Class that helps to serialize Python datetime/date/timedelta class

DateTimeAwareJSONEncoder.py

class DateTimeAwareJSONEncoder(json.JSONEncoder):
    """
        A JSONEncoder subclass for handling objects of types `timedelta`, `datetime` and `date`
    """
    def default(self, obj):
        if isinstance(obj, datetime):
            return {
                '__type__': 'datetime',
                'year': obj.year,
                'month': obj.month,
                'day': obj.day,
                'hour': obj.hour,
                'minute': obj.minute,
                'second': obj.second,
            }
        elif isinstance(obj, date):
            return {
                '__type__': 'date',
                'year': obj.year,
                'month': obj.month,
                'day': obj.day,
                }
        elif isinstance(obj, timedelta):
            return {
                '__type__': 'timedelta',
                'days': obj.days,
                'seconds': obj.seconds,
            }
        else:
            return json.JSONEncoder.default(self, obj)

nice work