From "dd/MM/yyyy" to "yyyy-MM-dd": s/^(\d+)-(\d+)-(\d+)$/$3-$2-$1/

    id | date                  id | num
    ---|-----------            ---|-----------
     1 | 14-01-2003             1 | 2003-01-14
    ---|-----------            ---|-----------
     2 | 28-07-2004             2 | 2004-07-28
    ---|-----------            ---|-----------
     3 | 08-11-2005             3 | 2005-11-08