Unique URL for list and detail page

It's for a series of images to form a gallery page that ideally wants a unique URL to view/share a single image on (it's not a pop up gallery)

Something like this gallery_details.html...

<h1><perch:content id="title" type="text" label="Picture Name" required="true" title="true" size="xl" /></h1>
<perch:content id="image" type="image" label="Image" width="640" output="tag" />
<perch:content id="desc" type="text" label="Short Description" required="true" size="xl" />
<perch:content id="slug" for="title" type="slug" suppress="true" />
<perch:content id="image" type="image" label="Image" width="100" height="100" crop="true" suppress="true" />

Then there's a feed of the recently added image thumbnails on the home page. Clicking on one will take you to the unique URL. All doable except for the editor making duplicates.

Could I add a date/time to the end of the slug?

If I could add the date/time to the end of the id="title" type="text" label="Picture Name" slug or perhaps add id="desc" to the end of the slug either could reduce/stop duplicates

But how do I join two id's / fields to make the combined slug URL?

<perch:before>
<ul>
</perch:before>
<li>
     <a href="?s=<perch:content id="slug" type="slug" />">
          <perch:content id="image" type="image" width="100" height="100" crop="true" output="tag" />
          <perch:content id="title" type="text" />
     </a>
</li>
<perch:after>
</ul>
</perch:after>

do you mean...

for="title desc"

or

for="title date"

Ok thanks. Could you get a timestamp?