def print_valid_time(prefix: str, cert: X509) -> None:
"""Print validity time of the certificate"""
validfrom_time = cert.get_notBefore()
validfrom_datetime = datetime.strptime(validfrom_time.decode("utf-8"),
"%Y%m%d%H%M%SZ")
validto_time = cert.get_notAfter()
validto_datetime = datetime.strptime(validto_time.decode("utf-8"),
"%Y%m%d%H%M%SZ")
print(f"{prefix}valid from: {validfrom_datetime}")
print(f"{prefix}valid to : {validto_datetime}")
