Hi MarthinusVZ,
Excel set the format of date based on your system setting, one way to make Excel show the different date format like this: yyyy-mm-dd, you could change your system setting:
1,In the search box on the taskbar, type control panel, and then select Control Panel.
2,Under Clock, Language and Region, click Change date, time, or number formats
3,Click Regional and Language Options.
4,In the Region dialog box, click Additional settings.
5,Click the Date tab.
6,Set the format to meet your needs.
7,Click OK.
Then when you open the CSV file with date information, you will see a Text import Wizard to let your choose the date format.
Then you shall have the date in the format you want:
If you do not like to change system setting, you could open the CSV file with Excel and change the format in Excel,
Select the date figure > Number Format > More Number Formats > select the format > OK
If you still save the file as CSV, this process needs to be done every time you open the file.
Regards,
Alex