DateTimeOffset format: u
using System; using System.Globalization; using System.Threading; public class Example { public static void Main() { DateTimeOffset outputDate = new DateTimeOffset(2010, 5, 31, 21, 0, 0, new TimeSpan(-8, 0, 0)); string specifier; specifier = "u"; // Displays u: 2007-11-01 05:00:00Z Console.WriteLine("{0}: {1}", specifier, outputDate.ToString(specifier)); } } //u: 2010-06-01 05:00:00Z