hello Justin,
Unfortunately we do not have setting for configure the date time format in current system.
But you can modify this 2 file :
JoomlaFolder\media\com_easysocial\apps\group\discussions\themes\default\streams\create.content.php (Group Discussion)
// LINE 36
<i class="ies-calendar"></i> <?php echo JText::sprintf( 'APP_GROUP_DISCUSSIONS_CONTENT_POSTED_ON_META' , FD::date( $discussion->created )->format(JText::_('DATE_FORMAT_LC'))); ?>
===================================================================================================
JoomlaFolder\media\com_easysocial\apps\group\news\themes\default\streams\create.content.php (Group Announcement )
//LINE 20
<i class="ies-calendar"></i> <?php echo JText::sprintf( 'APP_GROUP_NEWS_STREAM_META_CREATED_ON' , FD::date( $news->created )->format( JText::_( 'DATE_FORMAT_LC' ) ) ); ?>
//You can replace the Joomla existing format to
//Example : JoomlaFolder\goodjob32.com\language\en-GB\en-GB.ini
DATE_FORMAT_LC="l, d F Y"
DATE_FORMAT_LC1="l, d F Y"
DATE_FORMAT_LC2="l, d F Y H:i"
DATE_FORMAT_LC3="d F Y"
DATE_FORMAT_LC4="Y-m-d"
DATE_FORMAT_JS1="y-m-d"
Hope this help.