diff --git a/wwws/admin/src/testtimestamp.html b/wwws/admin/src/testtimestamp.html
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="UTF-8">
+<title>Test Timestamp</title>
+<script src="https://cdn.jsdelivr.net/npm/dayjs@1/dayjs.min.js"></script>
+</head>
+<body>
+<h1>Test Timestamp avec Day.js</h1>
+<pre id="output"></pre>
+
+<script>
+(function(){
+  const output = document.getElementById("output");
+
+  function log(...args) {
+    console.log(...args);
+    output.textContent += args.join(" ") + "\n";
+  }
+
+  // Timestamp avec dayjs
+  const tsNow = dayjs().valueOf();
+  log("Timestamp dayjs().valueOf():", tsNow);
+
+  // Timestamp Date.now()
+  const tsSystem = Date.now();
+  log("Timestamp Date.now():", tsSystem);
+
+  // Différence
+  log("Différence (ms) :", tsNow - tsSystem);
+
+  // Conversion en date
+  log("Date locale :", new Date(tsNow).toString());
+  log("Date UTC    :", new Date(tsNow).toUTCString());
+
+  // Vérification simple
+  if (tsNow - tsSystem > 5000 || tsNow - tsSystem < -5000) {
+    log("⚠️ Attention : décalage > 5s entre dayjs() et Date.now()");
+  } else {
+    log("✔ Timestamp cohérent");
+  }
+
+})();
+</script>
+</body>
+</html>
+
+
