DateTime.ParseExact, Ignore the timezone

If I have a date such as 2011-05-05T11:35:47.743-04:00

How can I ignore the timezone (-04:00) when I do a DateT开发者_C百科ime.ParseExact programatically?

DateTimeOffset dt =DateTimeOffset.Parse("2011-05-05T11:35:47.743-04:00", null);