Save the time - by Js

 

function init()
{
 var arrStr = document.cookie.split("; ");
 var time ;
    for(var i = 0;i < arrStr.length;i ++){
     var temp = arrStr[i].split("=");
     if(temp[0] == "<%=username %>"
    {
     time = unescape(temp[1]);
    }
   }
 var date = new Date();
 var str = "<%=username %>"+"="+escape("<%=date %>"); 
 var ms = 99999999*3600*1000;
 date.setTime(date.getTime() + ms);
 str += "; expires=" + date.toGMTString();
 document.cookie = str;
 document.getElementById("inputTime").value = time;
}