Devtard

This plugin overrides default date and time of edited posts with dynamically calculated custom values. This is useful especially when scheduling posts; the plugin can, for example, automatically generate new post dates by incrementing the current most future post date by a specified number of days.
Calculated custom date and time will automatically replace default values after clicking the “Edit” link next to “Publish immediately” in the post editor’s Publish module.
<h4>Features</h4>
<ul>
<li>Date/time values usable as a reference: current date/time, oldest or most future post date/time; specific time of day</li>
<li>Date/time of reference can be increased or decreased by a specific number of days/minutes</li>
<li>Configurable post types and statuses of analyzed and affected posts</li>
</ul>
See <a href="https://wordpress.org/plugins/automatic-post-date-filler/screenshots/" rel="ugc">Screenshots</a> for more information.

Automatic Post Date Filler

Automatically sets custom date and time when editing posts.

Kaspars

tetele

This plugin can be used for defining an editorial plan. WP already does a great job with the Scheduled post status, but what if it could be simpler than that?
When publishing posts, the plugin computes the most recent interval when a post can be published and picks a timestamp in that interval when to publish the post. If the selected interval has already passed since the newest post was published and there are no scheduled posts in the queue, then the new post will automatically be published.
The plugin alters the default behavior of WP when publishing posts from the interface or using code (e.g. <code>wp_insert_post()</code>).

Automatic Post Scheduler

A plugin that automatically schedules posts depending on a min/max threshold and the last post's publish date and time.

Automatic Post Date Filler vs Automatic Post Scheduler