BuddyPress.org

Here is my temporal solution:

add_action( 'bp_activity_before_save', "ftblg_bp_timezone_bug" );

function ftblg_bp_timezone_bug($activity) {

$blog_time_offset=get_option('gmt_offset') * 3600;

$server_time_offset=-6 * 3600;

$activity->date_recorded = $activity->date_recorded - $blog_time_offset;

$activity->date_recorded = $activity->date_recorded + $server_time_offset;

}

change ‘-6’ for the server time zone.