diff --git a/js/utime.js b/js/utime.js
index fa6e7e1..7b211c6 100644
--- a/js/utime.js
+++ b/js/utime.js
@@ -47,6 +47,7 @@ Utime.prototype = {
     convertTimestamp: function(input) {
         var output = '',
             date;
+        var outputtext = '';
 
         if(!input || input === '') {
             return output;
@@ -58,7 +59,12 @@ Utime.prototype = {
             return false;
         }
 
-        if(this.getOption('timestampUnit') === 's') {
+        if(input >= 100000000000000){
+            outputtext = "<i>Assuming that this timestamp is in microseconds (1/1,000,000 second)</i>";  
+            input=Math.round(input/1000);
+        }else if(input >= 100000000000){
+            outputtext = "<i>Assuming that this timestamp is in milliseconds</i>";   
+        }else{
             input = input * 1000;
         }
 
@@ -76,7 +82,7 @@ Utime.prototype = {
                 output += ' ' + date.toString(this.getOption('timeOutputFormat'));
             }
         }
-        
+        $("#message-container").html(outputtext);
         return output;
     },
 
diff --git a/popup.html b/popup.html
index 12ffbe4..de571cf 100644
--- a/popup.html
+++ b/popup.html
@@ -12,6 +12,7 @@
                         </div>
                         <div class="input-group-field">
                             <input type="text" class="input-group-control input-1" />
+                            <div id="message-container"></div>
                         </div>
                     </div>
                 </div>