You can call the formatting methods on the DateTime class
DateTime time = DateTime.ParseExact("Mon, 28 Dec 2009 04:34:17", "ddd, dd MMM yyyy hh:mm:ss", CultureInfo.InvariantCulture);
string output = time.ToString("dd MMM yyyy", CultureInfo.InvariantCulture);
Here is a list of options for the format strings.
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