diff --git a/webui/src/features/admin/ModuleManagementPanel.tsx b/webui/src/features/admin/ModuleManagementPanel.tsx
index d506a92..a63c9f5 100644
--- a/webui/src/features/admin/ModuleManagementPanel.tsx
+++ b/webui/src/features/admin/ModuleManagementPanel.tsx
@@ -1,6 +1,6 @@
 import { useEffect, useState } from "react";
 import type { ApiSettings } from "@govoplan/core-webui";
-import { AdminPageLayout, adminErrorMessage, Button, dispatchPlatformModulesChanged, MetricCard, StatusBadge, ToggleSwitch, i18nMessage, useUnsavedDraftGuard } from "@govoplan/core-webui";
+import { AdminPageLayout, adminErrorMessage, Button, dispatchPlatformModulesChanged, formatDateTime, MetricCard, StatusBadge, ToggleSwitch, i18nMessage, useUnsavedDraftGuard, type FormatDateTimeOptions } from "@govoplan/core-webui";
 import {
   cancelModuleInstallerRequest,
   clearModuleInstallPlan,
@@ -596,10 +596,10 @@ export default function ModuleManagementPanel({ settings, canWrite, canAccessMai
                     <StatusBadge status={statusTone(request.status)} label={request.status} />
                   </div>
                   <div className="module-management-details">
-                    <span>i18n:govoplan-admin.created.0c78dab1 {formatDateTime(request.created_at)}</span>
-                    <span>i18n:govoplan-admin.started.fe3824e9 {formatDateTime(request.started_at)}</span>
-                    <span>i18n:govoplan-admin.finished.4b52fe3f {formatDateTime(request.finished_at)}</span>
-                    {request.cancelled_at && <span>i18n:govoplan-admin.cancelled.8c9dcfa8 {formatDateTime(request.cancelled_at)}</span>}
+                    <span>i18n:govoplan-admin.created.0c78dab1 {formatDateTime(request.created_at, ADMIN_DATE_TIME_OPTIONS)}</span>
+                    <span>i18n:govoplan-admin.started.fe3824e9 {formatDateTime(request.started_at, ADMIN_DATE_TIME_OPTIONS)}</span>
+                    <span>i18n:govoplan-admin.finished.4b52fe3f {formatDateTime(request.finished_at, ADMIN_DATE_TIME_OPTIONS)}</span>
+                    {request.cancelled_at && <span>i18n:govoplan-admin.cancelled.8c9dcfa8 {formatDateTime(request.cancelled_at, ADMIN_DATE_TIME_OPTIONS)}</span>}
                     {request.retry_of && <span>i18n:govoplan-admin.retry_of.3a6bb304 {request.retry_of}</span>}
                     {traceId(request.trace) && <span>i18n:govoplan-admin.trace.04a75036 <code>{traceId(request.trace)}</code></span>}
                   </div>
@@ -639,8 +639,8 @@ export default function ModuleManagementPanel({ settings, canWrite, canAccessMai
                     {run.request_id && <span>i18n:govoplan-admin.request.43c2e7a7 {run.request_id}</span>}
                     {traceId(run.trace) && <span>i18n:govoplan-admin.trace.04a75036 <code>{traceId(run.trace)}</code></span>}
                     <span>i18n:govoplan-admin.commands.f6a34aed {run.commands_count}</span>
-                    <span>i18n:govoplan-admin.started.fe3824e9 {formatDateTime(run.started_at)}</span>
-                    <span>i18n:govoplan-admin.finished.4b52fe3f {formatDateTime(run.finished_at)}</span>
+                    <span>i18n:govoplan-admin.started.fe3824e9 {formatDateTime(run.started_at, ADMIN_DATE_TIME_OPTIONS)}</span>
+                    <span>i18n:govoplan-admin.finished.4b52fe3f {formatDateTime(run.finished_at, ADMIN_DATE_TIME_OPTIONS)}</span>
                   </div>
                   {run.error && <p className="module-installer-run-error">{run.error}</p>}
                 </div>
@@ -665,7 +665,7 @@ function LicenseStatus({ license }: {license: ModuleLicenseDiagnostics;}) {
       </div>
       <p className="module-package-catalog-description">{label}</p>
       <div className="module-management-details">
-        <span>i18n:govoplan-admin.valid.b374b8f9 {formatDateTime(license.valid_from)} to {formatDateTime(license.valid_until)}</span>
+        <span>i18n:govoplan-admin.valid.b374b8f9 {formatDateTime(license.valid_from, ADMIN_DATE_TIME_OPTIONS)} to {formatDateTime(license.valid_until, ADMIN_DATE_TIME_OPTIONS)}</span>
         <span>i18n:govoplan-admin.features.5df81ffa {license.features.length ? license.features.join(", ") : "none"}</span>
         {license.required_features.length > 0 && <span>i18n:govoplan-admin.required.d5793988 {license.required_features.join(", ")}</span>}
         {license.missing_features.length > 0 && <span>i18n:govoplan-admin.missing.feb2bbaa {license.missing_features.join(", ")}</span>}
@@ -847,12 +847,16 @@ function licenseLabel(license: ModuleLicenseDiagnostics): string {
   return "i18n:govoplan-admin.unsigned.e91344ea";
 }
 
-function formatDateTime(value?: string | null): string {
-  if (!value) return "i18n:govoplan-admin.not_recorded.9925ee3c";
-  const date = new Date(value);
-  if (Number.isNaN(date.getTime())) return value;
-  return date.toLocaleString();
-}
+const ADMIN_DATE_TIME_OPTIONS: FormatDateTimeOptions = {
+  fallback: "i18n:govoplan-admin.not_recorded.9925ee3c",
+  year: "numeric",
+  month: "numeric",
+  day: "numeric",
+  hour: "numeric",
+  minute: "numeric",
+  second: "numeric",
+  timeZoneName: undefined
+};
 
 function traceId(value?: Record<string, unknown> | null): string {
   const correlationId = value?.correlation_id;