JSFiddle - React, Tailwind, and code Playground

HTML

<div class="content"></div>

JavaScript

var loopTest = {
    Test1: {
        date: ['November 2011', 'a new date']
    },

    Test2: {
        date: 'January 2012'
    }
};

for (var key in loopTest) {
    [].concat(loopTest[key].date).forEach(function(date) {
        $('.content').append('- ' + date + '<br />');
    });
}