The Action calendar is a module which shows system events in a cronological order. Also known as the Tools Calendar

examples of actions:
creation or edit of a wiki page
upload of a file including date and time, user, and description.

permission tiki_p_view_tiki_calendar.
Activate feature in Admin>Calendar

Once you have the calendar active you can click on a day to see the listing of events for that day. (sorry for the slightly chopped up screenshot)

more info see: Calendar

• Tools Calendars
• Tool Calendar