js cookies don't work to show message 1 time?

Question

JavaScript

Good evening, the library is connected

https://cdn.jsdelivr.net/npm/[email protected]/src/js.cookie.min.js

and popup script:

function diplay_hide (blockId)
{ 
    if(!Cookies.get("checker")) {
        Cookies.set('checker', 'value', { expires: 30 });
        $(blockId).animate({height: 'show'}, 500);
    } else {     
        $(blockId).animate({height: 'hide'}, 500); 
    }
}

and the popup itself:

<div class="personal-data" id="block_id"><div class="personal-data-warning">ТЕКСТ<a class="close"  onclick="diplay_hide('#block_id');return false;" id="setCookie" ></a></div></div>

It does not give any errors, but it does not work either, when the page is reloaded, the window appears again.

Answer 1

What does expires: 30 mean? I suspect that the time in milliseconds is transferred there, or the time elapsed since 01/01/1970, in which case your cookie almost instantly goes rotten or comes already rotten.