Unrecognized date format in custom fields during import of contributions

I had to import contributions from a CSV file, and I configured some custom fields for contributions, whose one is a check date whose the format is Date (this is different from the Received payment date).

During the import, some dates were not recognized because my file has dd/mm/yyyy dates and CiviCRM expected mm/dd/yyyy dates (problem with e.g. 16/03/2010), despite the fact I correctly selected dd/mm/yyyy on the first step of the import process.

On the third step of the import process I had no error (=dates were recognized), but the errors came only the the fourth step (actual import). When I verified the imported contributions, months and days were exchanged (2 April becames 4 February).