A client recently rang me concerned that all her MYOB dates were in American format. Here is the typical way I would resolve this issue;

CLICK on start at the bottom left hand side of your screen.

A pop up screen should appear, and then CLICK on Control Panel.

SELECT the icon that looks like a small globe Regional and Language Options.

Ensure that you have selected English (Australia) or whatever your preference is, and CLICK on the Apply button at the bottom of your screen.

This should resolve your issues, and convert any American date formats (Month / Day/ Year) in MYOB, to an Australian date formats (Day/Month/Year)

from Heather Smith ~ MYOB Certified Consultant