Add the ability to specify a date for the "Add New" post form

[zgrossbart]

I'm working on a plugin to add an editorial calendar to WordPress. You can see it at ​http://www.zackgrossbart.com/extras/sandbox/wp-admin.

I would like to add an "Add New Post To This Date" link. Ideally this link would look like this:

/wp-admin/post-new.php?date=(some date)

This would lead to the add post page with the date already set to (some date). I could work around this by inserting a new draft post on the specified day, but then the user would have to delete the draft if they changed their mind.

[Denis-de-Bernardy]

#8223