Set day and month format, but not their order

I know about Datetime formats. "dd" stands for day from 01 to 31, "MM" - the month from 01 through 12. I need this format. But if I write "dd MM"(in my case in ToString() method) it will always put day before the month. How can I set this format(dd and MM) without changing the order(what comes first - day or month) from current locale? So if in current culture day comes first I want to receive "20 08 2012"(separator doesn't matter here), and if month comes first - "08 20 2012"