I'm using Joomla 2.5 at this time, and would like to see users log-in activities from the beginning of time. The data I would need will be user name and log-in time. How may I get the log-in activity log in Joomla? Are there any extensions available?
It's not a default Joomla feature.
You can find various extensions to do it in the Joomla Extensions Directory under Administration > Admin Reports http://extensions.joomla.org/extensions/administration/admin-reports
One of note, and it's been updated in the past few weeks for Joomla 2.5 and 3.1, is LogMAN by Joomlatools http://www.joomlatools.com/extensions/logman/overview