diff --git a/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/attachment-unit-form/attachment-unit-form.component.ts b/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/attachment-unit-form/attachment-unit-form.component.ts
index 6ed702b59547..1bc42524d04b 100644
--- a/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/attachment-unit-form/attachment-unit-form.component.ts
+++ b/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/attachment-unit-form/attachment-unit-form.component.ts
@@ -1,4 +1,4 @@
-import { Component, ElementRef, OnChanges, ViewChild, computed, inject, input, output, signal } from '@angular/core';
+import { Component, ElementRef, OnChanges, ViewChild, computed, inject, input, output, signal, viewChild } from '@angular/core';
 import dayjs from 'dayjs/esm';
 import { FormBuilder, FormGroup, Validators } from '@angular/forms';
 import { faQuestionCircle, faTimes } from '@fortawesome/free-solid-svg-icons';
@@ -6,6 +6,7 @@ import { ACCEPTED_FILE_EXTENSIONS_FILE_BROWSER, ALLOWED_FILE_EXTENSIONS_HUMAN_RE
 import { CompetencyLectureUnitLink } from 'app/entities/competency.model';
 import { MAX_FILE_SIZE } from 'app/shared/constants/input.constants';
 import { toSignal } from '@angular/core/rxjs-interop';
+import { FormDateTimePickerComponent } from 'app/shared/date-time-picker/date-time-picker.component';
 
 export interface AttachmentUnitFormData {
     formProperties: FormProperties;
@@ -47,6 +48,8 @@ export class AttachmentUnitFormComponent implements OnChanges {
     hasCancelButton = input<boolean>(false);
     onCancel = output<void>();
 
+    datePickerComponent = viewChild(FormDateTimePickerComponent);
+
     // have to handle the file input as a special case at is not part of the reactive form
     @ViewChild('fileInput', { static: false })
     fileInput: ElementRef;
@@ -68,7 +71,7 @@ export class AttachmentUnitFormComponent implements OnChanges {
     private readonly statusChanges = toSignal(this.form.statusChanges ?? 'INVALID');
 
     isFormValid = computed(() => {
-        return (this.statusChanges() === 'VALID' || this.fileName()) && !this.isFileTooBig();
+        return (this.statusChanges() === 'VALID' || this.fileName()) && !this.isFileTooBig() && this.datePickerComponent()?.isValid();
     });
 
     ngOnChanges(): void {
diff --git a/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/online-unit-form/online-unit-form.component.ts b/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/online-unit-form/online-unit-form.component.ts
index 67adf4f2c8dc..241feda894e8 100644
--- a/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/online-unit-form/online-unit-form.component.ts
+++ b/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/online-unit-form/online-unit-form.component.ts
@@ -1,5 +1,5 @@
 import dayjs from 'dayjs/esm';
-import { Component, OnChanges, computed, inject, input, output } from '@angular/core';
+import { Component, OnChanges, computed, inject, input, output, viewChild } from '@angular/core';
 import { AbstractControl, FormBuilder, FormGroup, Validators } from '@angular/forms';
 import { faArrowLeft, faTimes } from '@fortawesome/free-solid-svg-icons';
 import { map } from 'rxjs';
@@ -8,6 +8,7 @@ import { OnlineResourceDTO } from 'app/lecture/lecture-unit/lecture-unit-managem
 import { OnlineUnitService } from 'app/lecture/lecture-unit/lecture-unit-management/onlineUnit.service';
 import { CompetencyLectureUnitLink } from 'app/entities/competency.model';
 import { toSignal } from '@angular/core/rxjs-interop';
+import { FormDateTimePickerComponent } from 'app/shared/date-time-picker/date-time-picker.component';
 
 export interface OnlineUnitFormData {
     name?: string;
@@ -45,6 +46,8 @@ export class OnlineUnitFormComponent implements OnChanges {
     hasCancelButton = input<boolean>(false);
     onCancel = output<void>();
 
+    datePickerComponent = viewChild(FormDateTimePickerComponent);
+
     urlValidator = urlValidator;
 
     private readonly formBuilder = inject(FormBuilder);
@@ -59,7 +62,7 @@ export class OnlineUnitFormComponent implements OnChanges {
     });
 
     private readonly statusChanges = toSignal(this.form.statusChanges ?? 'INVALID');
-    isFormValid = computed(() => this.statusChanges() === 'VALID');
+    isFormValid = computed(() => this.statusChanges() === 'VALID' && this.datePickerComponent()?.isValid());
 
