diff --git a/application/controllers/api/frontend/v1/AuthInfo.php b/application/controllers/api/frontend/v1/AuthInfo.php
new file mode 100644
index 000000000..1362aee18
--- /dev/null
+++ b/application/controllers/api/frontend/v1/AuthInfo.php
@@ -0,0 +1,52 @@
+<?php
+/**
+ * Copyright (C) 2024 fhcomplete.org
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+if (!defined('BASEPATH')) exit('No direct script access allowed');
+
+class AuthInfo extends FHCAPI_Controller
+{
+
+	/**
+	 * Object initialization
+	 */
+	public function __construct()
+	{
+		parent::__construct([
+			'getAuthUID' => self::PERM_LOGGED,
+		]);
+
+		$this->uid = getAuthUID();
+		$this->pid = getAuthPersonID();
+	}
+
+	//------------------------------------------------------------------------------------------------------------------
+	// Public methods
+
+	/**
+	 * returns the uid of the currently logged in user
+	 * @access public
+	 *
+	 */
+	public function getAuthUID()
+	{
+		$this->terminateWithSuccess(['uid'=>$this->uid]);
+	}
+	
+	
+}
+
diff --git a/application/models/organisation/Studiensemester_model.php b/application/models/organisation/Studiensemester_model.php
index 22a7ca604..0ea5b9328 100644
--- a/application/models/organisation/Studiensemester_model.php
+++ b/application/models/organisation/Studiensemester_model.php
@@ -181,7 +181,7 @@ class Studiensemester_model extends DB_Model
 		$query = "
 			SELECT  studiensemester_kurzbz, start, ende
 			FROM	public.tbl_studiensemester
-			WHERE   ( ende >= ?::date AND start <= ?::date ) OR ( ende >= ?::date + '45 days'::interval AND start <= ?::date + '45 days'::interval )
+			WHERE   ( ende >= ?::date AND start <= ?::date ) OR ( ende >= ?::date + '-45 days'::interval AND start <= ?::date + '-45 days'::interval )
 			ORDER BY start DESC
 			LIMIT 1";
 
diff --git a/application/views/Cis/InfoTerminal.php b/application/views/Cis/InfoTerminal.php
index e25368286..ed05d1857 100644
--- a/application/views/Cis/InfoTerminal.php
+++ b/application/views/Cis/InfoTerminal.php
@@ -10,7 +10,7 @@ $this->load->view(
 );
 ?>
 
-<iframe style="width:100%; height:100%;" id="Infoterminal" src="<?php echo base_url() . 'cis/infoterminal/'; ?>" name="Infoterminal" frameborder="0" >
+<iframe style="width:100%; height:100%;" id="Infoterminal" src="<?php echo base_url() . 'cis/infoterminal/?forcelogin=true'; ?>" name="Infoterminal" frameborder="0" >
 No iFrames
 </iframe>
 <?php $this->load->view('templates/CISVUE-Footer', $includesArray); ?>
diff --git a/cis/infoterminal/index.php b/cis/infoterminal/index.php
index 852526108..1b4c7d637 100644
--- a/cis/infoterminal/index.php
+++ b/cis/infoterminal/index.php
@@ -38,6 +38,14 @@ require_once('../../include/authentication.class.php');
 require_once('../../include/addon.class.php');
 require_once('../../include/'.EXT_FKT_PATH.'/serviceterminal.inc.php');
 
+// 2025-02-05 ma0080 add query parameter to force login e.g. when used in iframe in CIS4.0 begin
+if( isset($_GET['forcelogin']) && !isset($_SERVER['PHP_AUTH_USER']) ) {
+  header('WWW-Authenticate: Basic Realm="' . AUTH_NAME . '"');
+  http_response_code(401);
+  die();
+}
+// 2025-02-05 ma0080 add query parameter to force login e.g. when used in iframe in CIS4.0 end
+
 	if (!$db = new basis_db())
 		$db=false;
 
diff --git a/public/js/api/authinfo.js b/public/js/api/authinfo.js
new file mode 100644
index 000000000..618cf2e26
--- /dev/null
+++ b/public/js/api/authinfo.js
@@ -0,0 +1,10 @@
+
+export default {
+	getAuthUID() {
+		return this.$fhcApi.get(
+			'/api/frontend/v1/AuthInfo/getAuthUID',
+			{ }
+		);
+	},
+	
+};
\ No newline at end of file
diff --git a/public/js/api/fhcapifactory.js b/public/js/api/fhcapifactory.js
index 04744409b..378d979ab 100644
--- a/public/js/api/fhcapifactory.js
+++ b/public/js/api/fhcapifactory.js
@@ -35,7 +35,8 @@ import lehre from "./lehre.js";
 import addons from "./addons.js";
 import studiengang from "./studiengang.js";
 import menu from "./menu.js";
-import dashboard from "./dashboard";
+import dashboard from "./dashboard.js";
+import authinfo from "./authinfo.js";
 
