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')