Unity3D 简单的倒计时

 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";
     }
 }