Using date in start_date breaks

[criccomini]

Using date.today() in start_date breaks. This code:

def json_ser(obj):
    """
    json serializer that deals with dates
    usage: json.dumps(object, default=utils.json_ser)
    """
    if isinstance(obj, (datetime, date)):
        return obj.isoformat()

Causes a Circular reference detected error to be thrown. Switching to datetime.now().replace(hour=0, minute=0, second=0, microsecond=0) makes this error go away.