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Persistent cookie being deleted as soon as Safari is closed and reopened (working fine in Chrome, Firefox)

I'm using the following JavaScript code to store a cookie with a ID in the browser of the website visitor for 60 days.
While it is working perfectly in Chrome, Firefox etc. in Safari the cookie disappears after closing and reopening the browser. (happens with iPhones, Macbooks etc., even in the standard cookie-configuration)
function setCookie() {
const date = new Date;
date.setDate(date.getDate() + 60);
var uid = Date.now().toString(36) + Math.random().toString(36).substring(2);
document.cookie = "ck=" + uid + "; expires=" + date + "; path=/";
}
Does anyone have an idea, why this could be happening? Greetings!

I decided to set and read the cookie with php, now it is working. Maybe that is the better option anyways, since cookies set with document.cookie can only last maximum 7 days in Safari, before they get automatically deleted
(according to this overview)

Create Constant Cookie

The situation is the next: We have a site that have a lot of domains:.pl,de,com,se... This domeins are only on home page and landing pages. After you make search it is redirecting it on .com domain. So all domains become COM. I need something to create in Google Tag Manager that will remember the first domain (pl,de,com,se and annother) and will hold that information for all the path. So if I will have such information I could exactly indicate to my Adwords tracking codes which code has to fire. I am working with cookies in Google Tag Manager. How to create the cookie that will change only in the situation when the tag with the cookie will fire. I need the cookie that holds the information from one page - not changing with the new page. The code I use is:
<script>
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=/";
}
createCookie("DomainCookie",{{Page URL}})
</script>

Where does cookies get stored by office word add-in on mac

i have stored the data in cookies by office task pane word add-in. to store the data in cookies i have used the following function.
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 + "=" + cvalue + "; " + expires;
}
This function stores the data. But when i'm trying to clear the cookies it doen't get cleared. I have cleared the history and delete the cookies of safari browser, i have cleared the cache and cookies at location ~/Library/caches and ~/Library/cookies but still cookies are not cleared. If anyone know the exact location where the cookies get stored, please let me know.
Thanks in advance.

Had a similar problem with Excel add-in.
Unlike JavaScript add-in on Windows, on Mac every time user closes the task pane, the embedded browser clears everything, including localStorage and Cookies.
A work around we came up with is to persist data to cells in a hidden sheet, but it should never be used for authentication.

I do not know where cookies are stored, but you can clear the cookies using this code:
var cookies = document.cookie.split(";");
for (var i = 0; i < cookies.length; i++) {
var cookieName = cookies[i].split("=")[0];
document.cookie = cookieName + "=;";
}

You can try to clear Internet explorer cookies as it use this browser internally.

Clear the Internet history and cookies for INTERNET EXPLORER. This should solve the issue.

document.cookie is still accessible on IE11, even though cookies are disabled

Using IE11, I can display the content of all cookies, write out a cookie, find it, and delete it using JavaScript, even though I have my Privacy set to "Block All Cookies". (And actually, no matter what version I set my IE emulation to, the document.cookie still works.) It works as it should on Chrome with cookies disabled - i.e. document.cookie returns empty/nothing when I try to reference it in the same JavaScript.
I'm trying to detect whether the user has cookies turned off in their IE. (Old ASP app that requires IE with cookies. No JQuery. No Modernizr.) To do that, I'm attempting to write out a cookie, find it, and then delete it. That either works or it doesn't - which should tell me whether cookies are turned ON or OFF. Any ideas? I thought this was the safest way to detect a user's IE cookie setting.
My code:
<script language=javascript>
cookiesON = false;
if ("cookie" in document ) {
alert("1. document.cookie (before add): " + document.cookie);
var dateNow = new Date();
document.cookie = "testcookie=" + new Date()
alert("2. document.cookie (after add): " + document.cookie);
if (document.cookie.indexOf("testcookie=") > -1) {
cookiesON = true;
} else {
cookiesON = false;
}
// delete cookie: set cookie to expire 2 minutes ago
document.cookie="testcookie=xx; expires=" + (new Date(dateNow.getTime() - 2*60000).toGMTString());
alert("3. document.cookie (after delete): " + document.cookie);
}
On IE:
All 3 alerts show values for document.cookie, no matter whether cookies are turned on or off. You can see the testcookie being added and deleted back off.
On Chrome:
All 3 alerts show blank for document.cookie when cookies are off. Works as described for IE when cookies are turned on.

Issue with cookie, cookie is lost after closing browser

I've created a cookie like below and can retrieve all font_size, back_color and font_name. But once I close the browser the cookie is lost. From what I know is if we get expiry date wrong cookie can be lost but I've tested the date, expireGMT and is fine. Have I done anything wrong in the code below? Do I need to include path as well?
document.cookie = "font_size=14";
document.cookie = "back_color=Gray";
document.cookie = "font_name=Georgia";
document.cookie = "expires=" + expireGMT;

Each individual write to document.cookie is the setting of a cookie, and any options (including that cookie's expiration date) must be set on that write. You need to include the expiring time on every cookie assignment:
document.cookie = "font_size=14; expires=" + expireGMT;
document.cookie = "back_color=Gray; expires=" + expireGMT;
document.cookie = "font_name=Georgia; expires=" + expireGMT;
without that, each cookie will be created as session cookies and expire when the browser's closed.