def to_timestamp(dt_str, tz_str):
    cday = datetime.strptime(dt_str, '%Y-%m-%d %H:%M:%S') #str -> datetime
    re_tz = re.match('UTC(\+|\-)(0?\d):00',tz_str).groups() #re tz_str
    tz_utc_x = timezone(timedelta(hours=int(re_tz[0]+re_tz[1]))) #set tz_zone
    dt = cday.replace(tzinfo=tz_utc_x) #set datetime 
    print(dt.timestamp())
    return dt.timestamp()