PHP cookie not set within AJAX call

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Apparently I was missing the time() attribute.
So when adding this to the expire option in the setCookie function, the cookie is being set.

Code:

setcookie('user-zipcode', $zipcode, time() + MONTH_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN);
setcookie('delivery-today', $cookieVal, time() + DAY_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN);