A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
I believe you mean that the dates as in NOTE 1 are in dd.mm.yyyy format.
Select eh entire column with these dates and on the Data ribbon select Text to columns. Click through to step 3 (don't change anything). Now select the data format for the column as Date, specifying it is in DMY format.
Finish! Now all dates should have transformed into dates recognized by your local set-up.