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How,in Java, do I obtain NTP time from one of the US time servers (us.pool.ntp.org)?

Posted on 2015-02-13
Medium Priority
Last Modified: 2015-03-03
I need to obtain time from an ntp server in my Java program.

How do I do that?


Question by:Christopher Schene
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LVL 36

Assisted Solution

mccarl earned 800 total points
ID: 40609288
There is nothing builtin to Java to do this, so you would manually have to create and send the right request packets and then decode the response... or you can use a library like Apache Commons Net (http://commons.apache.org/proper/commons-net/)

The page linked to above has downloads for the library (or details for getting via Maven if you use it) and also in the main info of the page is a link to an example for doing exactly what you are after. Have a go with all that and if there are any problems let us know.
LVL 14

Expert Comment

ID: 40610084
There are examples for to query a NTP server for the time around on the net, I've seen one on stackoverflow.com, written in C#. Shouldn't be that much complicated to port to Java.

Just search for "query NTP server socket" on Google. Sorry for not posting the code itself, but I don't want to publish other people's code under my name.

Author Comment

by:Christopher Schene
ID: 40610506
Thanks for your advice.

With respect I pay for EE membership precisely because I generally do not wish to do the leg work of finding answers to my Java language question,  I am sure I will eventually be able to figure this out on my own if I've no other choice but I would rather something close to an answer. I can probably translate .net or c++ answers to Java.

I will look at the common library and see if there is something there I can use, but if I figure out the answer I split credit between the expert and myself with me getting most of the points.
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LVL 36

Expert Comment

ID: 40610697
Also with respect, I can't download the library for you and if you are after code that is a bit more specific to your situation than the example, then you would actually have had to give us more details about your situation.

If you were after a solution that didn't involve using a 3rd party library, then it maybe a good idea to state that in your initial question, or at least in a comment prior to making threats of splitting points, etc.
LVL 14

Expert Comment

ID: 40610972
With respect, too, I did most of the legwork for you ... I just don't want to put another man's feathers on my hat. I've found a nice and short example code in C#, and I pointed you right the way to it ...

Accepted Solution

Christopher Schene earned 0 total points
ID: 40615819
I found this java example though I have not tried it yet.
LVL 36

Expert Comment

ID: 40615823
That is exactly what I was referring to in my initial comment, ie. that is the example off the Apache Commons Net page and to use it requires downloading the library.

Author Closing Comment

by:Christopher Schene
ID: 40641311
I did most of the work: I found the example on the net. the other experts made suggestions and provided a link.

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