read-excel-file/modules/xlsx/parseExcelDate.js

Read `.xlsx` files in a web browser or in Node.js

import parseExcelTimestamp from './parseExcelTimestamp.js';

// Parses an Excel Date (represented by a "serial" floating-point number)
// into a javascript `Date` in UTC+0 timezone (with time is set to 00:00).
//
// https://www.pcworld.com/article/3063622/software/mastering-excel-date-time-serial-numbers-networkdays-datevalue-and-more.html
// "If you need to calculate dates in your spreadsheets,
//  Excel uses its own unique system, which it calls Serial Numbers".
//
export default function parseExcelDate(excelSerialDate, epoch1904) {
  return new Date(parseExcelTimestamp(excelSerialDate, epoch1904));
}
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