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 = 1379342120;
    //限定时间秒
    private long fixedTime = 200000;
    private long nowTime;




    // Use this for initialization
    void Start()
    {
        nowTime = (System.DateTime.Now.Ticks - System.DateTime.Parse("1970-01-01").Ticks) / 10000000;
        if (nowTime - startTime >= fixedTime)
        {
            Debug.Log("倒计时结束");
        }
        else
        {
            InvokeRepeating("CountDown", 0, 1);
        }
    }

    // Update is called once per frame
    void Update()
    {

    }

    void CountDown()
    {
        fixedTime -= 1;
        gameObject.GetComponent<UILabel>().text = (fixedTime / (60 * 60 * 24)).ToString() + "天"
             + ((fixedTime/60 - fixedTime / (60 * 60 * 24)*24*60)/60).ToString() + "小时"
             + ((fixedTime / 60) % 60).ToString() + "分"
             + (fixedTime % 60).ToString() + "秒";
    }
}