Clock script

clock.py

import re, math, time, urllib, locale, socket, struct, datetime
from decimal import Decimal as dec

while True: 
   client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
   client.sendto('\x1b' + 47 * '\0', ('ntp1.npl.co.uk', 123))
   data, address = client.recvfrom(1024)
   if data: 
      buf = struct.unpack('B' * 48, data)
      d = dec('0.0')
      for i in range(8):
         d += dec(buf[32 + i]) * dec(str(math.pow(2, (3 - i) * 8)))
      d -= dec(2208988800L)
      a, b = str(d).split('.')
      f = '%Y-%m-%d %H:%M:%S'
      result = datetime.datetime.fromtimestamp(d).strftime(f) + '.' + b[:6]
      print result + ' - ntp1.npl.co.uk'
   time.sleep(0.5)