Unity倒计时

    public Text CountDownTxt;
    DateTime endTime = DateTime.Parse("2020-10-24");
    public float timer = 1f;  //刷新频率
    float time = 0;
    double totalSeconds = 0;
    private void Update()
    {
        if (time<timer)
        {
            time += Time.unscaledDeltaTime;
        }
        else
        {
            time = 0;
            Countdown();
        }
    }
    void Countdown()
    {
        totalSeconds = (endTime - DateTime.Now).TotalSeconds;
        CountDownTxt.text = (totalSeconds / 3600).ToString("D2") + ":" + (totalSeconds % 3600 / 60).ToString("D2") + ":" + (totalSeconds % 60).ToString("D2");
    }