Erros in https://validator.w3.org

Hi!
I'm trying to fix html errors on my site.
HTML validator found many errors in Komento:

http://monosnap.com/image/9L5Bs8iTQim7eRHcIxkI460GIDli9L.png

Can I remove those attributes from templates?
parentid=
childs=
published=

Those attributes not allowed on elements <li>

Also, validator displays this error:

Error: Bad value -001-11-30T00:00:00+00:00 for attribute datetime on element time: The literal did not satisfy the time-datetime format.

How to fix it?

Thanks.