Adds a tooltip to the 'modified'/'answered' parts of questions on the homepage that tells you when the question was asked.

add-asked-date-tooltip.user.js

// ==UserScript==
// @name         Get asked date
// @namespace    http://stackexchange.com/users/4337810/
// @version      1.0
// @description  Adds a tooltip to the 'modified'/'answered' parts of questions on the homepage that tells you when the question was asked.
// @author       ᔕᖺᘎᕊ (http://stackexchange.com/users/4337810/)
// @match        *://*.stackexchange.com/*
// @match        *://*.stackoverflow.com/*
// @match        *://*.superuser.com/*
// @match        *://*.serverfault.com/*
// @match        *://*.askubuntu.com/*
// @match        *://*.stackapps.com/*
// @match        *://*.mathoverflow.net/*
// @grant        none
// ==/UserScript==

function getDate(url, $that) {
    $.get(url, function(responseText, textStatus, XMLHttpRequest) {
        $that.find('.shub-asked-date').attr('title', $(XMLHttpRequest.responseText).find('#question > table > tbody > tr:nth-child(1) > td.postcell > div > table > tbody > tr > td.post-signature.owner > div > div.user-action-time').text().trim());
    });
}

$('.started').each(function() {
    $that = $(this);
    $(this).find('a:eq(0)').wrapInner("<span class='shub-asked-date'></span>");
    getDate($(this).parent().parent().find('h3 a').attr('href'), $that);
});

http://meta.stackexchange.com/a/261242/260841