How to restore date and time back into posts?

Hey,

My site and blog are still shaping up, probably as they always will be. Anyways during the process of shaping the site there was a point when the date and time were removed successfully from posts information (posts were thought to be used as static information pages with category function), but now the site includes a blog, so the date and time information would be more than welcomed back.

After adding several pieces of code, I don’t seem to be able to remember what I’ve exactly deleted to successfully remove date and time from my posts.

So what do I need to do to get date and time back as part of my posts?

https://luonnotar.com/blogi/

Thank you already in advance!