时间戳和字符串之间的转化

参考：https://www.liaoxuefeng.com/wiki/1016959663602400/1017648783851616

import datetime

def str_to_timestamp(t):
    t_datetime = datetime.datetime.strptime(t, '%Y-%m-%d %H:%M:%S')
    timeStamp = int(datetime.datetime.timestamp(t_datetime)*1000)
    return timeStamp

def timestamp_to_str(timestamp):
    t_str = datetime.datetime.fromtimestamp(timestamp/1000).strftime('%Y-%m-%d %H:%M:%S')
    return t_str

t = str_to_timestamp('2010-2-5 9:2:2')  #1265331722000
t1 = timestamp_to_str(1265331722000)    #2010-02-05 09:02:02