def to_timestamp(dt_str, tz_str):
    cday = datetime.strptime(dt_str, '%Y-%m-%d %H:%M:%S')
    tz = int(tz_str[tz_str.index('C')+1:tz_str.index(':')])
    tz_utc = timezone(timedelta(hours=tz))
    time_now = cday.replace(tzinfo=tz_utc)
    return time_now.timestamp()