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setcookie function returning blank alert after clearing history on computer

I am working on some cookie functions and had my setCookie function working properly and had set it to display when Set Cookie button was clicked. I cleared my history on my computer when I was trying to get my get cookies function working -now all I am getting is a blank alert - can someone please help ?
function setCookie(cname, cvalue, exdays) {
var d = new Date();
d.setTime(d.getTime() + (exdays*24*60*60*1000));
var expires = "expires="+ d.toUTCString();
document.cookie = cname + "=" + encodeURIComponent(cvalue) + ";" + expires + ";path=/";
alert("cookie is working");
}
function getCookieTable() {
alert("test2");
var table =document.getElementById('tg-LTO9U');
var rowLength = table.rows.length;
var columnLength = table.rows[0].cells.length;
var Cookiedata = '';
alert("test3");
for(var i=0;i<rowLength;i++){
for (var j=0; j<table.rows[i].cells.length; j++) {
Cookiedata += table.rows[i].cells[j].innerHTML + ",";
}
}
Cookiedata = rowLength + "," + columnLength + "," + Cookiedata.substring(0, Cookiedata.length);
setCookie("myCookie", Cookiedata, 7);
alert(document.cookie);
}

is it a correct method to set a cookie funtion?

I was wondering if following function is a proper way of setting new cookie.
function setCookie()
{
var value='tackoverhide';
var now = new Date();
var time = now.getTime();
time += 3600 * 1000;
now.setTime(time);
document.cookie ='tackoverhide='+ value +'; expires=' + now.toUTCString() + '; path=/';
}

Here's the code snippet for setting cookie using JavaScript. It's almost the same as your function without minor mistakes.
function setCookie() {
var name = 'tackoverhide';
var value = 'tackoverhide';
var d = new Date();
var hours = 1;
d.setTime(d.getTime() + (hours*60*60*1000));
var expires = "expires="+d.toUTCString();
document.cookie = name + "=" + value + "; " + expires;
}

Can't able to set expiry date in cookie using javascript?

I am using following function
function setCookie(c_name,value,exdays){
var exdate=new Date();
exdate.setDate(exdate.getDate() + exdays);
var c_value=escape(value) + ((exdays==null) ? "" : "; expires="+exdate.toUTCString());
document.cookie=c_name + "=" + c_value;
}
setCookie("userName","vimalraj.s",1);
It create cookies in a "session " not with a 24 hours expiry time .
how to fix this ?
UPDATE :
The above code works fine in my colleague's computer Firefox(27.0.1)
and it doesn't for me same Firefox version
I even tried "max-age" instead of "expires"
function set_cookie ( cookie_name, cookie_value,
lifespan_in_days, valid_domain )
{
// http://www.thesitewizard.com/javascripts/cookies.shtml
var domain_string = valid_domain ?
("; domain=" + valid_domain) : '' ;
document.cookie = cookie_name +
"=" + encodeURIComponent( cookie_value ) +
"; max-age=" + 60 * 60 *
24 * lifespan_in_days +
"; path=/" + domain_string ;
}
Nothing worked ...

Taken from quirksmode.org.
function createCookie(name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}
else var expires = "";
document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}
function eraseCookie(name) {
createCookie(name,"",-1);
}
Here is for one day
createCookie('ppkcookie','testcookie',1)

I suggest you to create a new cookie with same cookie name.
now you can set the new expire.
This will over ride the existing cookie since both are of same name.
Now the new cookie will have the new expires
old cookie
var d = new Date();
d.setTime(d.getTime()+(exdays*24*60*60*1000));
var expires = "expires="+d.toGMTString();
document.cookie = cname+"="+cvalue+"; "+expires;
new cookie
var d = new Date();
d.setTime(d.getTime()+(exdays*24*60*60*1000));
var expires = "expires="+d.toGMTString();
document.cookie = cname+"="+cvalue+"; "+expires;
I hope this will help

Set Expiration on end of the day

I'm trying to set a cookie that will expire at the end of the day. I've create this function :
function mnc(cname,cvalue)
{
var now = new Date();
var expire = new Date();
expire.setFullYear(now.getFullYear());
expire.setMonth(now.getMonth());
expire.setDate(now.getDate()+1);
expire.setHours(0);
expire.setMinutes(0);
//alert(expire.toGMTString() + " " + expire.toString());
var expires = "expires="+expire.toString();
alert(expires + "=> now =" + now);
document.cookie = cname + "=" + cvalue + "; " + expires +"; path=/";
}
On Fiddle : http://jsfiddle.net/MYs6b/
So, the alert box show me the good expiration date.
But, if I change the date on my computer by adding 1 or 100 days, i still have the same value in the cookie.
Why? I'm searching since 3 hours and i don't understand...
EDIT :
I've had an alert on "document.cookie" is empty
http://jsfiddle.net/MYs6b/2/
EDIT 2 :
I've add a better example of my problem. It's working on IE and FF but not on chrome :
http://jsfiddle.net/5h87M/1/

