echo | openssl s_client -servername www.baidu.com -connect www.baidu.com:443 2>/dev/null | openssl x509 -noout -dates|egrep ‘notAfter'|awk -F'=|GMT' ‘{print $2}'

#!/usr/bin/python
# -*- coding: utf-8 -*-
# author: chentufeng
# create time: 2020 12 25
import commands,os
script_sh = ".tmp.sh"
# 自动生成shell脚本用来执行shell命令获取时间
def init_sh():
  if not os.path.exists(script_sh):
    with open(script_sh, 'w') as file_object:
      file_object.write("yuming=$1\ntag=$2\n"
      "ymtime=`echo | openssl s_client -servername $yuming -connect $yuming:443 2>/dev/null | openssl x509 -noout -dates|egrep \"$tag\"|awk -F'=|GMT' '{print $2}'`\n"
      #时间转换，如果需要也可以转换成其他格式
      "date -d \"$ymtime\" '+%Y-%m-%d %H:%M:%S'\n")
if __name__ == '__main__':
  #初始化函数
  init_sh()
  yuming = "www.baidu.com"
  tag = "notBefore" #notBefore 开始时间；notAfter 到期时间
  cmd = "sh %s %s %s"%(script_sh, yuming, tag)
  restatus,retime = commands.getstatusoutput(cmd)
  print("获取的时间:%s"%retime)