def to_timestamp(dt_str, tz_str):
    dt = datetime.strptime(dt_str, '%Y-%m-%d %H:%M:%S')
    atime = dt.replace(tzinfo = timezone(timedelta(hours = int(re.match(r'^(UTC)([\+|\-]?[0-9]+)(.*)', tz_str).group(2)))))

    return atime.timestamp()