diff --git a/backend/src/consoleLog.js b/backend/src/consoleLog.js
index 89235bd..9dc4a88 100644
--- a/backend/src/consoleLog.js
+++ b/backend/src/consoleLog.js
@@ -14,10 +14,16 @@ function stringifyArg(a) {
   try { return JSON.stringify(a); } catch { return String(a); }
 }
 
+function localTimestamp() {
+  const d = new Date();
+  const pad = (n, len=2) => String(n).padStart(len, '0');
+  return `${d.getFullYear()}-${pad(d.getMonth()+1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}:${pad(d.getSeconds())}.${pad(d.getMilliseconds(),3)}`;
+}
+
 function appendLine(level, args) {
   try {
     const msg = args.map(stringifyArg).join(' ');
-    fs.appendFileSync(LOG_FILE, `[${new Date().toISOString()}] [${level}] ${msg}\n`);
+    fs.appendFileSync(LOG_FILE, `[${localTimestamp()}] [${level}] ${msg}\n`);
   } catch {
     // Darf niemals die eigentliche Konsolen-Ausgabe verhindern
   }
@@ -34,7 +40,7 @@ function pruneOldLines() {
     const lines = content.split('\n').filter(line => {
       const m = line.match(/^\[([^\]]+)\]/);
       if (!m) return true;
-      const t = new Date(m[1]).getTime();
+      const t = new Date(m[1].replace(' ', 'T')).getTime();
       return Number.isNaN(t) || t >= cutoff;
     });
     fs.writeFileSync(LOG_FILE, lines.join('\n'));