The platform's default date format is European:  Day then Month then Year

Programs likes Excel rely on the computers Language, Region and Date format settings (at the operating system level). 

For example in Windows you can set the language to be English (US) or English (UK). 

Setting the date as English (UK) ensures that Excel will show the date format in European format. 

If the date in a downloaded excel sheet from the platform is showing the date in the American format - please check the system settings are correct.