Users still can add items in the category very well but it is an error when we want to view items category. We get this error.

DateTime::__construct(): Failed to parse time string (10.30.2011) at position 8 (1): Unexpected characterAn error has occurred while processing your request.You may not be able to visit this page because of:

• an out-of-date bookmark/favourite
• a mistyped address
• a search engine that has an out-of-date listing for this site
• you have no access to this page

thank

Hello Fotis, 
I contacted with Joomla forum and they don’t know the really problem also.
Now I just try to disable plugins and K2 Items. Now I just know the problem is with Extra Fields of Date when I disable it, my website working perfect.

And my client need this field so I can’t disable it to make the whole website working because they insert many data already.

Do you have any ideas to help me Fotis..?

Here is the video 
www.dropbox.com/s/9k0eiugn6igi2q1/date_of_birth.mov?dl=0

My detail PHP version7.4.15Database version5.7.33  K2 v2.10.4 [Dev Build 20210205]

Thank you for your respond
I never download  any translations from the link you showed me. And this version   K2 v2.10.4 [Dev Build 20210205]  was from you. You sent to me.
 

I am using this plugin Multiple Categories for K2 – Joomla! plugin is it a problem or not? I disable it and run the page again but I still see the error
DateTime::__construct(): Failed to parse time string (10.30.2011) at position 8
thank