UBB.threads PHP Forum Software Community Forums Resources and Customizing How Do I? Change Default Time Format: to UK Format

I'm trying to change the date from 13/11/28 to 28/11/13. I've tried to put php code in. I've tried to search this forum no end but I simply cannot find a topic which answers this question.

Can someone type out the code I need to put in to set this to the format I need?