hijiri

Allows to you to set the datetime of expiration and the schedule which overwrites the another post.
Datetime of Expiration
When it becomes the datetime of expiration, the status of post is changed to ‘draft’.
Overwrite the another post
When the scheduled post(A) is published by wp cron, the new post(A) overwrite the another post(B) and the old post(B) is changed to draft. 
The slug of the new post(A) is changed to the slug of the old post(B). 
The slug of the old post(B) is changed to the slug of the new post(A).
This Plugin published on <a href="https://github.com/hijiriworld/advanced-schedule-posts" rel="nofollow ugc">GitHub.</a>

Advanced Schedule Posts

Advanced Schedule Posts plugin allows to you to set the datetime of expiration and the schedule which overwrites the another post.

jwpegram

Schedule Random Post Time adds a button to the post, page and comments that adds a button allowing you to generate a random date. This plugin is useful for us lazy people that would rather not take the time trying to decide what date and time in the future to schedule a post for. Simply click the button and let it decide for you.
rDate button will be diplayed:
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<li>
When editing the date and time on a Post
</li>
<li>
When editing the date and time on a Page
</li>
<li>
When editing the date and time on a Comment
</li>
<li>
When quick editing a Post
</li>
<li>
When quick editing a Page
</li>
</ul>

Schedule Random Date/Time Button

Adds a Random Date button when editing a Post, Page or Comment.

Advanced Schedule Posts vs Schedule Random Date/Time Button