Try This: http://jsfiddle.net/MYs6b/1/
function mnc(cname,cvalue)
{
var now = new Date();
var expire = new Date();
expire.setFullYear(now.getFullYear());
expire.setMonth(now.getMonth());
expire.setDate(now.getDate()+1);
expire.setHours(0);
expire.setMinutes(0);
expire.setSeconds(0);
var expires = "expires="+expire.toString();
alert(expires + "=> now =" + now);
document.cookie = cname + "=" + cvalue + "; " + expires +"; path=/";
}
mnc("test", "123456");

Last update of chrome correcting this issue.

function createCookie(name,value,path) {
var expires = "";
var date = new Date();
var midnight = new Date(date.getFullYear(), date.getMonth(), date.getDate(), 23, 59, 59);
expires = "; expires=" + midnight.toGMTString();
if (!path) {
path = "/";
}
document.cookie = name + "=" + value + expires + "; path=" + path;
}

Trying to create cookies in JavaScript

I am trying to save cookies in JavaScript and then display them on the page again but for some reason my setCookies function and displayCookies function is not working properly.. I want it to also expire after 1 week. It is coming from a form and when I put it in Web Developer in FireFox it says Reference Error setCookies and displayCookies is not defined. My jsfiddle is : http://jsfiddle.net/FmXJW/
function setCookies()
{
// this function will set cookies for each field in the reservation form, and set them to expire after one day
var Name = document.forms[0].txtName.value;
var Address = document.forms[0].txtAddress.value;
var City = document.forms[0].txtCity.value;
var State = document.forms[0].txtState.value;
var Zip = document.forms[0].txtZip.value;
var Email = document.forms[0].txtEmail.value;
var CarType = document.forms[0].txtCarType.value;
var PickupDate = document.forms[0].txtPickupDate.value;
var ReturnDate = document.forms[0].txtReturnDate.value;
var myDate = newDate();
myDate.setDate(myDate.getDate() + 7);
document.cookie = "name=" + encodeURIComponent(Name) + "; expires=" + myDate.toUTCString();
document.cookie = "address=" + encodeURIComponent(Address) + "; expires=" + myDate.toUTCString();
document.cookie = "city=" + encodeURIComponent(City) + "; expires=" + myDate.toUTCString();
document.cookie = "state=" + encodeURIComponent(State) + "; expires=" + myDate.toUTCString();
document.cookie = "zip=" + encodeURIComponent(Zip) + "; expires=" + myDate.toUTCString();
document.cookie = "email=" + encodeURIComponent(Email) + "; expires=" + myDate.toUTCString();
document.cookie = "carType=" + encodeURIComponent(CarType) + "; expires=" + myDate.toUTCString();
document.cookie = "pickupDate=" + encodeURIComponent(PickupDate) + "; expires=" + myDate.toUTCString();
document.cookie = "returnDate=" + encodeURIComponent(ReturnDate) + "; expires=" + myDate.toUTCString();
window.alert ("Your reservation has been saved.");
} // end function setCookies()
function displayCookies()
{
// this function will read the saved cookies, and repopulate the form with the cookie values
var cookieString = decodeURIComponent(document.cookie);
var cookieArray = cookieString.split("; ");
if (document.cookie == 0)
{
alert("You have not made a reservation");
}
else
{
// retrieve each cookie, and display the cookie value in the appropriate form field
document.forms[0].txtName.value = cookieArray[0].lastIndexOf("=") + 1);
document.forms[0].txtAddress.value = cookieArray[1].lastIndexOf("=") + 1);
document.forms[0].txtCity.value = cookieArray[2].lastIndexOf("=") + 1);
document.forms[0].txtState.value = cookieArray[3].lastIndexOf("=") + 1);
document.forms[0].txtZip.value = cookieArray[4].lastIndexOf("=") + 1);
document.forms[0].txtEmail.value = cookieArray[5].lastIndexOf("=") + 1);
document.forms[0].txtCarType.value = cookieArray[6].lastIndexOf("=") + 1);
document.forms[0].txtPickupDate.value = cookieArray[7].lastIndexOf("=") + 1);
document.forms[0].txtReturnDate.value = cookieArray[8].lastIndexOf("=") + 1);
}
} // end function displayCookies()

You have a couple of problems on your code:
You are not retrieving the value from the different fields stored on the cookie correctly, you need to use slice to get the right part.
I also guess the line var myDate = newDate(); should be var myDate = new Date();.
I have changed your fiddle (find it here) and loaded the code in <head> and now it seems to save and display the cookies correctly.