ``datetime.now()``.              
                                                                                   
    """
    @classmethod
    def now(self, *args, **kwargs):

        class FakeDatetime(datetime):
            """Datetime class with overriden ``now()`` method."""

            @classmethod
            def now(cls):
		return cls(*args, **kwargs)
	return FakeDatetime