     get nameControl() {
         return this.form.get('name');
diff --git a/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/text-unit-form/text-unit-form.component.ts b/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/text-unit-form/text-unit-form.component.ts
index b6d7b31447b2..3ed05d37b8c1 100644
--- a/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/text-unit-form/text-unit-form.component.ts
+++ b/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/text-unit-form/text-unit-form.component.ts
@@ -1,4 +1,4 @@
-import { Component, OnChanges, OnDestroy, OnInit, computed, inject, input, output } from '@angular/core';
+import { Component, OnChanges, OnDestroy, OnInit, computed, inject, input, output, viewChild } from '@angular/core';
 import dayjs from 'dayjs/esm';
 import { FormBuilder, FormGroup, Validators } from '@angular/forms';
 import { Router } from '@angular/router';
@@ -8,6 +8,7 @@ import { TranslateService } from '@ngx-translate/core';
 import { faTimes } from '@fortawesome/free-solid-svg-icons';
 import { CompetencyLectureUnitLink } from 'app/entities/competency.model';
 import { toSignal } from '@angular/core/rxjs-interop';
+import { FormDateTimePickerComponent } from 'app/shared/date-time-picker/date-time-picker.component';
 
 export interface TextUnitFormData {
     name?: string;
@@ -32,6 +33,8 @@ export class TextUnitFormComponent implements OnInit, OnChanges, OnDestroy {
     hasCancelButton = input<boolean>(false);
     onCancel = output<void>();
 
+    datePickerComponent = viewChild(FormDateTimePickerComponent);
+
     // not included in reactive form
     content: string | undefined;
     contentLoadedFromCache = false;
@@ -46,7 +49,7 @@ export class TextUnitFormComponent implements OnInit, OnChanges, OnDestroy {
     });
 
     private readonly statusChanges = toSignal(this.form.statusChanges ?? 'INVALID');
-    isFormValid = computed(() => this.statusChanges() === 'VALID');
+    isFormValid = computed(() => this.statusChanges() === 'VALID' && this.datePickerComponent()?.isValid());
 
     private markdownChanges = new Subject<string>();
     private markdownChangesSubscription: Subscription;
diff --git a/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/video-unit-form/video-unit-form.component.ts b/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/video-unit-form/video-unit-form.component.ts
index 543526c9491b..0ffea72952dc 100644
--- a/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/video-unit-form/video-unit-form.component.ts
+++ b/src/main/webapp/app/lecture/lecture-unit/lecture-unit-management/video-unit-form/video-unit-form.component.ts
@@ -1,10 +1,11 @@
 import dayjs from 'dayjs/esm';
-import { Component, computed, effect, inject, input, output, untracked } from '@angular/core';
+import { Component, computed, effect, inject, input, output, untracked, viewChild } from '@angular/core';
 import { AbstractControl, FormBuilder, FormGroup, ValidationErrors, Validators } from '@angular/forms';
 import urlParser from 'js-video-url-parser';
 import { faArrowLeft, faTimes } from '@fortawesome/free-solid-svg-icons';
 import { CompetencyLectureUnitLink } from 'app/entities/competency.model';
 import { toSignal } from '@angular/core/rxjs-interop';
+import { FormDateTimePickerComponent } from 'app/shared/date-time-picker/date-time-picker.component';
 
 export interface VideoUnitFormData {
     name?: string;
@@ -72,6 +73,8 @@ export class VideoUnitFormComponent {
     hasCancelButton = input<boolean>();
     onCancel = output<void>();
 
+    datePickerComponent = viewChild(FormDateTimePickerComponent);
+
     videoSourceUrlValidator = videoSourceUrlValidator;
     videoSourceTransformUrlValidator = videoSourceTransformUrlValidator;
 
@@ -84,7 +87,7 @@ export class VideoUnitFormComponent {
         competencyLinks: [undefined as CompetencyLectureUnitLink[] | undefined],
     });
     private readonly statusChanges = toSignal(this.form.statusChanges ?? 'INVALID');
-    isFormValid = computed(() => this.statusChanges() === 'VALID');
+    isFormValid = computed(() => this.statusChanges() === 'VALID' && this.datePickerComponent()?.isValid());
 
