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.

Ryan

Aelora

Make it easier on yourself to schedule future posts.
Auto Future Date allows you to quickly and easily schedule posts based on the 
last post on your site. A simple click on a link and your post will be scheduled 
for a future date based on a set of simple rules that you set up.
I use this on a blog of mine where I write several posts at a time and want to 
spread them out rather than publishing them all at the same time. Future posts 
are great for this, but I found myself going back and forth to the calendar 
to schedule.
When activated the plugin adds an “Auto” link right next to the link that you 
use to schedule a future post. Clicking on the Auto link makes an Ajax call that 
will set the date for your post at some point in the future, using rules that you 
set.
More information at <a href="http://www.nutt.net/tag/auto-future-date/" rel="nofollow ugc">Nutt.net</a>

Auto Future Date

Adds an "Auto" link to your post page that will automatically schedule your next post based on the most recent post.

Automatic Post Date Filler vs Auto Future Date