Prestashop date format is YEAR-MONTH-DAY, For several country that date format isnt quite suitable. Like in my country Indonesia, we use DAY-MONTH-YEAR date format.
Heres a quick tips on how to change the default prestashop date format :
1. Open classes/Tools.php. Dont forget to do back up first, incase something happend.
2. Go to lines 314-317.
3. and change the following codes.