Peter

Display a countdown of important dates. A real-time JavaScript version is also available. The plugin can be used as widget if needed. See the plugin page at http://www.theblog.ca/date-countdown for full information.

Peter’s Date Countdown

Display a countdown of important dates. A real-time version is also available.

David Walsh

kamontander

Simple Shortcode Calendar lets you add an HTML-table-based monthly calendar to your posts and pages by entering a shortcode.
Features
<ul>
<li>Defaults to current month.</li>
<li>Choose any year+month combination.</li>
<li>Choose the first day of the week (Monday, Sunday or Saturday).</li>
<li>Enter custom names for months and days (for localization purposes).</li>
<li>Highlight important dates.</li>
</ul>
This plugin is based on a <a href="http://davidwalsh.name/php-calendar" rel="nofollow ugc">tutorial for building a calendar using PHP, XHTML, and CSS</a> by David Walsh.

Simple Shortcode Calendar

Once installed you have no settings, no options, and you don't even get a message telling you what the shortcode is, could be much much better.



Poor

Lets you create a monthly calendar by entering a shortcode. Calendar is output as an HTML table. You can also highlight certain dates.

Peter’s Date Countdown vs Simple Shortcode Calendar