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socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

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from urllib import urlopen
from time import time
from os import system

def ask_time( url, tzn, tz2=None ):
  """Get time from the Internet.
  # url must be e.g. http://tycho.usno.navy.mil/cgi-bin/timer.pl :-)
  # tzn must be UTC,EST,PST,etc.
  #     UTC will return time like "22:30:40 UT"
  #     Other options return like "05:30:40 PM" i.e. with AM/PM
  # tz2 can be another time zone, e.g. EDT,PDT,etc.
  #Returns "HH:MM:SS AA" or empty string if any failure.
  """
  try:
    doc = urlopen( url ).readlines()
    #<TITLE>What time is it?</TITLE>
    #<H2> US Naval Observatory Master Clock Time</H2> <H3>
    #<BR>Apr. 30, 20:01:28 UTC
    #<BR>Apr. 30, 04:01:28 PM EDT
    #....
    for line in doc:
      line = line.strip()
      if line.endswith( tzn ) or (tz2 and line.endswith( tz2 )):
        col = line.index(':')
        return line[col-2:col+9] # 04:01:28 PM (or 22:30:40 UT)
  except:
    pass
  return ''

def synch_time( url, tz, tz2=None ):
  time_str = ask_time( url, tz, tz2 )
  if time_str:
    try:
      before = time()
      system( 'time ' + time_str ) # do synchronize!
      delta = time() - before
      return "Time is %s\nCorrected by %.1f sec" % (time_str,delta)
    except:
      pass
  return 'Not synchronized'

if __name__ == "__main__":
  from win32ui import MessageBox
  rc = synch_time( "http://tycho.usno.navy.mil/cgi-bin/timer.pl", "EST", "EDT" )
  MessageBox( rc, "synch_time" )

# EOF