// All operations must be performed on the UTC value and then converted back to local
// time - see http://msdn.microsoft.com/library/en-us/dndotnet/html/datetimecode.asp
public DateTime AddYears(int years)
{
DateTime result = new DateTime(Universal.AddYears(years), m_nanosecond, Type.TimeZone.UTC, true);
return(result.ToTimeZone(TimeZone));
}