The Blog Posts Calendar Widget allows you to display your archived or future posts in a calendar as a sidebar widget.
Monthly grid view calendar widget highlighting archived and/or future posts.
Additional Features:
For more information or to request additional features, please visit the plugin page
Upload the plugin to your ‘wp-content/plugins’ directory, or download and install automatically through your admin panel.
Activate the plugin through the ‘Plugins’ menu in WordPress.
From your admin console, go to Appeareance > Widgets, drag the Blog Post Calendar Widget to wherever you want it to be and click on Save.
See the plugin homepage.
You have total control over your calendar style. Add wp_calendar.css to your theme directory and customize it as you see fit.
First public release March 2013