import java.net.*;
import java.io.*;
import java.util.Date;
 
public class DaytimeServer {
 
  public final static int DEFAULT_PORT = 13;

  public static void main(String[] args) {

   int port = DEFAULT_PORT;     
   if (args.length > 0) {
     try {
        port = Integer.parseInt(args[0]);
        if (port < 0 || port >= 65536) {
          System.out.println("Port must between 0 and 65535");
          return;      
        }
     }   
     catch (NumberFormatException ex) {
       // use default port
     }  

   }     

   try {
    
     ServerSocket server = new ServerSocket(port);
      
     Socket connection = null;
     while (true) {
        
       try {
         connection = server.accept();
         Writer out = new OutputStreamWriter(connection.getOutputStream());
         Date now = new Date();
         out.write(now.toString() +"\r\n");
         out.flush();      
         connection.close();
       }
       catch (IOException ex) {}
       finally {
         try {
           if (connection != null) connection.close();
         }
         catch (IOException ex) {}          
       }
         
     }  // end while
       
   }  // end try
   catch (IOException ex) {
     System.err.println(ex);
   } // end catch

  } // end main

} // end DaytimeServer