Python转换GMT时间为时间戳，并计算时间差

Apache日志中的时间是GMT格式，如下：

[Fri Oct 20 06:26:24 2017] [error] Server certificate is expired: 'Server-Cert'

用Python转换时间戳，和系统时间比较时间差的代码如下：

import timetime.ctime(time.time())#'Tue Oct 31 15:38:18 2017'time.mktime(time.strptime(time.ctime(time.time()),"%a %b %d %H:%M:%S %Y"))time.mktime(time.strptime("Tue Oct 31 15:38:18 2017","%a %b %d %H:%M:%S %Y"))#计算时间差int(time.mktime(time.strptime(time.ctime(time.time()),"%a %b %d %H:%M:%S %Y"))-time.mktime(time.strptime("Tue Oct 31 15:38:18 2017","%a %b %d %H:%M:%S %Y")))