JSFiddle - React, Tailwind, and code Playground
HTML
<div id="konsole">
</div>
JavaScript
var ts = '2015-07-31T18:30:00.000Z';
var getBillingMonth = function(s) {
var M = 'January,February,March,April,May,June,July,August,September,October,November,December'.split(',');
var d = s.split('T')[0].split('-');
return M[parseInt(d[1])].substr(0,3) + ' ' + d[0];
};
var konsole = document.getElementById('konsole');
konsole.innerHTML = getBillingMonth(ts);