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.

msudvarg

The ‘Future’ plugin allows posts with future scheduled dates to be integrated into a site. This can be useful, for example, with events that have associated dates in the future. Such future posts can, with this plugin, be displayed, both individually and in archive lists. This plugin also adds functionality to the built-in calendar widget. It adds a checkbox to include future posts in the calendar, and it allows the calendar to be configured to show posts from a single category.

Future

Integrates future-dated posts into your blog. Adds future posts and category selection to Wordpress's built-in calendar widget.

Automatic Post Date Filler vs Future