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TimeClient class that uses Time protocol

Roger Fed
Ranch Hand

Joined: Oct 17, 2010
Posts: 82

I've developed this This client class that tries to connect to time protocol on port 37

but it give me this error
java.net.UnknownHostException: time.nist.gov
I'd be grateful if you can help me?
thanks in advance..........................

I Hear I Forget, I See I Remember, I Do I Understand.
Ulf Dittmer
Rancher

Joined: Mar 22, 2005
Posts: 42956
    
  73
Have you tried any other servers, like the ones listed in http://tf.nist.gov/tf-cgi/servers.cgi ?

Not sure if that particular server usually responds to ping, but right now it doesn't.
Roger Fed
Ranch Hand

Joined: Oct 17, 2010
Posts: 82

Thanks Ulf Dittmer for your valuable help, I've tried another server and it works well but I have one question concerning this code:
Can you explain to me what this line do???
Ulf Dittmer
Rancher

Joined: Mar 22, 2005
Posts: 42956
    
  73
It looks like the server returns the seconds since the epoch (1.1.1970) as a 4-byte value. That's actually all the server returns according to the RFC that specifies the time protocol.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: TimeClient class that uses Time protocol