Post date or last modified date

Hello,

I wanted to add a “last modified” information under single posts in my blog, but I would like there to always be a date.

Now it is like: “Last modified on 17 august 2023” when the post has been modified on this date.

But if the post has not been modified yet, it will look like “Last modified on” and no date, which looks quite strange.

Isn’t there a way to show the post date instead of the last modified date as long as the post has never been modified? I think this would fit the needs of users better than just showing nothing.

Thanks!