Show "updated date" instead of creation date

Hi there,

thank you for the amazing theme. It looks beautiful and works well!
I just started with my own website and blog.

Summary

Is there a way to display the "Last updated" date instead of the creation date on the start-page, atom-page and blog-page?

Motivation

I want to add new things to my posts over time. If its just an addition to an existing topic I don't want to create a new blog post.
Right now the change is only visible to a website visitor if he opens the post and sees the "Last updated".