     constructor() {
         effect(() => {
diff --git a/src/test/javascript/spec/component/lecture-unit/attachment-unit/attachment-unit-form.component.spec.ts b/src/test/javascript/spec/component/lecture-unit/attachment-unit/attachment-unit-form.component.spec.ts
index 7235e4bba660..6de2fc97f18e 100644
--- a/src/test/javascript/spec/component/lecture-unit/attachment-unit/attachment-unit-form.component.spec.ts
+++ b/src/test/javascript/spec/component/lecture-unit/attachment-unit/attachment-unit-form.component.spec.ts
@@ -5,10 +5,11 @@ import { AttachmentUnitFormComponent, AttachmentUnitFormData } from 'app/lecture
 import { FormDateTimePickerComponent } from 'app/shared/date-time-picker/date-time-picker.component';
 import { ArtemisTranslatePipe } from 'app/shared/pipes/artemis-translate.pipe';
 import dayjs from 'dayjs/esm';
-import { MockComponent, MockDirective, MockPipe } from 'ng-mocks';
+import { MockComponent, MockDirective, MockModule, MockPipe } from 'ng-mocks';
 import { NgbTooltip } from '@ng-bootstrap/ng-bootstrap';
 import { CompetencySelectionComponent } from 'app/shared/competency-selection/competency-selection.component';
 import { MAX_FILE_SIZE } from 'app/shared/constants/input.constants';
+import { OwlDateTimeModule, OwlNativeDateTimeModule } from '@danielmoncada/angular-datetime-picker';
 
 describe('AttachmentUnitFormComponent', () => {
     let attachmentUnitFormComponentFixture: ComponentFixture<AttachmentUnitFormComponent>;
@@ -16,11 +17,11 @@ describe('AttachmentUnitFormComponent', () => {
 
     beforeEach(() => {
         TestBed.configureTestingModule({
-            imports: [ReactiveFormsModule, FormsModule, MockDirective(NgbTooltip)],
+            imports: [ReactiveFormsModule, FormsModule, MockDirective(NgbTooltip), MockModule(OwlDateTimeModule), MockModule(OwlNativeDateTimeModule)],
             declarations: [
                 AttachmentUnitFormComponent,
+                FormDateTimePickerComponent,
                 MockPipe(ArtemisTranslatePipe),
-                MockComponent(FormDateTimePickerComponent),
                 MockComponent(FaIconComponent),
                 MockComponent(CompetencySelectionComponent),
             ],
diff --git a/src/test/javascript/spec/component/lecture-unit/online-unit/online-unit-form.component.spec.ts b/src/test/javascript/spec/component/lecture-unit/online-unit/online-unit-form.component.spec.ts
index 8f4411cd4f40..3032bb1cf7a0 100644
--- a/src/test/javascript/spec/component/lecture-unit/online-unit/online-unit-form.component.spec.ts
+++ b/src/test/javascript/spec/component/lecture-unit/online-unit/online-unit-form.component.spec.ts
@@ -3,7 +3,7 @@ import { OnlineUnitFormComponent, OnlineUnitFormData } from 'app/lecture/lecture
 import { ComponentFixture, TestBed } from '@angular/core/testing';
 import { FormsModule, ReactiveFormsModule } from '@angular/forms';
 import { ArtemisTranslatePipe } from 'app/shared/pipes/artemis-translate.pipe';
-import { MockComponent, MockPipe, MockProvider } from 'ng-mocks';
+import { MockComponent, MockModule, MockPipe, MockProvider } from 'ng-mocks';
 import { FormDateTimePickerComponent } from 'app/shared/date-time-picker/date-time-picker.component';
 import { FaIconComponent } from '@fortawesome/angular-fontawesome';
 import { OnlineUnitService } from 'app/lecture/lecture-unit/lecture-unit-management/onlineUnit.service';
@@ -11,6 +11,9 @@ import { OnlineResourceDTO } from 'app/lecture/lecture-unit/lecture-unit-managem
 import { HttpResponse } from '@angular/common/http';
 import { of } from 'rxjs';
 import { CompetencySelectionComponent } from 'app/shared/competency-selection/competency-selection.component';
+import { OwlDateTimeModule, OwlNativeDateTimeModule } from '@danielmoncada/angular-datetime-picker';
+import { ArtemisTestModule } from '../../../test.module';
+import { NgbTooltipModule } from '@ng-bootstrap/ng-bootstrap';
 
 describe('OnlineUnitFormComponent', () => {
     let onlineUnitFormComponentFixture: ComponentFixture<OnlineUnitFormComponent>;
@@ -18,11 +21,11 @@ describe('OnlineUnitFormComponent', () => {
 
