How to remove a cookie by using Javascript?

Question

How to remove the cookie set by

javascript:void(document.cookie=”PREF=ID=20b6e4c2f44943bb:U=4bf292d46faad806:TM=1249677602:LM=1257919388:S=odm0Ys-53ZueXfZG;p         


        

Answer 1

Agreed, @bobince. The official documentation says to use Date.toUTCString() for cookie expiration dates.

I am 95% sure that you must set an expiration date when creating the cookie crumb if you want to force its removal later. A cookie crumb created without an explicit expiration date is a session cookie (crumb) by default, which means that it is not removed until the browser is closed. I recall trying to expire a session cookie to no avail, in the past.

If you do set an expiration date on the cookie crumb in the first place, remember that you can use a variable for the new expiration date.

// assuming a non-session cookie crumb called "someCrumbName" exists:
var now = new Date();
var expirationDate = new Date();
var someValue = "foo";

// set the expiration date to a week ago and delete the cookie
expirationDate.setDate(now.getDate() - 7);
document.cookie = "someCrumbName=" + someValue + ";expires=" + expirationDate.toUTCString();