Hi Kacper,
Thank you for your purchase.

Please provide me a temporary WP-admin login for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course we do not provide login data to third party. You can write credentials here just check Private Reply so nobody can see them except us.

Also point me to the table ID so I can take a look.
Thank you.

Hi Kacper,

Sorry for late response we did not work during holidays. 

Now I see the issue, when you edit or add a new entry in column Data i godzina obchodu it only saves the date and not the time.
Can you please send me phpmyadmin credentials so I can take a look at database and investigate it because I think it is related to that.
You can write credentials here just check PRIVATE reply.

Best regards. 

Hi Kacper,

Can you please try now to add an entry and see if the time is saved.
The issue was in your database. Please take a look at attachment.
Column type for highlighted column was set to date, but I change it now to datetime and it should work now.
Let me know the result.