Print how many days left until an SSL certificate file expires. Usage: ssl_expire_days.py CERTFILE

ssl_expire_days.py

import time
import datetime
import subprocess
import sys

cert = sys.argv[1]
date_format = "%m/%d/%Y"
p = subprocess.Popen("openssl x509 -noout -in " + cert + " -enddate | sed 's/^[a-zA-Z]*=//g' | xargs --null date +" + date_format\
 + " -d",stdout=subprocess.PIPE, shell=True)
(output, err) = p.communicate()
if output:
    output = output.rstrip("\n")
    d0 = datetime.datetime.today()
    d1 = datetime.datetime(*(time.strptime(output, date_format)[0:3]))
    delta = d1 - d0
    print(delta.days)
else:
    print("Usage: python ssl_expires_days.py certfile");

Now works with both python 2.4 and 2.7