Convert a string representation of the time (as returned by blockr.io api) into unix
        timestamp

        :param time_utc_str: string representation of the time
        :return: unix timestamp

def _convert_time(self, time_str):
        """
        Convert a string representation of the time (as returned by blockr.io api) into unix
        timestamp

        :param time_utc_str: string representation of the time
        :return: unix timestamp
        """
        dt = datetime.strptime(time_str, "%Y-%m-%dT%H:%M:%SZ")
        return int(time.mktime(dt.utctimetuple()))