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这一篇主要详细介绍时分秒 ，day，week，month获取，以及相互转换。

获取当前时间

    public static DateTime GetCurrentDateTime()
    {
        return DateTime.Now;
    }

当前UTC时间

public static double GetCurUtcTimeInSeconds () {
        TimeSpan span = DateTime.UtcNow.Subtract (new DateTime (1970, 1, 1, 0, 0, 0));
        return span.TotalSeconds;
    }
    
    public static double GetCurrentTimeInSeconds () {
        TimeSpan span = DateTime.Now.Subtract (new DateTime (1970, 1, 1, 0, 0, 0));
        return span.TotalSeconds;
    }

返回的TimeSpan，可以获得当前的时分秒之和，日周月年之和

通过获取服务器时间，获得DayOfWeek

public static int GetDayOfWeek()
    {
        var data = new DateTime(1970,1,1,0,0,0);
        var ret = data.AddSeconds(GetServerTime());
        var index = -1;
        switch (ret.DayOfWeek.ToString())
        {
            case "Monday": index = 1; break;
            case "Tuesday": index = 2; break;
            case "Wednesday": index = 3; break;
            case "Thursday": index = 4; break;
            case "Friday": index = 5; break;
            case "Saturday": index = 6; break;
            case "Sunday": index = 7; break;
        }
        return index;
    }

传入TotalSecond，获取时分秒的String

/// <summary>
    /// 计算时分秒
    /// </summary>
    /// <param name="time">总共多少秒</param>
    /// <returns>返回格式 HH:MM:SS</returns>
    public static string GetTimeString(float time)
    {
        string hour;
        string minutes;
        string seconds;
        string timeStr="";
        float h = Mathf.FloorToInt(time / 3600f);
        if (h<=0)
        {
            
        }else if (h<10)
        {
            hour = h.ToString("00");
            timeStr += hour + ":";
        }
        else
        {
            hour = h.ToString("00");
            timeStr += hour + ":";
        }

        float m = Mathf.FloorToInt(time / 60f - h * 60f);
        if (m<0)
        {
            
        }else if (m<10)
        {
            minutes = m.ToString("00");
            timeStr += minutes + ":";
        }
        else
        {
            minutes = m.ToString("00");
            timeStr += minutes + ":";
        }
        float s = Mathf.FloorToInt(time - m * 60f - h * 3600f);
        if (s<0)
        {
            
        }else if (s<10)
        {
            seconds = s.ToString("00");
            timeStr += seconds;
        }
        else
        {
            seconds = s.ToString("00");
            timeStr += seconds;
        }
        return   timeStr;
    }

处理倒计时问题，比如现在距离第二天早上6点倒计时处理

public static string getNowToNextDay6AM ()
    {
        var time = "";
        var next = new DateTime(DateTime.Now.Year,DateTime.Now.Month,DateTime.Now.Day + 1,6,0,0);
        var TotalSeconds = (next - DateTime.Now).TotalSeconds;
        var hour = (int) (TotalSeconds / 60 / 60);
        var minute = (int) (TotalSeconds / 60 % 60);
        var second = (int) (TotalSeconds % 60);
        time = Get2Str(hour) + ":" + Get2Str(minute) + ":" + Get2Str(second);
        return time;
    }

先记录到这里，之后有更好的方法，在此更新。