def to_timestamp(dt_str, tz_str):   symbolnum = re.match(r'UTC([\+\-])(\d+?)\:\d+', tz_str).groups()   my_hours = symbolnum[0].lstrip('+') + symbolnum[1]   tz_utc = timezone(timedelta(hours = int(my_hours)))   cday = datetime.strptime(dt_str, '%Y-%m-%d %H:%M:%S')   dtnow = cday.replace(tzinfo = tz_utc)   return dtnow.timestamp()