timlinden

Remembering to post every day, and which days you already posted, is super easy with this plugin. 
It shows you a calendar with days red when there isn’t a post, and days green when there is. Green 
days you can hover over and see the title of the post, and click to edit the post for that day.

wpFutureCal

A simple calendar that displays when you edit posts, showing which days you have posted on.

Andrew Nacin

shacker

xjlin0

rboren

A WordPress plugin aimed primarily at events sites, where you want to be able to timestamp posts in the future but have them appear immediately (by default, WordPress will not display a future timestamped post until its go-live date rolls around). Without changing database, this plugin sets the post_status field to “publish” rather than “future” when publishing a post, even if its timestamp is in the future.
Note: This 2.0 version requires WordPress 3.5 or higher. If you need this to work with versions lower than 3.5, grab the 1.0 version from svn: https://plugins.svn.wordpress.org/the-future-is-now/tags/1.0/
<h3>Note</h3>
This seemingly simple plugin was graciously written by the magical Ryan Boren when I was facing a deadline. He doesn’t have time to maintain/host it, so I agreed to. Andrew Nacin tweaked it to work with WP 3.5, when the APIs changed a bit. Jack updated the plugin for WordPress 6.8.

The Future Is Now

Allow future-time-stamped posts to appear live on your site immediately.

wpFutureCal vs The Future Is Now