JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://momentjs.com/downloads/moment.min.js"></script>

JavaScript

moment.lang('en-custom', {
    week: {
        dow: 1,
        doy: 6 // Adjust the first week of the year, depends on the country. For the US it's 6. For the UK, 4.
    }
});

var date = '2014-03-24';

console.log('next start', moment(date).weekday(7).format('DD/MM/YYYY')); 
console.log('next end', moment(date).weekday(13).format('DD/MM/YYYY')); 

console.log('prev start', moment(date).weekday(-7).format('DD/MM/YYYY')); 
console.log('prev end', moment(date).weekday(-1).format('DD/MM/YYYY')); 

console.log('current start', moment(date).weekday(0).format('DD/MM/YYYY')); 
console.log('current end', moment(date).weekday(6).format('DD/MM/YYYY'));