TSergey, 2014-11-19, json timestamp error

    # /lib/app/application.py
    def to_json(self, v):
        """
        Convert custom types to json string
        :param v:
        :return:
        """
        if v is None:
            return None
        elif isinstance(v, datetime.datetime):
            if hasattr(self.TZ, 'localize'):
                return self.TZ.localize(v).isoformat()
            else:
                return v.replace(tzinfo=self.TZ).isoformat()
        else:
            raise Exception("Invalid to_json type")