Hi there, @alex3253x… if you look at the issue checker, I’m sure it is telling you about a type mismatch (like what Adam described to you here), and the reason for the mismatch is because when you format a date, you turn it into a text value. So, you are trying to save a text value to a date field, and you can’t do that because the types don’t match.
Simply save the date without trying to format it and then format the date any way you’d like when you display it on the front end, and you should be good to go.
Hope this helps.
Best…
Mike