iorbita
Hi,
I checked your site and saw that date is a custom field you added for the article. This custom field has type of 'Calendar'.
This calendar field uses the constant DATE_FORMAT_LC4 for date and DATE_FORMAT_LC5 for date & time by default in Joomla.
So I go to the language overrides and edit the values for this constant: DATE_FORMAT_LC4 to d-m-Y (screenshot) and it's showing fine now on your site
For more value for PHP date function, you can check out here: http://php.net/manual/en/function.date.php