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

import re,string
from datetime import datetime, timezone, timedelta

def to_timestamp(dt_str, tz_str):
    timetemp=datetime.strptime(dt_str,'%Y-%m-%d %H:%M:%S')
    ret=re.match(r'^UTC([+|-])(\d+):00$',tz_str)
    tzn=(int)(ret.group(2))
    if ret.group(1)=='+':
        tz=tzn
    elif ret.group(1)=='-':
        tz=-1*tzn

    restt=timetemp.replace(tzinfo=timezone(timedelta(hours=tz)))
    return restt.timestamp()
t1 = to_timestamp('2015-6-1 08:10:30', 'UTC+7:00')
print(t1)
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