MissionPlanner.Georefimage.getPhotoTime C# (CSharp) Method

        DateTime getPhotoTime(string fn)
        {
            DateTime dtaken = DateTime.MinValue;

            if (filedatecache.ContainsKey(fn))
            {
                return (DateTime)filedatecache[fn];
            }

            try
            {
                
                Metadata lcMetadata = null;
                try
                {
                    FileInfo lcImgFile = new FileInfo(fn);
                    // Loading all meta data
                    if (fn.ToLower().EndsWith(".jpg"))
                    {
                        lcMetadata = JpegMetadataReader.ReadMetadata(lcImgFile);
                    }
                    else if (fn.ToLower().EndsWith(".tif"))
                    {
                        lcMetadata = TiffMetadataReader.ReadMetadata(lcImgFile);
                    }
                }
                catch (JpegProcessingException e)
                {
                    log.InfoFormat(e.Message);
                    return dtaken;
                }
                catch (TiffProcessingException e)
                {
                    log.InfoFormat(e.Message);
                    return dtaken;
                }

                foreach (AbstractDirectory lcDirectory in lcMetadata)
                {

                    if (lcDirectory.ContainsTag(0x9003))
                    {
                        dtaken = lcDirectory.GetDate(0x9003);
                        log.InfoFormat("does " + lcDirectory.GetTagName(0x9003) + " " + dtaken);

                        filedatecache[fn] = dtaken;

                        break;
                    }

                    if (lcDirectory.ContainsTag(0x9004))
                    {
                        dtaken = lcDirectory.GetDate(0x9004);
                        log.InfoFormat("does " + lcDirectory.GetTagName(0x9004) + " " + dtaken);

                        filedatecache[fn] = dtaken;

                        break;
                    }

                }


                


                ////// old method, works, just slow
                /*
                Image myImage = Image.FromFile(fn);
                PropertyItem propItem = myImage.GetPropertyItem(36867); // 36867  // 306

                //Convert date taken metadata to a DateTime object 
                string sdate = Encoding.UTF8.GetString(propItem.Value).Trim();
                string secondhalf = sdate.Substring(sdate.IndexOf(" "), (sdate.Length - sdate.IndexOf(" ")));
                string firsthalf = sdate.Substring(0, 10);
                firsthalf = firsthalf.Replace(":", "-");
                sdate = firsthalf + secondhalf;
                dtaken = DateTime.Parse(sdate);

                myImage.Dispose();
                 */
            }
            catch { }

            return dtaken;
        }