move date formatting to a utility.

frontend/src/settings/sections/ApiTokensSection.tsx

@@ -1,6 +1,7 @@
 import { useCallback, useEffect, useMemo, useState } from 'react';
 import type { ChangeEvent, FormEvent } from 'react';
 import type { Identifier } from '../../types/identifiers';
+import { formatDateTime } from '../../utils/date';
 
 interface ApiTokenEntry {
   id?: Identifier;
@@ -61,17 +62,6 @@ interface ApiTokensSectionProps {
   onRefreshCapabilities?: () => void;
 }
 
-const formatDateTime = (value) => {
-  if (!value) {
-    return '—';
-  }
-  const timestamp = new Date(value);
-  if (Number.isNaN(timestamp.getTime())) {
-    return value;
-  }
-  return timestamp.toLocaleString();
-};
-
 const ApiTokensSection = ({
   tokens = [],
   loading = false,

frontend/src/settings/sections/PasskeysSection.tsx

@@ -1,17 +1,7 @@
 import { useCallback, useMemo, useState } from 'react';
 import type { FormEvent } from 'react';
 import type { PasskeyRecord, RegisterPasskeyResult } from '../usePasskeys';
-
-const formatDateTime = (value) => {
-  if (!value) {
-    return '—';
-  }
-  const timestamp = new Date(value);
-  if (Number.isNaN(timestamp.getTime())) {
-    return value;
-  }
-  return timestamp.toLocaleString();
-};
+import { formatDateTime } from '../../utils/date';
 
 interface PasskeysSectionProps {
   passkeys?: PasskeyRecord[];