Unity PlayerPrefs记录时间

    static public void SaveDateTimeInPlayerPrefs(string key, DateTime dt)
    {
        string timeStr = dt.ToString("yyyy-MM-dd HH:mm:ss");
        PlayerPrefs.SetString(key, timeStr);
    }

    static DateTime  GetDateTimeInPlayerPrefs(string key)
    {

        if (!PlayerPrefs.HasKey(key))
            return DateTime.Now;
        string value = PlayerPrefs.GetString(key);
        return Convert.ToDateTime(value);

    }