OGame Retro Better Timers

// ==UserScript==
// @name       OGame Retro Better Timers
// @include    *ogame1304.de/game/index.php?page=b_building*
// @include    *ogame1304.de/game/index.php?page=overview*
// @version    0.1
// ==/UserScript==

(function() {
    'use strict';

    // Introduced by one call to the t and tt functions.
    const SKEW = 1;

    var disableOriginalTimers = function() {
        unsafeWindow.t = function() {};
        unsafeWindow.tt = function() {};
    };

    var msToPrettyTime = function(ms) {
        var seconds = Math.floor(ms / 1000);
        var days = Math.floor(seconds / (24 * 60 * 60));
        seconds %= 24 * 60 * 60;
        var hours = Math.floor(seconds / (60 * 60));
        seconds %= 60 * 60;
        var minutes = Math.floor(seconds / 60);
        seconds %= 60;
        var s = '';
        if (days > 0) {
            s += days + ' d ';
        }
        s += hours;
        s += ':';
        s += minutes < 10 ? '0' + minutes : minutes;
        s += ':';
        s += seconds < 10 ? '0' + seconds : seconds;
        return s;
    };

    var prettyDate = function(date) {
        var now = new Date();
        var s = '';
        s += date.getHours() < 10 ? '0' + date.getHours() : date.getHours();
        s += ':';
        s += date.getMinutes() < 10 ? '0' + date.getMinutes() : date.getMinutes();
        s += ':';
        s += date.getSeconds() < 10 ? '0' + date.getSeconds() : date.getSeconds();
        if (now.getDate() != date.getDate() ||
            now.getMonth() != date.getMonth() ||
            now.getFullYear() != date.getFullYear()) {
            s += ' ' + date.getDate() + '.' + (date.getMonth() + 1) + '.' + date.getFullYear();
        }
        return s;
    };

    var overview = function() {
        var now = Date.now();
        // Collect all elements.
        var elements = [];
        for (var i = 1; ; ++i) {
            var bxx = document.getElementById('bxx' + i);
            if (bxx === null) {
                break;
            }
            elements.push(bxx);
        }
        var bxy = document.getElementById('bxy');
        if (bxy !== null) {
            elements.push(bxy);
        }
        // Calculate end dates and inject them into the titles.
        var ends = [];
        for (var i = 0; i < elements.length; ++i) {
            var element = elements[i];
            var remaining = parseInt(element.title);
            var end = new Date(now);
            end.setSeconds(end.getSeconds() + remaining + SKEW);
            ends.push(end);
            element.title = prettyDate(end);
        }
        // Update counters.
        var update = function() {
            var now = new Date();
            for (var i = 0; i < elements.length; ++i) {
                var remaining = ends[i] - now;
                var element = elements[i];
                if (remaining < 0) {
                    element.innerHTML = '-';
                } else {
                    element.innerHTML = msToPrettyTime(remaining);
                }
            }
        };
        if (elements.length > 0)
            setInterval(update, 1000);
    };

    var buildings = function() {
        if (typeof pp === 'undefined') {
            return;
        }
        var end = new Date();
        end.setSeconds(end.getSeconds() + pp + SKEW);
        var bxx = document.getElementById('bxx');
        var update = function() {
            var remaining = end - new Date();
            var s = '';
            if (remaining < 0) {
                s += 'Finished';
                s += '<br>';
                s += '<a href="index.php?page=b_building&session=' + ps + '&cp=' + pl + '">Continue</a>';
            } else {
                s += '<span title="' + prettyDate(end) + '">' + msToPrettyTime(remaining) + '</span>';
                s += '<br>';
                s += '<a href="index.php?page=b_building&session=' + ps + '&unbau=' + pk + '&cp=' + pl + '">Cancel</a>';
            }
            bxx.innerHTML = s;
        };
        setInterval(update, 1000);
    };

    disableOriginalTimers();
    if (window.location.href.indexOf('overview') > 0) {
        overview();
    } else if (window.location.href.indexOf('b_building') > 0) {
        buildings();
    }
})();