There is a weird behavior ( BUG ? ) when exporting DATES to Excel in a machine with Portuguese Language and date format as dd/mm/yyyy.
1- If the DAY of a exported date is less than 12, cells in Excel are exported as date but having mm/dd/yyyy as format.
2- If the DAY of a exported date is greather then 12, cells in Excel are exported as GENERAL format as "dd/mm/yyyy ".
Changing the machine configuration to American English and date format to mm/dd/yyyy the exported dates are always in dd/mm/yyyy, but still days until 12 exported as dates and greather then 12 as GENERAL format.
I've tried dd-mm-yyyy format and the behavior was the same.
Please let me know if I can help in any way.