     beforeEach(() => {
         TestBed.configureTestingModule({
-            imports: [ReactiveFormsModule, FormsModule],
+            imports: [ArtemisTestModule, ReactiveFormsModule, FormsModule, MockModule(NgbTooltipModule), MockModule(OwlDateTimeModule), MockModule(OwlNativeDateTimeModule)],
             declarations: [
                 OnlineUnitFormComponent,
+                FormDateTimePickerComponent,
                 MockPipe(ArtemisTranslatePipe),
-                MockComponent(FormDateTimePickerComponent),
                 MockComponent(FaIconComponent),
                 MockComponent(CompetencySelectionComponent),
             ],
diff --git a/src/test/javascript/spec/component/lecture-unit/text-unit/text-unit-form.component.spec.ts b/src/test/javascript/spec/component/lecture-unit/text-unit/text-unit-form.component.spec.ts
index fae301e74331..e54974801b5f 100644
--- a/src/test/javascript/spec/component/lecture-unit/text-unit/text-unit-form.component.spec.ts
+++ b/src/test/javascript/spec/component/lecture-unit/text-unit/text-unit-form.component.spec.ts
@@ -8,9 +8,12 @@ import { TextUnitFormComponent, TextUnitFormData } from 'app/lecture/lecture-uni
 import { FormDateTimePickerComponent } from 'app/shared/date-time-picker/date-time-picker.component';
 import { ArtemisTranslatePipe } from 'app/shared/pipes/artemis-translate.pipe';
 import dayjs from 'dayjs/esm';
-import { MockComponent, MockPipe, MockProvider } from 'ng-mocks';
+import { MockComponent, MockModule, MockPipe, MockProvider } from 'ng-mocks';
 import { MockRouter } from '../../../helpers/mocks/mock-router';
 import { CompetencySelectionComponent } from 'app/shared/competency-selection/competency-selection.component';
+import { ArtemisTestModule } from '../../../test.module';
+import { NgbTooltipModule } from '@ng-bootstrap/ng-bootstrap';
+import { OwlDateTimeModule, OwlNativeDateTimeModule } from '@danielmoncada/angular-datetime-picker';
 
 @Component({ selector: 'jhi-markdown-editor-monaco', template: '' })
 class MarkdownEditorStubComponent {
@@ -43,11 +46,11 @@ describe('TextUnitFormComponent', () => {
         });
 
         TestBed.configureTestingModule({
-            imports: [ReactiveFormsModule, FormsModule],
+            imports: [ArtemisTestModule, ReactiveFormsModule, FormsModule, MockModule(NgbTooltipModule), MockModule(OwlDateTimeModule), MockModule(OwlNativeDateTimeModule)],
             declarations: [
                 TextUnitFormComponent,
                 MarkdownEditorStubComponent,
-                MockComponent(FormDateTimePickerComponent),
+                FormDateTimePickerComponent,
                 MockPipe(ArtemisTranslatePipe),
                 MockComponent(CompetencySelectionComponent),
             ],
diff --git a/src/test/javascript/spec/component/lecture-unit/video-unit/video-unit-form.component.spec.ts b/src/test/javascript/spec/component/lecture-unit/video-unit/video-unit-form.component.spec.ts
index 445163b967ff..84180448c005 100644
--- a/src/test/javascript/spec/component/lecture-unit/video-unit/video-unit-form.component.spec.ts
+++ b/src/test/javascript/spec/component/lecture-unit/video-unit/video-unit-form.component.spec.ts
@@ -3,10 +3,13 @@ import { VideoUnitFormComponent, VideoUnitFormData } from 'app/lecture/lecture-u
 import { ComponentFixture, TestBed } from '@angular/core/testing';
 import { FormsModule, ReactiveFormsModule } from '@angular/forms';
 import { ArtemisTranslatePipe } from 'app/shared/pipes/artemis-translate.pipe';
-import { MockComponent, MockPipe } from 'ng-mocks';
+import { MockComponent, MockModule, MockPipe } from 'ng-mocks';
 import { FormDateTimePickerComponent } from 'app/shared/date-time-picker/date-time-picker.component';
 import { FaIconComponent } from '@fortawesome/angular-fontawesome';
 import { CompetencySelectionComponent } from 'app/shared/competency-selection/competency-selection.component';
+import { OwlDateTimeModule, OwlNativeDateTimeModule } from '@danielmoncada/angular-datetime-picker';
+import { ArtemisTestModule } from '../../../test.module';
+import { NgbTooltipModule } from '@ng-bootstrap/ng-bootstrap';
 
 describe('VideoUnitFormComponent', () => {
     const validYouTubeUrl = 'https://www.youtube.com/watch?v=8iU8LPEa4o0';
@@ -16,11 +19,11 @@ describe('VideoUnitFormComponent', () => {
 
     beforeEach(() => {
         TestBed.configureTestingModule({
-            imports: [ReactiveFormsModule, FormsModule],
+            imports: [ArtemisTestModule, ReactiveFormsModule, FormsModule, MockModule(NgbTooltipModule), MockModule(OwlDateTimeModule), MockModule(OwlNativeDateTimeModule)],
             declarations: [
                 VideoUnitFormComponent,
+                FormDateTimePickerComponent,
                 MockPipe(ArtemisTranslatePipe),
-                MockComponent(FormDateTimePickerComponent),
                 MockComponent(FaIconComponent),
                 MockComponent(CompetencySelectionComponent),
             ],