Parse an Octopus deployment and determine duration of each step

parser.js

var dateItems = [].slice.call(document.querySelectorAll('.log-date span'));

var dates = dateItems.map(function (item) {
    return { span: item, date: Date.parse(item.getAttribute('title')) };
}).map(function (item, index, arr) {
    var next = arr[index + 1] || item;
    return {
        span: item.span,
        date: item.date,
        next: next
    };
}).map(function (item) {
    return 'Took ' + moment(item.next.date).diff(item.date, 'seconds') + 's';
});

console.log(dates);