diff --git a/lagebild/lagebild.js b/lagebild/lagebild.js
index 4bb0d7b..f8f40c2 100644
--- a/lagebild/lagebild.js
+++ b/lagebild/lagebild.js
@@ -1048,7 +1048,17 @@ var Lagebild = {
         if (!s) return s;
         s = String(s).trim();
         if (/[Zz]$/.test(s) || /[+-]\d{2}:?\d{2}$/.test(s)) return s;
-        return s.replace(' ', 'T') + 'Z';
+        // Naive Timestamps aus der DB sind Europe/Berlin Lokalzeit.
+        // Korrekten UTC-Offset ermitteln (CET +01:00 / CEST +02:00).
+        var iso = s.replace(' ', 'T');
+        var temp = new Date(iso + 'Z');
+        var utc = new Date(temp.toLocaleString('en-US', { timeZone: 'UTC' }));
+        var local = new Date(temp.toLocaleString('en-US', { timeZone: TIMEZONE }));
+        var offMin = (local - utc) / 60000;
+        var sign = offMin >= 0 ? '+' : '-';
+        var h = String(Math.floor(Math.abs(offMin) / 60)).padStart(2, '0');
+        var m = String(Math.abs(offMin) % 60).padStart(2, '0');
+        return iso + sign + h + ':' + m;
     },
 
     fmtDT: function(iso) {