Date format nightmare

solved with this:

Because it is not a date to excel.

1. Select the column in which there was date
2. Goto data and choose text to column
3. choose delimited and click next
4. uncheck all and click next
5. click on date and choose right data format of the date that you currently have. It seems that you have DMY, Chose that and finish

This will transform the cells to date

Now format the date as you wish