 export default {
     search,
@@ -59,4 +60,5 @@ export default {
     addons,
 	studiengang,
 	menu,
+	authinfo,
 };
diff --git a/public/js/components/Cis/Stundenplan/Stundenplan.js b/public/js/components/Cis/Stundenplan/Stundenplan.js
index a8b7d0c99..d35c9c536 100644
--- a/public/js/components/Cis/Stundenplan/Stundenplan.js
+++ b/public/js/components/Cis/Stundenplan/Stundenplan.js
@@ -17,8 +17,12 @@ export const Stundenplan = {
 			studiensemester_kurzbz:null,
 			studiensemester_start:null,
 			studiensemester_ende:null,
+			uid:null,
 		}
 	},
+	props: [
+		"viewData",
+	],
 	watch: {
 		weekFirstDay: {
 			handler: async function (newValue) {
@@ -31,22 +35,19 @@ export const Stundenplan = {
 			immediate: true,
 		}
 	},
-	props: [
-		"viewData",
-	],
 	components: {
 		FhcCalendar, LvModal, LvMenu, LvInfo
 	},
 	computed:{
 		downloadLinks: function(){
-			if(!this.studiensemester_start || !this.studiensemester_ende)return;
+			if(!this.studiensemester_start || !this.studiensemester_ende || !this.uid )return;
 			let start = new Date(this.studiensemester_start);
 			start = Math.floor(start.getTime()/1000);
 			let ende = new Date(this.studiensemester_ende);
 			ende = Math.floor(ende.getTime() / 1000);
 
-			let download_link = (format, version = "", target = "") => `${FHC_JS_DATA_STORAGE_OBJECT.app_root}cis/private/lvplan/stpl_kalender.php?type=student&pers_uid=${this.viewData.uid}&begin=${start}&ende=${ende}&format=${format}${version ? '&version=' + version : ''}${target ? '&target=' + target : ''}`;
-			return [{ title: "excel", link: download_link('excel') }, { title: "csv", link: download_link('csv') }, { title: "ical1", link: download_link('ical', '1', 'ical') }, { title: "ical2", link: download_link('ical', '2', 'ical') }];
+			let download_link = (format, version = "", target = "") => `${FHC_JS_DATA_STORAGE_OBJECT.app_root}cis/private/lvplan/stpl_kalender.php?type=student&pers_uid=${this.uid}&begin=${start}&ende=${ende}&format=${format}${version ? '&version=' + version : ''}${target ? '&target=' + target : ''}`;
+			return [{ title: "excel", icon: 'fa-solid fa-file-excel', link: download_link('excel') }, { title: "csv", icon: 'fa-solid fa-file-csv', link: download_link('csv') }, { title: "ical1", icon: 'fa-regular fa-calendar', link: download_link('ical', '1', 'ical') }, { title: "ical2", icon: 'fa-regular fa-calendar', link: download_link('ical', '2', 'ical') }];
 		},
 		lv_id() { // computed so we can theoretically change path/lva selection and reload without page refresh
 			const pathParts = window.location.pathname.split('/').filter(Boolean);
@@ -149,6 +150,10 @@ export const Stundenplan = {
 	},
 	created()
 	{
+		this.$fhcApi.factory.authinfo.getAuthUID().then((res) => res.data)
+		.then(data=>{
+			this.uid = data.uid;
+		})
 		this.loadEvents();
 	},
 	beforeUnmount() {
@@ -160,8 +165,13 @@ export const Stundenplan = {
 	<lv-modal v-if="currentlySelectedEvent" :event="currentlySelectedEvent" ref="lvmodal" />
 	<fhc-calendar @selectedEvent="setSelectedEvent" :initial-date="currentDay" @change:range="updateRange" :events="events" initial-mode="week" show-weeks @select:day="selectDay" v-model:minimized="minimized">
 		<template #calendarDownloads>
-			<div v-for="{title,link} in downloadLinks">
-				<a :href="link" class="m-1 btn btn-outline-secondary">{{title}}</a>
+			<div v-for="{title,icon,link} in downloadLinks">
+				<a :href="link" :title="title" class="py-1 px-2 m-1 btn btn-outline-secondary">
+					<div class="d-flex flex-column">
+						<i :class="icon"></i>
+						<span class="small">{{title}}</span>
+					</div>
+				</a>
 			</div>
 		</template>
 		<template #monthPage="{event,day}">