diff --git a/frontend/src/App.jsx b/frontend/src/App.jsx
index 8b0df8b..fcc1f24 100644
--- a/frontend/src/App.jsx
+++ b/frontend/src/App.jsx
@@ -1347,7 +1347,11 @@ function ChangelogModal({ user, toast, onClose, onRead }) {
                     </div>
                     <div style={{display:'flex',alignItems:'center',gap:6,flexShrink:0}}>
                       <span style={{color:'rgba(255,255,255,0.2)',fontFamily:'monospace',fontSize:9}}>
-                        {e.build_time || fmtDate(e.created_at)}
+                        {e.build_time
+                          ? (isNaN(Number(e.build_time))
+                              ? e.build_time  // altes Format: bereits lesbarer String
+                              : new Date(Number(e.build_time)*1000).toLocaleString('de-DE',{timeZone:'Europe/Berlin',day:'2-digit',month:'2-digit',year:'numeric',hour:'2-digit',minute:'2-digit'}))
+                          : fmtDate(e.created_at)}
                       </span>
                       {isAdmin && (
                         <button onClick={()=>del(e.id)}
@@ -1473,7 +1477,7 @@ function Dashboard({ toast, mobile, setActive, unreadMsgs=0, unreadBoard=0, unre
           letterSpacing:1, padding:0, textDecoration:'underline dotted',
           textUnderlineOffset:3 }}>
           {typeof __BUILD_TIME__ !== 'undefined' && __BUILD_TIME__
-            ? `Letzte Versionierung: ${__BUILD_TIME__}` : 'Changelog'}
+            ? `Letzte Versionierung: ${new Date(Number(__BUILD_TIME__)*1000).toLocaleString('de-DE',{timeZone:'Europe/Berlin',day:'2-digit',month:'2-digit',year:'numeric',hour:'2-digit',minute:'2-digit'})}` : 'Changelog'}
         </button>
         <button onClick={()=>setShowBoard(true)} style={{
           position:'relative', background:'rgba(255,255,255,0.04)',