Problems with date field in migration from d6 to d8

Hello. On the d6 site i have a content type with two date field (d6 date module).
All the nodes where at least one of the date fields are not empty, are not beeing migrated.
Not just the field but the whole node.
In the upgrade log, i have error messages like this one:
ID sorgente 4148: Format date plugin could not transform "1965-00-00T00:00:00" using the format "Y-m-dTH:i:s". Error: The created date does not match the input value.

In the d6 db, date values looks like this:

+------+--------------------------------------+---------------------------+
| nid  | field_libro_data_pubblicazione_value | field_data_prestito_value |
+------+--------------------------------------+---------------------------+
| 413 8| 1966-00-00T00:00:00                  | 2012-03-12T23:00:00       |
+------+--------------------------------------+---------------------------+

Can i solve this by editing the date format in the d6 db? Every suggestion is appreciated, thank you.

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/37/feed