diff --git a/fhem/www/pgm2/fhemweb.js b/fhem/www/pgm2/fhemweb.js
index 83c6794b7..134a6c175 100644
--- a/fhem/www/pgm2/fhemweb.js
+++ b/fhem/www/pgm2/fhemweb.js
@@ -41,9 +41,12 @@ FW_doUpdate()
             if(el.options[j].value == d[2]) {
               el.selectedIndex = j;
             }
-      } else {
 
+      } else {
         el.innerHTML=d[2];
+        if(d[0].indexOf("-") >= 0)  // readings / timestamps
+          el.setAttribute('class', 'changed');
+
       }
     }
   }
diff --git a/fhem/www/pgm2/style.css b/fhem/www/pgm2/style.css
index 7f72b28cb..93abb749a 100644
--- a/fhem/www/pgm2/style.css
+++ b/fhem/www/pgm2/style.css
@@ -39,6 +39,7 @@ select {  margin-left:5px; margin-right:5px; }
 .set .slider { background:#F0F0D8; border-radius:8px; }
 /* timepicker */
 .set .set { margin-bottom:2px; margin-top:3px; }
+.changed { color:red; }
 
 .handle { position:relative; cursor:pointer; width:50px;
           height:20px; line-height:20px; user-select:none;