Danil posted that the Format property of the DateColumn should use the .NET date format located here: http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx

However, I found that using lower case m "m" or "mm" uses the month instead of the minute as specified in the .NET specification. Using "n" or "nn" does work however...just thought i'd document that as a bug to help anyone that might run into the same problem.