diff --git a/components/ILIAS/Chatroom/classes/class.ilChatroomFormFactory.php b/components/ILIAS/Chatroom/classes/class.ilChatroomFormFactory.php
index 49fa8b4f7960..f030b027d7b2 100755
--- a/components/ILIAS/Chatroom/classes/class.ilChatroomFormFactory.php
+++ b/components/ILIAS/Chatroom/classes/class.ilChatroomFormFactory.php
@@ -263,33 +263,6 @@ public function getUserChatNameSelectionForm(array $name_options): ilPropertyFor
         return $form;
     }
 
-    /**
-     * Returns session form with period set by given $sessions.
-     */
-    public function getSessionForm(array $sessions): ilPropertyFormGUI
-    {
-        $form = new ilPropertyFormGUI();
-        $form->setPreventDoubleSubmission(false);
-        $list = new ilSelectInputGUI($this->lng->txt('session'), 'session');
-
-        $options = [];
-
-        foreach ($sessions as $session) {
-            $start = new ilDateTime($session['connected'], IL_CAL_UNIX);
-            $end = new ilDateTime($session['disconnected'], IL_CAL_UNIX);
-
-            $options[$session['connected'] . ',' .
-            $session['disconnected']] = ilDatePresentation::formatPeriod($start, $end);
-        }
-
-        $list->setOptions($options);
-        $list->setRequired(true);
-
-        $form->addItem($list);
-
-        return $form;
-    }
-
     public function getClientSettingsForm(): ilPropertyFormGUI
     {
         $form = new ilPropertyFormGUI();
diff --git a/components/ILIAS/Chatroom/classes/class.ilChatroomTabGUIFactory.php b/components/ILIAS/Chatroom/classes/class.ilChatroomTabGUIFactory.php
index 5edf056c3a95..17cf1e7bfae7 100755
--- a/components/ILIAS/Chatroom/classes/class.ilChatroomTabGUIFactory.php
+++ b/components/ILIAS/Chatroom/classes/class.ilChatroomTabGUIFactory.php
@@ -302,18 +302,6 @@ public function getTabsForCommand(string $command): void
                 'link' => $DIC->ctrl()->getLinkTarget($this->gui, 'history-byday'),
                 'permission' => 'read',
                 'enabled' => $room ? $room->getSetting('enable_history') : false,
-                'subtabs' => [
-                    'byday' => [
-                        'lng' => 'history_by_day',
-                        'link' => $DIC->ctrl()->getLinkTarget($this->gui, 'history-byday'),
-                        'permission' => 'read'
-                    ],
-                    'bysession' => [
-                        'lng' => 'history_by_session',
-                        'link' => $DIC->ctrl()->getLinkTarget($this->gui, 'history-bysession'),
-                        'permission' => 'read'
-                    ]
-                ]
             ],
             'info' => [
                 'lng' => 'info_short',
diff --git a/components/ILIAS/Chatroom/classes/gui/class.ilChatroomHistoryGUI.php b/components/ILIAS/Chatroom/classes/gui/class.ilChatroomHistoryGUI.php
index 0a2640755ba1..c6b575d9506a 100755
--- a/components/ILIAS/Chatroom/classes/gui/class.ilChatroomHistoryGUI.php
+++ b/components/ILIAS/Chatroom/classes/gui/class.ilChatroomHistoryGUI.php
@@ -18,13 +18,6 @@
 
 declare(strict_types=1);
 
-/**
- * Class ilChatroom
- * Keeps methods to prepare and display the history task.
- * @author  Jan Posselt <jposselt@databay.de>
- * @version $Id$
- * @ingroup components\ILIASChatroom
- */
 class ilChatroomHistoryGUI extends ilChatroomGUIHandler
 {
     /**
@@ -100,6 +93,7 @@ public function byDay(bool $export = false): void
 
         if ($submit_request) {
             if ($durationForm->checkInput()) {
+                /** @var ilDateDurationInputGUI $period */
                 $period = $durationForm->getItemByPostVar('timeperiod');
 
                 $messages = $room->getHistory(
@@ -218,67 +212,6 @@ private function showMessages(
         $this->mainTpl->setVariable('ADM_CONTENT', $roomTpl->get());
     }
 
