diff --git a/frontend/src/lib/utils/date.ts b/frontend/src/lib/utils/date.ts
new file mode 100644
index 00000000..80ff123c
--- /dev/null
+++ b/frontend/src/lib/utils/date.ts
@@ -0,0 +1,11 @@
+/**
+ * Format an ISO date string (YYYY-MM-DD) for display.
+ * Uses T12:00:00 to avoid UTC timezone off-by-one when converting to local time.
+ */
+export function formatDate(isoDate: string): string {
+    return new Intl.DateTimeFormat('de-DE', {
+        day: 'numeric',
+        month: 'long',
+        year: 'numeric'
+    }).format(new Date(isoDate + 'T12:00:00'));
+}
diff --git a/frontend/src/routes/admin/+page.server.ts b/frontend/src/routes/admin/+page.server.ts
index ce47149c..1b385b17 100644
--- a/frontend/src/routes/admin/+page.server.ts
+++ b/frontend/src/routes/admin/+page.server.ts
@@ -2,6 +2,16 @@ import { error, fail } from '@sveltejs/kit';
 import { createApiClient } from '$lib/api.server';
 import { getErrorMessage } from '$lib/errors';
 
+type ApiResult = { response: Response; error?: unknown };
+
+function toActionResult(result: ApiResult) {
+    if (!result.response.ok) {
+        const code = (result.error as { code?: string } | undefined)?.code;
+        return fail(result.response.status, { success: false, message: getErrorMessage(code) });
+    }
+    return { success: true };
+}
+
 export async function load({ fetch, locals }) {
     const user = locals.user;
     const hasAdmin = user?.groups?.some((g: { permissions: string[] }) => g.permissions.includes('ADMIN'));
@@ -35,11 +45,7 @@ export const actions = {
             }
         });
 
-        if (!result.response.ok) {
-            const code = (result.error as unknown as { code?: string })?.code;
-            return fail(result.response.status, { success: false, message: getErrorMessage(code) });
-        }
-        return { success: true };
+        return toActionResult(result);
     },
 
     deleteUser: async ({ request, fetch }) => {
@@ -51,11 +57,7 @@ export const actions = {
             params: { path: { id } }
         });
 
-        if (!result.response.ok) {
-            const code = (result.error as unknown as { code?: string })?.code;
-            return fail(result.response.status, { success: false, message: getErrorMessage(code) });
-        }
-        return { success: true };
+        return toActionResult(result);
     },
 
     updateTag: async ({ request, fetch }) => {
@@ -68,11 +70,7 @@ export const actions = {
             body: { name: data.get('name') as string }
         });
 
-        if (!result.response.ok) {
-            const code = (result.error as unknown as { code?: string })?.code;
-            return fail(result.response.status, { success: false, message: getErrorMessage(code) });
-        }
-        return { success: true };
+        return toActionResult(result);
     },
 
     deleteTag: async ({ request, fetch }) => {
@@ -84,11 +82,7 @@ export const actions = {
             params: { path: { id } }
         });
 
-        if (!result.response.ok) {
-            const code = (result.error as unknown as { code?: string })?.code;
-            return fail(result.response.status, { success: false, message: getErrorMessage(code) });
-        }
-        return { success: true };
+        return toActionResult(result);
     },
 
     createGroup: async ({ request, fetch }) => {
@@ -102,11 +96,7 @@ export const actions = {
             }
         });
 
-        if (!result.response.ok) {
-            const code = (result.error as unknown as { code?: string })?.code;
-            return fail(result.response.status, { success: false, message: getErrorMessage(code) });
-        }
-        return { success: true };
+        return toActionResult(result);
     },
 
     updateGroup: async ({ request, fetch }) => {
@@ -122,11 +112,7 @@ export const actions = {
             }
         });
 
-        if (!result.response.ok) {
-            const code = (result.error as unknown as { code?: string })?.code;
-            return fail(result.response.status, { success: false, message: getErrorMessage(code) });
-        }
-        return { success: true };
+        return toActionResult(result);
     },
 
     deleteGroup: async ({ request, fetch }) => {
@@ -138,10 +124,6 @@ export const actions = {
             params: { path: { id } }
         });
 
-        if (!result.response.ok) {
-            const code = (result.error as unknown as { code?: string })?.code;
-            return fail(result.response.status, { success: false, message: getErrorMessage(code) });
-        }
-        return { success: true };
+        return toActionResult(result);
     }
 };