Utility script monitoring TLS/SSL cert expiration dates and running automated Certbot renewals.
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Extract expiration dates from local SSL .pem files using OpenSSL command CLI calls.
import subprocess
from datetime import datetime
def get_cert_expiry_date(cert_path: str) -> datetime:
cmd = f"openssl x509 -enddate -noout -in {cert_path}"
output = subprocess.check_output(cmd, shell=True).decode('utf-8')
# Output format: notAfter=May 15 12:00:00 2026 GMT
date_str = output.split('=')[1].strip()
return datetime.strptime(date_str, "%b %d %H:%M:%S %Y %Z")
def get_days_until_expiry(cert_path: str) -> int:
expiry = get_cert_expiry_date(cert_path)
delta = expiry - datetime.utcnow()
return delta.daysReal issues students hit during development and how to troubleshoot them fast.
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