def to_timestamp(dt_str, tz_str):
    dt_utc8 = datetime.strptime(dt_str, '%Y-%m-%d %H:%M:%S')
# 先得到utc8的datetime    dt_utc8_stamp = dt_utc8.timestamp()
# 得到utc8的timestamp    tz = re.compile(r'^UTC(.)(\d+):00$')
# 用正则表达式获取UTC信息：1.+or- 2.哪个区    tz_delta = int(tz.match(tz_str).group(2))
# tz_delta是UTC的值，这个地方一定注意要取int，否则会报错（int与str类型相加）    if tz.match(tz_str).group(1) == '-':
# 如果是utc是负：        dt_utc8_stamp = dt_utc8_stamp + (8+tz_delta)*3600    if tz.match(tz_str).group(1) == '+':
        dt_utc8_stamp = dt_utc8_stamp - (tz_delta - 8)*3600    return dt_utc8_stamp


# 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('ok')