For example : if you have a date dd/MM/yyyy. follow the steps
1. Edit the table
2. Split the column with '/' custom delimiter
3. Re-arrange the columns to see the month in first and date column to next and year to the last.
4. Select all the three columns.
5. Right click-> Merge columns with a custom delimiter '/'.
6. Transform the column to change the data type to 'Date'
Finally you see the column transformed. Its easy. Try it by yourself.