Each item in that RSS Feed contains a 'PublishDate field which contains a value of Type 'DateTimeOffset.'DateTimeOffset was added to .NET beginning with version 3.5; see: [
^].
Here's an example of parsing the 'PublishDate field:
string url = @"http://www.aparat.com/rss/mesbahsoft";
XmlReader reader = XmlReader.Create(url);
SyndicationFeed feed = SyndicationFeed.Load(reader);
reader.Close();
int count = 1;
foreach (SyndicationItem item in feed.Items)
{
DateTimeOffset publishDate = item.PublishDate;
String subject = item.Title.Text;
String summary = item.Summary.Text;
Console.WriteLine
(
"Item# {0} Title: {1}\nSummary: {2}\nPublish Date-Time: {3} {4} UTC Offset: {5}\n\n",
count.ToString(),
subject,
"summary omitted for testing",
publishDate.Date.ToShortDateString(),
publishDate.DateTime.ToShortTimeString(),
publishDate.Offset.ToString()
);
count++;
}