Fromatting date within an expression

hi all!

I have written a report which uses an expression to combine a couple of fields and some text in one sentence. the issue that I have is that when I combine texts and fields I don't have the ability to format the date so it comes out in a format that doesn't work for us in Australia.

Can someone tell me an easy way (I'm a beginner) to change the format of the date when it is within an expression?

This is the text i want "Raised by Allana Smith on 16 October 2013" and this is the expression I'm using.

="Raised by " & Fields!Raised_By.Value & " on " & Fields!Initiation_Date.Value

and it comes out like this "Raised by Allana Smith on 2/21/2013"

Thanks :)

Allana