SaleMaker and UK-style dates

Zen Cart, by default, uses the US system of dates - mm/dd/yyyy. In the UK we use a different format - dd/mm/yyyy. Within admin/includes/languages/english.php I can change the format for dates so that they display correctly within the admin panel, but if I do that it breaks the date function for SaleMaker.

For example, if I enter 27/01/2008 as a start date for a sale, when I click update that date becomes 30/11/2036. If I remove my edits from english.php, then the entered date of 01/27/2008 stays as 01/27/2008.

I'd rather have the dates in the correct format for the UK so any advice anyone can offer would be gratefully received.

Update: Just discovered that with my edits in place, when in SaleMaker if I type the date in US format rather than use the date selection popups then it will put the date in UK format when saved. This is a bit anti-intuitive though so I'm still looking for a solution.

OK, found the answer: http://www.zen-cart.com/wiki/index.php/Date_Format