We are currently working on a new brand functionality as part of the Content Releases feature. It will enable to schedule a release to a specific publication date.
Original post:
Allow users to easily edit the
field with a simple date picker field in admin. Allow users to edit and update this like any other field. Unless I'm missing something this currently requires customization. There are plugins like https://market.strapi.io/plugins/strapi-plugin-publisher but these are related to scheduling rather than simply managing an existing publish date. I imagine most users expect the simple ability to manage publish date (or would utilize it) as a standard feature.
A simple example would be to back date a blog post. Below is a screenshot of this feature in WordPress.