ERROR : Upload matching date

Hello everybody,

I want to upload a csv file and i have a problem with matching date.

First, i imported all my events with date, everything was ok
Now, i need to upload Form that attached to an event.

So i need to have the SAME date format to matching data each other.

But i tried manything date formating on google sheet and still not work …
Currently i have this formating and i don’t know what to try now …

Thanks for your help

CleanShot 2022-02-21 at 19.02.37@2x