Using XLSX library

UsingXLSX.js

// reading workbook from binary contents
var workbook = XLSX.read(excelBinaryContents, {type: 'binary'});

// retrieve properties of workbook (will be needed later)
var wbProps = workbook.Workbook.WBProps;

// get any particular worksheet by name
var worksheet = workbook.Sheets['Work Sheet Name'];

// get any cell
var cell = wrkSheet['A1'];

// reading number column could look as follows:
var parsed = parseFloat(cell.v);

// the most interesting is retrieving dates from Excel
var momentDate = this.parseExcelDate(cell.v, wbProps);

// and the function itself
parseExcelDate: function (dateValue, wbProps) {
  if(dateValue) {
    // it is a string, but it really represents a number and not a date
    if(typeof dateValue === 'string' && /^\d+$/.test(dateValue)) {
      dateValue = parseFloat(dateValue);
    }
    if(typeof dateValue === 'number') {
      var dt = XLSX.SSF.parse_date_code(dateValue, {date1904: wbProps.date1904 === '1'});
      // new Date(2015, 9, 18);  // 18th October(!) 2015 in @JavaScript
      var monthToJs = dt.m - 1;
      return moment(new Date(dt.y, monthToJs, dt.d));
    }
    // else assume a string representing a date
    // we use few allowed formats, but explicitly parse not strictly
    var formats = ['YYYY-MM-DD', 'DD-MM-YYYY', 'MM/DD/YYYY'];
    return moment(dateValue, formats, false);
  }
  return null;
},