Make Image Capture Date the Post Publish Date

Hello!

Does anyone know a way to make the publish date of a post automatically match the capture date of a photo?

Here's why:

I created a basic site for my family to view photos of the kid. It's completely password protected with TML. When I post a new image, I'd like for the 'publish' date of the post to match the date the photo was taken. This will make the posts show in chronological order when they were image was taken and not when the post was created.

I often create the posts from the Wordpress app (if this makes any difference).

Thank you!