时间 网络

网络校时.py

# -*- coding: utf-8 -*-  
import socket,sys,time  
#时间服务器  
host = "stdtime.gov.hk"  
#端口  
port = 37  
#时区  
curtz = 8  
#连接服务器,并接收返回  
try:  
        host = socket.gethostbyname(host)  
        s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)  
        s.settimeout(2)  
        s.sendto("",(host,port))  
        buf = s.recvfrom(10)[0]  
except socket.timeout,ex:  
        print 'socket error! timeout'  
        sys.exit(1)  
except socket.gaierror,ex:  
        print 'socket error! gaierror'  
        sys.exit(1)  
if len(buf) < 4:  
        print 'read data error'  
        sys.exit(1)  
#计算返回的自 1900-1-1 00:00:00 的秒数  
secs = ord(buf[0])*pow(256,3)+ord(buf[1])*pow(256,2)+ord(buf[2])*pow(256,1)+ord(buf[3])  
ts = time.gmtime(secs - 2208988800+curtz*3600)  
#time 是从1970-1-1 00:00:00 算起的 1970-1-1 00:00:00 是秒数是 2208988800s  
print time.strftime("%Y-%m-%d %H:%I:%S", ts)  
print time.strftime("%Y-%m-%d %H:%I:%S")  
#附 Time Server:  
''''' 
    clock.psu.edu 
    ntp0.cornell.edu 
    salmon.maths.tcd.ie 
    stdtime.gov.hk 
'''