Persistent error converting to UTC

                            //DateTime toDiff = DateTime.SpecifyKind(DateTime.Today.Add((TimeSpan)Input.To), DateTimeKind.Local);
                            //DateTime toDiff = DateTime.UtcNow.Date.Add((TimeSpan)Input.To);
                            DateTime toDiff = DateTime.UtcNow;
                            DateTime toDiffConverted = Time.ConvertToUtc(toDiff, Input.TimeZone);
                            TimeSpan toCalc = toDiffConverted.TimeOfDay;
                            _company.To = toCalc;

     internal static DateTime ConvertToUtc(DateTime time, string userTimezone)
        {
            var timeZonesList = TimeZoneInfo.GetSystemTimeZones();
            var it = timeZonesList.Where(a => a.Id.Equals(userTimezone)).FirstOrDefault();
            return TimeZoneInfo.ConvertTimeToUtc(time, TimeZoneInfo.GetSystemTimeZones().Where(a => a.Id.Equals(userTimezone)).FirstOrDefault());
        }