diff --git a/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/app/components/forms/user-update-form/user-update-form.component.html b/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/app/components/forms/user-update-form/user-update-form.component.html
index 3e4ca95..85ec053 100644
--- a/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/app/components/forms/user-update-form/user-update-form.component.html
+++ b/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/app/components/forms/user-update-form/user-update-form.component.html
@@ -43,11 +43,11 @@
         <mat-form-field>
             <mat-label>Datumsformat</mat-label>
             <mat-select [(value)]="user.dateFormat" [(ngModel)]="user.dateFormat">
-              <mat-option value="dd.MM.yyyy">dd.MM.yyyy</mat-option>
-              <mat-option value="MM.dd.yyyy">MM.dd.yyyy</mat-option>
-              <mat-option value="yyyy-MM-dd">yyyy-MM-dd</mat-option>
+                @for (format of allowedDateFormats; track format) {
+                <mat-option [value]="format.value">{{format.name}}</mat-option>
+                }
             </mat-select>
-          </mat-form-field>
+        </mat-form-field>
     </div>
     <!-- comment -->
     <div class="dd-row input-row">
diff --git a/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/app/components/forms/user-update-form/user-update-form.component.ts b/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/app/components/forms/user-update-form/user-update-form.component.ts
index eaa8485..9e05da1 100644
--- a/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/app/components/forms/user-update-form/user-update-form.component.ts
+++ b/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/app/components/forms/user-update-form/user-update-form.component.ts
@@ -15,6 +15,7 @@ import { UserService } from '../../../services/api/user.service';
 import { RefreshService } from '../../../services/button/refresh.service';
 import Swal from 'sweetalert2';
 import { MatSelectModule } from '@angular/material/select';
+import { env } from '../../../../environments/environment'
 
 @Component({
   selector: 'app-user-update-form',
@@ -29,6 +30,10 @@ export class UserUpdateFormComponent {
 
   readonly user: User = inject(MAT_DIALOG_DATA);
 
+  get allowedDateFormats(): Array<{ value: string, name: string }> {
+    return env.constants.date_formats;
+  }
+
   readonly username = new FormControl(this.user.username, [Validators.required]);
   readonly email = new FormControl(this.user.email, [Validators.required, Validators.email]);
   readonly name = new FormControl(this.user.prename, [Validators.required]);
@@ -79,7 +84,7 @@ export class UserUpdateFormComponent {
       this.user.name = this.surname.value!;
       this.user.shortname = this.shortname.value!;
       this.user.comment = this.comment.value!;
-      
+
       this.uService.update(this.user).subscribe({
         next: () => {
           this.rService.executeAll();
diff --git a/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/environments/environment.prod.ts b/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/environments/environment.prod.ts
index a6180a7..68c3399 100644
--- a/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/environments/environment.prod.ts
+++ b/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/environments/environment.prod.ts
@@ -53,7 +53,7 @@ export const env = {
                     field: 'email'
                 },
                 {
-                    header:'Kommentar',
+                    header: 'Kommentar',
                     field: 'comment'
                 },
                 {
@@ -199,5 +199,21 @@ export const env = {
             },
         ]
     },
-    config_url: "/assets/config.json"
+    config_url: "/assets/config.json",
+    constants: {
+        date_formats: [
+            {
+                value: "dd.MM.yyyy",
+                name: "dd.MM.yyyy",
+            },
+            {
+                value: "MM.dd.yyyy",
+                name: "MM.dd.yyyy",
+            },
+            {
+                value: "yyyy-MM-dd",
+                name: "yyyy-MM-dd",
+            }
+        ]
+    }
 };
diff --git a/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/environments/environment.ts b/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/environments/environment.ts
index 4c6deb3..17f449c 100644
--- a/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/environments/environment.ts
+++ b/DigitalData.UserManager.API/ClientApp/user_manager_ui/src/environments/environment.ts
@@ -53,7 +53,7 @@ export const env = {
                     field: 'email'
                 },
                 {
-                    header:'Kommentar',
+                    header: 'Kommentar',
                     field: 'comment'
                 },
                 {
@@ -195,5 +195,21 @@ export const env = {
             },
         ]
     },
-    config_url: "/assets/config.json"
-};
+    config_url: "/assets/config.json",
+    constants: {
+        date_formats: [
+            {
+                value: "dd.MM.yyyy",
+                name: "dd.MM.yyyy",
+            },
+            {
+                value: "MM.dd.yyyy",
+                name: "MM.dd.yyyy",
+            },
+            {
+                value: "yyyy-MM-dd",
+                name: "yyyy-MM-dd",
+            }
+        ]
+    }
+};
\ No newline at end of file