using UnityEngine;
using System.Collections;
using UnityEngine.UI;


public class NewBehaviourScript : MonoBehaviour
{

    // Use this for initialization
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {
        Text mytxt = GameObject.Find("Canvas/Panel/Text").GetComponent<Text>();
        mytxt.text = System.DateTime.Now.ToString();
            }

    public void myfun()
    {
    }
}

=======================================================================

using UnityEngine;

using System.Collections;

using UnityEngine.UI;

public class NewBehaviourScript1 : MonoBehaviour {

// Use this for initialization

void Start () {

}

// Update is called once per frame

void Update () {

}

    public void myfun()

    {

        Text mytxt = GameObject.Find("Canvas/Panel/Text (1)").GetComponent<Text>();

        mytxt.text = Time.time.ToString();

        Time.timeScale = 0;

    }

}=======================================================================

using UnityEngine;

using System.Collections;

using UnityEngine.UI;

public class NewBehaviourScript2 : MonoBehaviour

{

    public bool timerOn = true;

    float time;

    // Use this for initialization

    void Start()

    {

        if (timerOn)

        {

            time += Time.deltaTime;

        }

        Text mytxt = GameObject.Find("Canvas/Panel/Text").GetComponent<Text>();

        mytxt.text = Time.time.ToString();

    }

    // Update is called once per frame

    void Update()

    {

        Text mytxt = GameObject.Find("Canvas/Panel/Text (1)").GetComponent<Text>();

        mytxt.text = Time.time.ToString();

    }public void myfun()

    {

        Text mytxt = GameObject.Find("Canvas/Panel/Text (1)").GetComponent<Text>();

        mytxt.text = Time.time.ToString();

        Time.timeScale = 1;

    }

}