python获取服务器端的时间

import httplib
import time
import os
def get_webservertime(host):
    try:
        conn=httplib.HTTPConnection(host)
        conn.request("GET", "/")
        r=conn.getresponse()
        #r.getheaders() #获取所有的http头
        ts=  r.getheader('date') #获取http头date部分
        print '============================'
        print ts
        print '============================'
        #将GMT时间转换成北京时间
        ltime= time.strptime(ts[5:25], "%d %b %Y %H:%M:%S")
        #print(ltime)
        ttime=time.localtime(time.mktime(ltime)+8*60*60)
        #print(ttime)
        dat="date %u-%02u-%02u"%(ttime.tm_year,ttime.tm_mon,ttime.tm_mday)
        tm="time %02u:%02u:%02u"%(ttime.tm_hour,ttime.tm_min,ttime.tm_sec)
        currenttime="%u-%02u-%02u %02u:%02u:%02u"%(ttime.tm_year,ttime.tm_mon,ttime.tm_mday,ttime.tm_hour,ttime.tm_min,ttime.tm_sec)
        print currenttime
        print (dat,tm)
        os.system(dat)
        os.system(tm)
    except:
        return False
    
get_webservertime('www.baidu.com')