One month in Custom Range Validation for daterangepicker

Here is the code for One month in Custom Range Validation for daterangepicker:

$('#reportrange').daterangepicker({
    startDate: start,
    endDate: end,
    ranges: {
       'Last 7 Days': [moment().subtract(6, 'days'), moment()],
       'Last 30 Days': [moment().subtract(29, 'days'), moment()],
       'This Month': [moment().startOf('month'), moment().endOf('month')],
       'Last Month': [moment().subtract(1, 'month').startOf('month'), 
     moment().subtract(1, 'month').endOf('month')]
    },
    "dateLimit": {
            "month": 1
        },
 }, cb);