时间戳转化为某时刻

private void SetTime(long _time)

    {

        System.DateTime startTime = System.TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1, 0, 0, 0, 0));

        string month = GetTime(_time.ToString()).Month.ToString() + "-" + GetTime(_time.ToString()).Day.ToString();

        labelTime.text = month + GetTime(_time.ToString()).TimeOfDay.ToString();

    }

    private System.DateTime GetTime(string timeStamp)

    {

        System.DateTime dtStart = System.TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));

        long lTime = long.Parse(timeStamp + "0000000");

        System.TimeSpan toNow = new System.TimeSpan(lTime);

        return dtStart.Add(toNow);

    }