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Cookie persistence in iOS Safari/Chrome

My persistent cookies are being deleted when I close and reopen the browser on iOS Safari (and Chrome). I'm on iOS 11, but have tested on iOS10/9 also. The cookies persist correctly on Android and desktop. And strangely, it works fine for Firefox on iOS.
What am i missing here?
Here is my javascript code the sets the cookie and expire date:
setCookie = function(cname, cvalue, exdays) {
var d = new Date();
d.setTime(d.getTime() + (exdays*24*60*60*1000));
var expires = "expires="+ d.toUTCString();
document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
}
setCookie("test", "random test value", 365);

I've just come across this problem with cookies being persistent on Android / Desktop devices but not on iOS11 when tested on a production server. The solution seemed to be defining the domain of the cookie:
setCookie = function(cname, cvalue, exdays) {
var d = new Date();
d.setTime(d.getTime() + (exdays*24*60*60*1000));
var expires = "expires="+ d.toUTCString();
document.cookie = cname + "=" + cvalue + ";" + expires + ";domain=" + window.location.hostname + ";path=/";
}
setCookie("test", "random test value", 365);
iOS11 seems to be much more locked down in terms of what cookies it accepts. I can find lots of marketing blurb about it being better for privacy but very little technical detail about how to implement things (e.g. persistent login / SSO) properly in light of the new restrictions. Can anyone recommend any useful links?

jQuery cookie plugin: Setting a cookie for a year and after closing browser and re-opening - the cookie is gone

I am trying to save a cookie using jQuery Cookie Plugin.
setting this for a year this way:
// Set a flag
jQuery.cookie('coo_flag', 1, { expires : 365, path:'/' });
Getting me this result:
Clearly stating that the cookie is expiring next year from the day it has been created.
When I close the browser and reopen it, the cookie disappears (together with all cookies saved that way).
Any idea why this is happening?
Running this on a Wordpress website.
Tested on Chrome and FireFox web browsers.

If you cannot find any browser settings preventing this, perhaps trying it using plain old vanilla javascript, just to see if that works, so something like this:
function setCookie(sName, sValue, nDays) {
var expires = "";
if (nDays) {
var d = new Date();
d.setTime(d.getTime() + nDays * 24 * 60 * 60 * 1000);
expires = "; expires=" + d.toGMTString();
}
document.cookie = sName + "=" + sValue + expires + "; path=/";
}

Can't set new google translate cookie value on iOS devices

I am making a prototype and a big part of the site is being presented in different languages. I found this video which worked beautifully on my desktop browsers and android device. But when trying it on my iOS devices (with Safari and chrome) the cookie "googtrans" can only be set once then it keeps that value. Here is the code setting the cookie:
$(".lang-selections li").click(function(){
switch(this.id) {
case ("langEng"):
$.cookie("googtrans", "/en/en");
location.reload(false);
break;
case ("langNor"):
$.cookie("googtrans", "/en/no");
location.reload(false);
break;
case ("langSwe"):
$.cookie("googtrans", "/en/sv");
location.reload(false);
break;
case ("langDan"):
$.cookie("googtrans", "/en/da");
location.reload(false);
break;
default:
$.cookie("googtrans", "/en/en");
}
})
Thanks in advance for the help!
/Manfred

In google chrome there are two cookie generate for googtrans so while create that you must set both of these with domain.Here i set cookie by javascript also set by jQuery also.
function ChnageLang(value)//This function call when dropdown menu changes
{
createCookie('googtrans','/auto/'+value,1,'');//generate cookie path www.mydomain.com
createCookie('googtrans','/auto/'+value,1,'mydomain.com');//generate cookie path .mydomain.com
}
function createCookie(name, value, days, domain){
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 + "; domain=" + domain + "; path=/";
}

Cookie not expiring in IE

In every other tested browser (safari, firefox, chrome, opera) the cookie is alive when user is on page and when the browser or tab is closed or the cookie expires after 5 seconds. In IE it only expires when closing IE completely but not when just closing a tab.
Any suggestions on how to fix this?
<p id="demo"></p>
<script type="text/javascript">
if (/(^|;)\s*testcookie=/.test(document.cookie)) {
document.getElementById("demo").innerHTML = "hello again user";
var myVar=setInterval(function(){document.cookie = "testcookie=true; max-age=" + 5 * 1 + ";path=/"},1000);
} else {
var myVar=setInterval(function(){document.cookie = "testcookie=true; max-age=" + 5 * 1 + ";path=/"},1000);
document.getElementById("demo").innerHTML = "welcome new user";
}
</script>
A jsfiddle for thos who want that: http://jsfiddle.net/JkceP/
Kind regards
Johan

javascript delete cookie works bizarre across browser

I'm trying to do a demo test on javascript cookie. Please find the code below which I wrote for testing.
<html>
<head>
<script type='text/javascript' >
function setcookie()
{
alert("check if cookie avail:" +document.cookie.split(';'));
var dt=new Date();
document.cookie='name=test';
document.cookie='expires='+dt.toUTCString()+';'
alert("now cookie val:" +document.cookie.split(';'));
dt.setDate(dt.getDate()-1);
document.cookie = "expires=" + dt.toUTCString() + ";"
alert("after deletion cookie val:" + document.cookie.split(';'));
}
</script>
</head>
<body>
<input id='txt' onchange='setcookie()' />
</body>
</html>
The code will work as,
Initally, this will display the cookie which is present already in that browser, then I try to set a cookie as 'name=test' with 1day expire time. Using alert I can see the value set in that cookie. In the next line, I try to delete cookie by setting expire date to current date-1. If I use alert to print the cookie value, cookie is displayed with expire date as currentdate-1.
My questions is,
In Mozilla, If I refresh the browser and try to do the same step then the first alert displays the cookie value with expire time as currentdate-1. Why Im getting cookie value even if i delete at the last line of my script. However, once I close the browser the cookie value is empty. Why it is so?
In chrome, If I run the same piece of code, neither of the cookie is set. Why Im not able to set cookie in chrome browsers.
Please tel me why such difference occuring across browsers.

This is not setting the expiry
document.cookie='name=test';
document.cookie='expires='+dt.toUTCString()+';'
this is
document.cookie='name=test; expires='+dt.toUTCString()+';'
The best is to take well tested cookie code and use that
Try this one or use a jQuery plugin if you use jQuery
// cookie.js file
var daysToKeep = 14; // default cookie life...
var today = new Date();
var expiryDate = new Date(today.getTime() + (daysToKeep * 86400000));
/* Cookie functions originally by Bill Dortsch */
function setCookie (name,value,expires,path,theDomain,secure) {
value = escape(value);
var theCookie = name + "=" + value +
((expires) ? "; expires=" + expires.toGMTString() : "") +
((path) ? "; path=" + path : "") +
((theDomain) ? "; domain=" + theDomain : "") +
((secure) ? "; secure" : "");
document.cookie = theCookie;
}
function getCookie(Name) {
var search = Name + "="
if (document.cookie.length > 0) { // if there are any cookies
var offset = document.cookie.indexOf(search)
if (offset != -1) { // if cookie exists
offset += search.length
// set index of beginning of value
var end = document.cookie.indexOf(";", offset)
// set index of end of cookie value
if (end == -1) end = document.cookie.length
return unescape(document.cookie.substring(offset, end))
}
}
}
function delCookie(name,path,domain) {
if (getCookie(name)) document.cookie = name + "=" +
((path) ? ";path=" + path : "") +
((domain) ? ";domain=" + domain : "") +
";expires=Thu, 01-Jan-70 00:00:01 GMT";
}