Change the element order in Event input form?

Hi, I'm using Event module to create event contentห on web site. There have been many topics since it's for an official agency in Thailand, which require the date format to be day/month/year(Bhuddist Era). Thanks to forum topic http://drupal.in.th/node/37 ,and supports from sugree at drupal.in.th , that I can learned how to edit them much better.

One thing I can't change yet is the elements in the create event form. After the 'start date: ' there are
day textfield , year textfield , month selectlist , hour selectlist and minute selectlist.
This doesn't make sense since the date format should be d/m/y which mean that the month input field should come before year field. I've been searching in event.module but can't find any hint yet. This may be because of my lack of php knowledge. If any one know to do it, Please tell me. I will be very appreciated for you help alot.
Thank you