This script records the date+time of last visit of the user and displays it once the same user return back to you site / Blog. If this is the first visit for the user, a greeting message is shown.

1.Login to your dashboard--> layout- ->Page Elements

2.Click on 'Add a Gadget' on the sidebar.

3.Select 'HTML/Javascript' and add the code given below and click save.

<script type="text/javascript">
var days = 730; // days until cookie expires = 2 years.
var lastvisit=new Object();
var firstvisitmsg="This is your first visit to this page. Welcome!";
lastvisit.subsequentvisitmsg="Welcome back visitor! Your last visit was on <b>[displaydate]</b>";

lastvisit.getCookie=function(Name){
var re=new RegExp(Name+"=[^;]+", "i");
if (document.cookie.match(re))
return document.cookie.match(re)[0].split("=")[1];
return'';
}

lastvisit.setCookie=function(name, value, days){
var expireDate = new Date();

var expstring=expireDate.setDate(expireDate.getDate()+parseInt(days));
document.cookie = name+"="+value+"; expires="+expireDate.toGMTString()+"; path=/";
}

lastvisit.showmessage = function() {
var wh = new Date();
if (lastvisit.getCookie("visitc") == "") {
lastvisit.setCookie("visitc", wh, days);
document.write(firstvisitmsg);
}

else {
var lv = lastvisit.getCookie("visitc");
var lvp = Date.parse(lv);
var now = new Date();
now.setTime(lvp);
var day = new Array("Sun", "Mon", "Tues", "Wed", "Thur", "Fri", "Sat");
var month = new Array ("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec");
var dd = now.getDate();
var dy = now.getDay();
dy = day[dy];
var mn = now.getMonth();
mn = month[mn];
yy = now.getFullYear();
var hh = now.getHours();
var ampm = "AM";
if (hh >= 12) {ampm = "PM"}
if (hh >12){hh = hh - 12};
if (hh == 0) {hh = 12}
if (hh < 10) {hh = "0" + hh};
var mins = now.getMinutes();
if (mins < 10) {mins = "0"+ mins}
var secs = now.getSeconds();
if (secs < 10) {secs = "0" + secs}
var dispDate = dy + ", " + mn + " " + dd + ", " + yy + " " + hh + ":" + mins + ":" + secs + " " + ampm
document.write(lastvisit.subsequentvisitmsg.replace("\[displaydate\]", dispDate))
}

lastvisit.setCookie("visitc", wh, days);

}

lastvisit.showmessage();
</script>

Onthis blog you can this script just installed beneath Feed count widget