@RonnieSilva
If your dates are in same column(s) you may use Text to Columns to them applying proper date format on third step of the wizard. That works column by column. If you have few, better not to open csv but import it into blank file, same conversion could be applied to all columns with dates.
If dates are placed randomly with the file, when change locale setting temporary (Win+R, control international, short date format) and return it back after file conversion.