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Here’s how to do it. (remember to backup before any modification)

Also change the country code to match yours (this example uses GB for UK)

********************************************************************
* Open catalog/includes/languages/english.php (this is for your catalog section)
* The changes are highlighted.
********************************************************************
@setlocale(LC_TIME, ‘en_GB.ISO_8859-1′);

define(‘DATE_FORMAT_SHORT’, ‘%d/%m/%Y’); // this is used for strftime()
define(‘DATE_FORMAT_LONG’, ‘%A %d %B, %Y’); // this is used for strftime()
define(‘DATE_FORMAT’, ‘d/m/Y’); // this is used for date()
define(‘DATE_TIME_FORMAT’, DATE_FORMAT_SHORT . ‘ %H:%M:%S’);

////
// Return date in raw format
// $date should be in format mm/dd/yyyy
// raw date is in format YYYYMMDD, or DDMMYYYY
function tep_date_raw($date, $reverse = false) {
if ($reverse) {
return substr($date, 0, 2) . substr($date, 3, 2) . substr($date, 6, 4);
} else {
return substr($date, 6, 4) . substr($date, 3, 2) . substr($date, 0, 2);
}
}

*********************
Also change the following
*********************

CODE
define(‘ENTRY_DATE_OF_BIRTH_ERROR’, ‘Your Date of Birth must be in this format: MM/DD/YYYY (eg 05/21/1970)’);
to
CODE
define(‘ENTRY_DATE_OF_BIRTH_ERROR’, ‘Your Date of Birth must be in this format: DD/MM/YYYY (eg 21/05/1970)’);

CODE
define(‘ENTRY_DATE_OF_BIRTH_TEXT’, ‘* (eg. 05/21/1970)’);
to
CODE
define(‘ENTRY_DATE_OF_BIRTH_TEXT’, ‘* (eg. 21/05/1970)’);

CODE
define(‘DOB_FORMAT_STRING’, ‘mm/dd/yyyy’);
to
CODE
define(‘DOB_FORMAT_STRING’, ‘dd/mm/yyyy’);