diff --git a/frontend/src/components/ProjectTeacherComponent.tsx b/frontend/src/components/ProjectTeacherComponent.tsx
index eee80263..0b73abb7 100644
--- a/frontend/src/components/ProjectTeacherComponent.tsx
+++ b/frontend/src/components/ProjectTeacherComponent.tsx
@@ -3,7 +3,7 @@ import Inputfield from "./Inputfield.tsx";
 import {SelectionBox} from "./SelectionBox.tsx";
 import 'react-calendar/dist/Calendar.css';
 import {FaEraser, FaUpload} from "react-icons/fa";
-import {ProjectTeacher, Value} from "../types/project.ts";
+import {ProjectTeacher} from "../types/project.ts";
 import "../assets/styles/teacher_components.css"
 import SimpleTests from "./SimpleTests/SimpleTests.tsx";
 import {TeacherOrStudent} from "./SimpleTests/TeacherOrStudentEnum.tsx";
@@ -34,7 +34,7 @@ export function ProjectTeacherComponent(props: {
     const [courseName, setCourseName] = useState<string>(props.project.courseName)
     const [hours, setHours] = useState<number>(props.project.hours);
     const [minutes, setMinutes] = useState<number>(props.project.minutes);
-    const [deadline, setDeadline] = useState<Value>(props.project.deadline);
+    const [deadline, setDeadline] = useState<string>(props.project.deadline);
     const [description, setDescription] = useState(props.project.description);
     const [max_students, setMaxStudents] = useState(props.project.maxGroupMembers);
     const [requiredFiles, setRequiredFiles] = useState(props.project.requiredFiles);
@@ -78,8 +78,8 @@ export function ProjectTeacherComponent(props: {
             _.isEqual(dockerString, initialValues.value10) &&
             _.isEqual(visible, initialValues.value11) &&
             _.isEqual(archived, initialValues.value12);
-        const second_part_1 = (deadline as Date).toDateString();
-        const second_part_2 = (initialValues.value5 as Date).toDateString();
+        const second_part_1 = deadline;
+        const second_part_2 = initialValues.value5;
         const second_part = _.isEqual(second_part_1, second_part_2);
         const third_part = groupProject && Number.isNaN(max_students);
         return projectName !== "" && (props.is_new === true || !((first_part && second_part) || third_part));
@@ -154,7 +154,7 @@ export function ProjectTeacherComponent(props: {
     async function handleSaveClick() {
         const projectInput: ProjectInput = {
             name: projectName,
-            deadline: (deadline as Date).toISOString(),
+            deadline: deadline,
             visible: visible,
             archived: archived,
             description: description,
@@ -275,7 +275,12 @@ export function ProjectTeacherComponent(props: {
                         className="field-body is-flex is-flex-direction-column is-align-items-start is-justify-content-center">
                         <div>
                             <div>
-                                <Calendar onChange={date => setDeadline(date)} value={deadline}
+                                <Calendar onChange={date => {
+                                    if (date) {
+                                        setDeadline((new Date(date.toLocaleString())).toISOString())
+                                    }
+                                }}
+                                          value={new Date(deadline)}
                                           locale={t('create_project.deadline.locale')}/>
                             </div>
                             <div className="is-horizontal field is-justify-content-center mt-2">
diff --git a/frontend/src/pages/teacher/CreateProject.tsx b/frontend/src/pages/teacher/CreateProject.tsx
index 128430ef..05a134d6 100644
--- a/frontend/src/pages/teacher/CreateProject.tsx
+++ b/frontend/src/pages/teacher/CreateProject.tsx
@@ -22,7 +22,7 @@ export function CreateProject(): JSX.Element {
         projectId: -1,
         courseName: data.courses[0].course_name,
         all_courses: data.courses,
-        deadline: new Date(Date.now()),
+        deadline: (new Date(Date.now())).toISOString(),
         description: "",
         groupProject: false,
         hours: 0,
diff --git a/frontend/src/pages/teacher/ProjectViewTeacher.tsx b/frontend/src/pages/teacher/ProjectViewTeacher.tsx
index 7c823d50..83dd92bb 100644
--- a/frontend/src/pages/teacher/ProjectViewTeacher.tsx
+++ b/frontend/src/pages/teacher/ProjectViewTeacher.tsx
@@ -32,7 +32,7 @@ export default function ProjectViewTeacher() {
         courseName: project_data.course_name,
         hours: deadline_date.getHours(),
         minutes: deadline_date.getMinutes(),
-        deadline: deadline_date,
+        deadline: deadline_date.toISOString(),
         visible: project_data.project_visible,
         archived: project_data.project_archived,
         description: project_data.project_description,
diff --git a/frontend/src/types/project.ts b/frontend/src/types/project.ts
index 8971fc05..39103e0a 100644
--- a/frontend/src/types/project.ts
+++ b/frontend/src/types/project.ts
@@ -11,7 +11,7 @@ export type ProjectTeacher = {
     courseName: string,
     hours: number,
     minutes: number,
-    deadline: Value,
+    deadline: string,
     visible: boolean,
     archived: boolean,
     description: string,
diff --git a/frontend/src/utils/helper.ts b/frontend/src/utils/helper.ts
index 934b2234..0fd7b11e 100644
--- a/frontend/src/utils/helper.ts
+++ b/frontend/src/utils/helper.ts
@@ -1,5 +1,8 @@
 
 export function deadline_to_string(deadline: string){
+    if (deadline === "-"){
+        return "-"
+    }
     const deadline_date = new Date(deadline)
     const hours = String(deadline_date.getHours()).padStart(2, '0');
     const minutes = String(deadline_date.getMinutes()).padStart(2, '0');