Date in XLS sheet not parsing correctly

user_6472762 0
Viewed 24475

I am trying to read a XLS file using 'XLSX' node-module with a column having dates. After parsing the file what I found is that the dates are of few dates back from that of the dates in the sheet. This is what I a doing.

var workbook = XLSX.readFile(filePath);
var grossPayoutSheet = workbook.Sheets[worksheets[1]];
for (var i in grossPayoutSheet) {
    if (i[0] === "!") continue;
    var col = (!isNaN(parseInt(i.substring(1)))) ? i.substring(0,1) : i.substring(0,2);
    var row = (!isNaN(parseInt(i.substring(1)))) ? parseInt(i.substring(1)) : parseInt(i.substring(2));
    var value = grossPayoutSheet[i].v;
    if (row === 2) {
     var value = grossPayoutSheet[i].v;
     headers[col] = value.trim();
     continue;
    }
    if (row !== 1 && !data[row]) {
     data[row] = {};
    } else if (row !== 1){
     data[row][headers[col]] = value;
    }
   }

the value in the cell B3 is

05/07/2017

but after parsing the value is

B3: { t: 'n', v: 42921, w: '42921' }

I want the date in string format that is I want to change the cell format from 'n' to 's'

Can anyone please me out with this?

node.js xlsx
4 Answers
var workbook = XLSX.read(data, {
  type: 'binary',
  cellDates: true,
  cellNF: false,
  cellText: false
});
user_120245200 
 const workbook = excel.readFile(file.path);

 const sheet_name_list = workbook.SheetNames;
 const json = excel.utils.sheet_to_json(workbook.Sheets[sheet_name_list[0]], {
  raw: false,
 });
user_54941260

So I got it working yesterday: 

import * as XLSX from 'xlsx'
import * as df from 'dateformat';
// Typescript but easy to convert
const workbook: any = XLSX.read(source, { 'type': type, cellDates: true });
// passing the option 'cellDates': true is important
// ...
// ... until you start reading cells
const cellAddress: any = { c: 5, r: 5 }; // column 5 / row 5 which is a date and formatted like that in xlsx
const cell_ref: string = XLSX.utils.encode_cell(cellAddress);
const cell: any = worksheet[cell_ref];
if (cell) {
    let value: any = cell.v;
    const parsedDate: Date = new Date(value);
    parsedDate.setHours(parsedDate.getHours() + timezoneOffset); // utc-dates
    value = df(parsedDate, "dd/mm/yyyy");
}

This is just a snippet but the essentials are in there :-) Hope this might help you! Btw I am using a xlsx-file.

The trick is to pass the option 'cellDates: true' and then to just instantiate a date from the numbers value and it should work out. Your date will probably be a few hours off because of the utc-dates in JS, which you can even out by adding the offset to the date.

user_21225520 
const workbook = XLSX.readFile(file, {cellDates: true, dateNF:"dd/mm/yy"})
user_11421370
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