Sorry about that. I created a view with 2 columns, one with the pre-defined simple function "Creation Date" and one with the field value of the form (@Created).
In some cases, the column with the pre-defined simple function shows the exact creation date of the document e.g. 29/7/2003, and on the contrary, the other column (field value) shows a total irrelevant date e.g. 21/6/2003.
In other cases, its the opposite, the column with the field value shows the exact creation date and the pre-defined one an irrelevant date.
From 2000 docs, only 50 the two column values match, show the same date, the exact creation date.