A small module that will display a small calendar, and dates will show a page of content items posted on that day. You will need the Component part of this as well.

  Joomla! Calendar Module (7.3 KiB, 2,408 Downloads)

A small module that will display a small calendar, and dates will show a page of content items posted on that day. You will need the Module part of this as well.

  Joomla! Calendar Component (41.4 KiB, 2,031 Downloads)