project 3 case study 2

i have problem with csv formate data... the format of dd-mm-yyyy hh:mm is different for few its dd/mm/yyyy hh:mm even after editing doing changes its showing samething no change in csv file and in out put it is showing differnt output idk how to solve it,,, help me out csv file to xlxs and csv still noo change...online editer are also not working