UTC与本地时间字符串互相转换

#!/usr/bin/env python
import time
import datetime

# 格式自改
UTC_FORMAT = '%Y-%m-%dT%H:%M:%SZ'
LOCAL_FORMAT = '%Y-%m-%d %H:%M:%S'


def utc2local(utc_str):
    utc_st = datetime.datetime.strptime(utc_str, UTC_FORMAT)
    local_time = datetime.datetime.fromtimestamp(time.time())
    utc_time = datetime.datetime.utcfromtimestamp(time.time())
    time_difference = local_time - utc_time
    local_st = utc_st + time_difference
    return local_st.strftime(LOCAL_FORMAT)


def local2utc(local_str):
    local_st = datetime.datetime.strptime(local_str, LOCAL_FORMAT)
    time_struct = time.mktime(local_st.timetuple())
    utc_st = datetime.datetime.utcfromtimestamp(time_struct)
    return utc_st.strftime(UTC_FORMAT)


local_time = utc2local('2017-03-21T02:05:53Z')
print(local_time)

utc_time = local2utc('2017-03-21 10:05:53')
print(utc_time)