title: How to display 0 minute as '00:00' in moment.js?
body: <p>I would like to display 0 minute in <code>'HH:mm'</code> format. When I use <code>moment.duration(0, 'minutes').format('HH:mm')</code> it returns <code>'00'</code> instead of <code>'00:00'</code>. Is there a format type in moment.js which displays 0 minute as <code>'00:00'</code>?</p>