如何使用Internet时间服务器来获取时间？ [英] How to use an Internet time server to get the time?

问题描述

我想获得GMT [格林威治标准时间]，我也不想依赖于我的系统日期时间。基本上，我想使用时间同步服务器，如 in.pool.ntp.org [印度] GMT计算，或者可能是我错误的方向!!!

如何在java中执行此操作？

I would like to get the GMT [ Greenwich Mean Time ], and also i don't want to rely on my system date time for that. Basically, I want to use time sync server like in.pool.ntp.org [ india ] for GMT calculation, or may be i am going in wrong direction!!!
How to do this in java ?

是否有任何Java库从Time服务器获取时间？

Is there any java library to get time from Time server?

推荐答案

sp0d不太正确：

timeInfo.getReturnTime(); // Returns time at which time message packet was received by local machine

所以它只返回当前系统时间，而不是收到的。请参阅 TimeInfo man页面。

您应该使用

So it just returns current system time, not the received one. See TimeInfo man page.
You should use

timeInfo.getMessage().getTransmitTimeStamp().getTime();

代替。

所以代码块将是：

instead.
So the code block will be:

String TIME_SERVER = "time-a.nist.gov";   
NTPUDPClient timeClient = new NTPUDPClient();
InetAddress inetAddress = InetAddress.getByName(TIME_SERVER);
TimeInfo timeInfo = timeClient.getTime(inetAddress);
long returnTime = timeInfo.getMessage().getTransmitTimeStamp().getTime();
Date time = new Date(returnTime);

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