using System;

 using UnityEngine;

 using System.Collections;

 public class TimeCountdown : MonoBehaviour

 {

     //之前的一个时间点

     public long startTime = ;

     //限定时间秒

     private long fixedTime = ;

     private long nowTime;

     // Use this for initialization

     void Start()

     {

         nowTime = (System.DateTime.Now.Ticks - System.DateTime.Parse("1970-01-01").Ticks) / ;

         if (nowTime - startTime >= fixedTime)

         {

             Debug.Log("倒计时结束");

         }

         else

         {

             InvokeRepeating("CountDown", , );

         }

     }

     // Update is called once per frame

     void Update()

     {

     }

     void CountDown()

     {

         fixedTime -= ;

         gameObject.GetComponent<UILabel>().text = (fixedTime / ( *  * )).ToString() + "天"

              + ((fixedTime/ - fixedTime / ( *  * )**)/).ToString() + "小时"

              + ((fixedTime / ) % ).ToString() + "分"

              + (fixedTime % ).ToString() + "秒";

     }

 }