* 由于NTP时间同步，如果相差比如有好几个小时，那么时间不同步矫正回来其实是非常慢的；我本次主要就是讲第2种方案，通过Python来实现的，可以直接设置为互联网上的时间。
代码见：https://github.com/smilejay/python/blob/master/py2018/set_check_localtime.py
# -*- coding: utf-8 import sysimport timeimport subprocessimport argparseimport urllib2 def set_beijing_time_from_web(url): ''' set os and hardware clock as beijing time from internet ''' # use urllib2 in python2; not use requests which need installation response = urllib2.urlopen(url) #print response.read() # 获取http头date部分 ts = response.headers['date'] # 将日期时间字符转化为time gmt_time = time.strptime(ts[5:25], "%d %b %Y %H:%M:%S") # 将GMT时间转换成北京时间 local_time = time.localtime(time.mktime(gmt_time) + 8*3600) str1 = "%u-%02u-%02u" % (local_time.tm_year, local_time.tm_mon, local_time.tm_mday) str2 = "%02u:%02u:%02u" % ( local_time.tm_hour, local_time.tm_min, local_time.tm_sec) cmd = 'date -s "%s %s"' % (str1, str2) #print cmd subprocess.check_call(cmd, shell=True) hw_cmd = 'hwclock -w' #print hw_cmd subprocess.check_call(hw_cmd, shell=True) print 'OK. set time: %s' % ' '.join([str1, str2]) def check_localtime_with_internet(url): ''' check local time with internet ''' threshold = 2 # use urllib2 in python2; not use requests which need installation response = urllib2.urlopen(url) #print response.read() # 获取http头date部分 ts = response.headers['date'] # 将日期时间字符转化为time gmt_time = time.strptime(ts[5:25], "%d %b %Y %H:%M:%S") # 将GMT时间转换成北京时间 internet_ts = time.mktime(gmt_time) local_ts = time.mktime(time.gmtime()) if abs(local_ts - internet_ts) <= threshold: print 'OK. check localtime.' else: print 'ERROR! local_ts: %s internet_ts:%s' % (local_ts, internet_ts) sys.exit(1) if __name__ == '__main__': url = 'http://www.baidu.com' parser = argparse.ArgumentParser() parser.description = 'set/check localtime (i.e. CST) with internet' parser.add_argument('-c', '--check', action='store_true', help='only check local time') parser.add_argument('-s', '--set', action='store_true', help='only set local time') parser.add_argument('-u', '--url', default=url, help='the url to sync time') args = parser.parse_args() if args.set: set_beijing_time_from_web(args.url) else: check_localtime_with_internet(args.url) 
