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 e) {
// use default port
      }
    }
    System.out.println("Daytime server at port:");
    try {
      ServerSocket server = new ServerSocket(port);
      Socket connection = null;
      while (true) {
        try {
          connection = server.accept();
          System.out.println("Incomming request\n\r");
          OutputStreamWriter out
            = new OutputStreamWriter(connection.getOutputStream());
          Date now = new Date();
          out.write(now.toString() +"\r\n");
          out.flush();
          connection.close();
        }
        catch (IOException e) {}
        finally {
        try {
          if (connection != null) connection.close();
        }
        catch (IOException e) {}
        }
      } // end while
    } // end try
    catch (IOException e) {
      System.err.println(e);
    } // end catch
  } // end main
} // end DaytimeServer