# _*_ coding: utf-8 _*_
import re
from datetime import datetime, timezone, timedelta

def to_timestamp(dt_str, tz_str):
    group=re.match(r'^UTC([\+|-]\d{1,2}):00$', tz_str)
    return datetime.strptime(dt_str, '%Y-%m-%d %H:%M:%S').replace(tzinfo=timezone(timedelta(hours=int(group[1])))).timestamp()

t1 = to_timestamp('2015-6-1 08:10:30', 'UTC+7:00')
assert t1 == 1433121030.0, t1

t2 = to_timestamp('2015-5-31 16:10:30', 'UTC-09:00')
assert t2 == 1433121030.0, t2

print('ok')