Udp Time

Question

ADDQUESTION

Solution

from socket import *
from struct import unpack
from time import ctime, sleep
from sys import argv

argv = argv[1:]
if len(argv) == 0:
   argv = [ 'time-nw.nist.gov' ]

s = socket(AF_INET, SOCK_DGRAM)
s.settimeout(5.0)

for server in argv:
   print(server, ":", end=' ')
   try:
       s.sendto('', 0, (server, 37))
       t = int(unpack('!L', s.recv(16)[:4])[0])
       # Convert from 1900/01/01 epoch to 1970/01/01 epoch
       t -= 2208988800
       print(ctime(t))
   except timeout:
       print("TIMEOUT")
   except:
       print("ERROR")

s.close()