-    public function bySessionExport(): void
-    {
-        $this->tabs->activateSubTab('bysession');
-        $this->bySession(true);
-    }
-
-    public function bySession(bool $export = false): void
-    {
-        $room = ilChatroom::byObjectId($this->gui->getObject()->getId());
-        $this->exitIfNoRoomExists($room);
-
-        $scope = $room->getRoomId();
-
-        $chat_user = new ilChatroomUser($this->ilUser, $room);
-
-        $formFactory = new ilChatroomFormFactory();
-        $durationForm = $formFactory->getSessionForm($room->getSessions($chat_user));
-        $durationForm->setTitle($this->ilLng->txt('history_bysession_title'));
-        $durationForm->addCommandButton('history-bySessionExport', $this->ilLng->txt('export'));
-        $durationForm->addCommandButton('history-bySession', $this->ilLng->txt('show'));
-        $durationForm->setFormAction(
-            $this->ilCtrl->getFormAction($this->gui, 'history-bySession')
-        );
-
-        if (strtolower($this->http->request()->getServerParams()['REQUEST_METHOD']) === 'post') {
-            $session = $this->getRequestValue('session', $this->refinery->kindlyTo()->string());
-            $durationForm->checkInput();
-            $postVals = explode(',', (string) $session);
-            $durationForm->setValuesByArray([
-                'session' => $session
-            ]);
-
-            $messages = $room->getHistory(
-                $from = new ilDateTime($postVals[0], IL_CAL_UNIX),
-                $to = new ilDateTime($postVals[1], IL_CAL_UNIX),
-                $chat_user->getUserId()
-            );
-        } else {
-            $last_session = $room->getLastSession($chat_user);
-
-            if ($last_session) {
-                $from = new ilDateTime($last_session['connected'], IL_CAL_UNIX);
-                $to = new ilDateTime($last_session['disconnected'], IL_CAL_UNIX);
-            } else {
-                $from = null;
-                $to = null;
-            }
-
-            $messages = $room->getHistory(
-                $from,
-                $to,
-                $chat_user->getUserId()
-            );
-        }
-
-        $from = new ilDateTime();
-        $to = new ilDateTime();
-
-        $this->showMessages($messages, $durationForm, $export, $from, $to);
-    }
-
     public function executeDefault(string $requestedMethod): void
     {
         $this->byDay();
diff --git a/lang/ilias_de.lang b/lang/ilias_de.lang
index 3dbb0b4e9471..211f7e040147 100755
--- a/lang/ilias_de.lang
+++ b/lang/ilias_de.lang
@@ -2981,10 +2981,7 @@ chatroom#:#end_whisper#:#Beenden
 chatroom#:#enter#:#Chat beitreten
 chatroom#:#error_log#:#Chatserver Error-Log-File
 chatroom#:#hint_display_past_msgs#:#Anzahl vergangener Beiträge, die beim Betreten des Chatraums angezeigt werden. Durch die Eingabe von „0“ wird die Anzeige deaktiviert.
-chatroom#:#history_by_day#:#Tagesverlauf
-chatroom#:#history_by_session#:#Sitzungverlauf
 chatroom#:#history_byday_title#:#Zeitraum auswählen
-chatroom#:#history_bysession_title#:#Sitzung auswählen
 chatroom#:#history_cleared#:#Der Nachrichtenverlauf wurde durch die Moderation gelöscht.###Modified as part of gender mainstreaming activities for ILIAS 8
 chatroom#:#history_title_general#:#Unterhaltungen im Chatraum „%s“
 chatroom#:#ilias_chatserver_connection#:#Verbindung ILIAS zum Server
diff --git a/lang/ilias_en.lang b/lang/ilias_en.lang
index fbb0443b76ef..2b29316b9708 100755
--- a/lang/ilias_en.lang
+++ b/lang/ilias_en.lang
@@ -2983,10 +2983,7 @@ chatroom#:#end_whisper#:#Cancel
 chatroom#:#enter#:#Enter Chat Room
 chatroom#:#error_log#:#Chatserver Error-Log
 chatroom#:#hint_display_past_msgs#:#Number of previous messages shown when chat room is entered. A value of ‘0’ disables this feature.
-chatroom#:#history_by_day#:#Daily History
-chatroom#:#history_by_session#:#Session History
 chatroom#:#history_byday_title#:#Show Conversation per Day
-chatroom#:#history_bysession_title#:#Show Conversation per Session
 chatroom#:#history_cleared#:#The message history was deleted by a moderator.
 chatroom#:#history_title_general#:#Conversation in Chat Room "%s"
 chatroom#:#ilias_chatserver_connection#:#ILIAS to Server Connection