Extract Date and Time Stamp of a file/image

Eureka ! I found how to obtain a date with Opera ...
To avoid that the browser tries to read the image lastModified in the cache, you have only to call

Code:

---

dt=LastModUsingHeader('upload.jpg?'+Math.random());
// or to modify the function
function LastModUsingHeader(U) {
    var X = !window.XMLHttpRequest ? new ActiveXObject('Microsoft.XMLHTTP') : new XMLHttpRequest;
    X.open('GET', U+'?'+Math.random(), false);
          try{ X.send();}catch(y){}
          var dt=X.getResponseHeader('Last-Modified');
        return new Date(dt).toLocaletring();
}
// to write
<p>Image uploaded: <i id="ImageDate"></i></p>

<script type="text/javascript">
document.getElementById('ImageDate').innerHTML=LastModUsingHeader('upload.jpg');
</script>

---

This could be applied too to the image src...
It would be better to have a DOCTYPE for the page (See W3C) and to display meta tags to control the cache (See this page) to choose a Meta tag...

HTML Code:

---

<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
<META HTTP-EQUIV="PRAGMA" CONTENT="NO-CACHE">

---

Otherwise the users could have difficulties to update the page...

Thanks to all!

This is the code I'm using and it seems to work for Opera, Firefox and IE. The date/time stamp of a file shows up correctly at local time:

Code:

---


<p>Image uploaded: <i id="getImageDate"></i></p>

<script type="text/javascript">
function LastModUsingHeader(sFile) {
        var X = !window.XMLHttpRequest ? new ActiveXObject('Microsoft.XMLHTTP') : new XMLHttpRequest;
    X.open('GET', sFile, false);
          try{ X.send();}
        catch(y){}
          var dtImage=new Date();
        dtImage = X.getResponseHeader('Last-Modified');
        return new Date(dtImage).toLocaleString();
}

document.getElementById('getImageDate').innerHTML=LastModUsingHeader('upload.jpg'); ;
       
</script>

---

It's could be better to call (See for example this page)

Code:

---

document.getElementById('getImageDate').innerHTML=LastModUsingHeader('upload.jpg?avoidCache='+Math.random()));

---

For me it's do not work with Opera without this addition.