import datetime, OpenSSL, socket, ssl

def ssl_wrap_socket(sock, server_hostname):

 context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)

 if ssl.HAS_SNI:
  return context.wrap_socket(sock, server_hostname=server_hostname)
 return context.wrap_socket(sock)

def getRemoteCert(host, port):
 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 s.connect((host, 443))

 sslSocket = ssl_wrap_socket(s, host)

 return sslSocket.getpeercert()

def getRemoteExpiry(host,port):
 return datetime.datetime.strptime(str(OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, getRemoteCert(host, port)).get_notAfter().decode("UTF-8")), "%Y%m%d%H%M%SZ")