Is there a way (via plugin or hook) to change a post date just before it is published?
Background: We are running a travel blog with daily posts. All posts are scheduled to be published in the future (we only have internet a couple of times a week but want a new post ever day).
So for example I would write about today's (Dec. 19 2013) adventures and set this post to be published on Dec. 26.
Now the post date in Wordpress will be Dec. 26, but I want it to be Dec. 19. while the post should still be published automatically on Dec. 26. Also users are notified by email when a new post is published.
I currently use a custom field to display the "real date" the post is about, but this messes up things like archives and the url scheme of the post that use the post date and not the custom field.