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ferry- / autotest time offset

// ==UserScript==
// @name         autotest time offset
// @namespace    arista
// @version      0.1
// @description  display test start time in local time/date
// @author       You
// @match        http://autotest/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    function pad_leading_zeros(str, len) {
        if (!(str instanceof String)) {
            str = String(str);
        }
        while (str.length < len) {
            str = '0' + str;
        }
        return str;
    }

    var tbs = document.getElementsByTagName("tbody");
    var tb = null;

    var e, i, j;
    for (i = 0; i < tbs.length; i++) {
        var t = tbs.item(i);
        var tr0 = t.firstElementChild;
        var tcn0 = tr0.children[0];
        var tcn1 = tr0.children[1];
        if ((tcn0.tagName === "th" || tcn0.tagName === "TH") && tcn0.textContent === "Change" &&
            (tcn1.tagName === "th" || tcn1.tagName === "TH") && tcn1.textContent === "Id") {
            tb = t;
            break;
        }
    }

    var time_reg = /^\s*(\d\d)\/(\d\d)\s+(\d\d):(\d\d)\s*$/;
    var year = (new Date()).getFullYear();
    var time_offset_src = "-08:00";

    var tou = (new Date()).getTimezoneOffset();
    var time_offset_user = (tou < 0)? '-' : '+';
    tou = Math.abs(tou);
    time_offset_user += pad_leading_zeros((tou / 60).toFixed(), 2);
    time_offset_user += ':' + pad_leading_zeros((tou % 60).toString(10), 2);

    if (tb) {
        var trs = tb.children;
        var th = trs.item(0);
        for (i = 0; i < th.children.length; i++) {
            e = th.children.item(i);
            if (e.textContent === "Start") {
                e.textContent = "Start (Local)";
            }
        }

        for (i = 1; i < trs.length; i++) {
            var tr = trs.item(i);
            var se = null;
            var sm = null;

            for (j = 0; j < tr.children.length; j++) {
                e = tr.children.item(j);
                var text = e.textContent;
                sm = text.match(time_reg);
                if (sm) {
                    se = e;
                    break;
                }
            }

            if (se) {
                var month = sm[1];
                var day = sm[2];
                var hour = sm[3];
                var minute = sm[4];
                //YYYY-MM-DDThh:mmTZD
                var utc = new Date(year.toString(10) + '-' + month + '-' + day + 'T' + hour + ':' + minute + time_offset_src);
                var local_time = pad_leading_zeros(utc.getMonth()+1, 2) + '/' + pad_leading_zeros(utc.getDate(), 2);
                local_time += ' ' + pad_leading_zeros(utc.getHours(), 2) + ':' + pad_leading_zeros(utc.getMinutes(), 2);
                se.textContent += '\n(' + local_time + ')';
            }
        }
    }

})();