display "last solved days algo" directly in Project Euler

pe.js

// ==UserScript==
// @name        PE days
// @namespace   scturtle
// @include     http://projecteuler.net/*
// @include     https://projecteuler.net/*
// @version     1
// @require    https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js
// @grant none
// ==/UserScript==

(function () {
    if ('Username' == $('table.grid > tbody > tr > th:nth-child(2)').html()) {
        $('th').first().after('<th>days ago</th>');
        $('div.info, a.info').each(function () {
            var days = $(this).children('span').html().match(/\s(\w+)\sday/)[1];
            if (days == 'past') days = 0;
            var color = days <= 60 ? "#D00" : "gray";
            $(this).parent().parent().parent().parent().parent().after(
                '<td style="color:' + color + ';text-align:center;"> ' + days + '</td>'
            )
        })
    }
})();