Sure, it's not built into DW though.
Here's a javascript that would do the trick. Copy this part into a new .js file and call it "date.js"...
months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
var d = new Date();
var weekday = new Array(7);
weekday[0] = "Sunday";
weekday[1] = "Monday";
weekday[2] = "Tuesday";
weekday[3] = "Wednesday";
weekday[4] = "Thursday";
weekday[5] = "Friday";
weekday[6] = "Saturday";
var d = new Date();
(d.getFullYear());
var theDate = new Date(document.lastModified);
theDate.setTime((theDate.getTime()+(60*60)) )
with (theDate) {
document.write("<i>Last updated "+weekday[getDay()]+' '+months[getMonth()]+' '+getDate()+', '+d.getFullYear()+' @ '+getHours()+':'+getMinutes()+" DST</i>")
}
Here's a base html page that attaches to the date.js file. Place the bold part wherever you want the date to show in your page and make sure the "path-to" part is the actual path to your .js file...
<!doctype html>
<html lang="en-us">
<head>
<meta charset="utf-8">
<title>Add date from Last Modified of document</title>
</head>
<body>
<script src="path-to/date.js" script type="text/javascript"></script>
</body>
</html>