How to convert one time zone to another with 24 hour format without using the AM and PM . Use only the Timespan.

TimeSpan.TryParse(datewise + ":" + "00", out _timeOfDay);
                var asd = _dt.ToString().Split(new string[] { " " }, StringSplitOptions.None);
                var _newdatetime = asd[0] + " " + _timeOfDay;
                DateTime oldTime = Convert.ToDateTime(_newdatetime);
                TimeZoneInfo timeZone1 = TimeZoneInfo.FindSystemTimeZoneById("AUS Eastern Standard Time");
                TimeZoneInfo timeZone2 = TimeZoneInfo.FindSystemTimeZoneById(TimeZoneInfo.Local.Id);
                DateTime newTime = TimeZoneInfo.ConvertTime(oldTime, timeZone1, timeZone2);
                DateTime new_Time = TimeZoneInfo.ConvertTimeFromUtc(oldTime, timeZone2);
                TimeSpan timeOfDay = new TimeSpan();
                TimeSpan.TryParse(newTime.ToString(), out  timeOfDay);

                new DateTime(newTime.Ticks).ToString("H tt");
                new DateTime(new_Time.Ticks).ToString("H tt");