DateTime.ToString problem

i'm reading in a datetime from a database and then outputting to another text file.
However, the following code appears to display a date incorrect...such as: 18 00 2008
myCurrentLine.Append(((DateTime)this.m_Headers.Rows[this.m_HeadersProcessed + i]["Order Date"]).ToString("dd mm yyyy"));

If i leave it without formatting:
myCurrentLine.Append(((DateTime)this.m_Headers.Rows[this.m_HeadersProcessed + i]["Order Date"]).ToString());
i get the following result: 18/06/2008 00:00:000

What i need to display is just: 18 06 2008

any ideas why its setting the month incorrectly with this code:
myCurrentLine.Append(((DateTime)this.m_Headers.Rows[this.m_HeadersProcessed + i]["Order Date"]).ToString("dd mm yyyy"));Start Free Trial