Get start and end of week with Momentjs

start-end-week.js

// include jquery, momentjs
 
$(function () {
  var m = moment();
  m.lang('es'); // week start on monday
  
  var start = m.startOf('week').format('DD'),
      end = m.endOf('week').format('DD'),
      month = m.endOf('week').format('MMMM'),
      afterMonth = start > end ? ' de '+m.startOf('week').format('MMMM') : '',
      year = m.startOf('week').format('YYYY');
   
  $('#weekDate').text('Semana del '+ start + afterMonth +' al '+ end +' de '+month+', '+year);
});

thanks