Grab an offset in seconds from a UTC timecode on a Unified Streaming Server. Takes it to account encoder reconnects / restarts. This is the C# version.

OffsetFromTimecode.cs

public double GetOffsetFromTimecode(Guid eventId, DateTime startPos, DateTime inPoint)
        {
            startPos = startPos.ToUniversalTime();
            inPoint = inPoint.ToUniversalTime();

            var ismUrl = _configuration.GenerateIsmStreamUrl(eventId);
            var streamUrl = ismUrl + "/archive";

            var doc = XDocument.Load(streamUrl);
            var videoEl = doc.Descendants().First(x => x.Name.LocalName == "video");
            var cEls = videoEl.Descendants().Where(x => x.Name.LocalName == "c");
            var finalCEls = new List();
            var totalSeconds = TimeSpan.FromSeconds(0);

            foreach(var cEl in cEls)
            {
                var endOfC = DateTime.Parse(cEl.Attribute("end").Value).ToUniversalTime();
                if(endOfC > inPoint)
                {
                    finalCEls.Add(cEl);
                }
            }

            foreach(var cEl in finalCEls)
            {
                var startOfC = DateTime.Parse(cEl.Attribute("start").Value).ToUniversalTime();
                var endOfC = DateTime.Parse(cEl.Attribute("end").Value).ToUniversalTime();

                //override start if they fall into middle part
                if (inPoint >= startOfC && inPoint <= endOfC)
                {
                    startOfC = inPoint;
                }

                if (startPos < endOfC)
                {
                    if (startPos < startOfC) break;
                    totalSeconds += (startPos.TimeOfDay - startOfC.TimeOfDay);
                }
                else
                {
                    totalSeconds += (endOfC.TimeOfDay - startOfC.TimeOfDay);
                }
            }

            return totalSeconds.TotalSeconds;
        }
    }