# -*- coding: utf-8 -*-

import re
from datetime import datetime, timezone, timedelta

def to_timestamp(dt_str, tz_str):
    utct = int(re.split(r'\:',tz_str)[0][3:])
    utc = timezone(timedelta(hours=utct))
    res = datetime.strptime(dt_str, '%Y-%m-%d %H:%M:%S').replace(tzinfo=utc)
    return res.timestamp()

# 测试:
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('Pass')