excel date to javascript date
// function to convert excel date to normal js date
excelDateToJSDate(excelDate) {
var date = new Date(Math.round((excelDate - (25567 + 1)) * 86400 * 1000));
var converted_date = date.toISOString().split('T')[0];
return converted_date;
}/use excel-date-to-js
//Description
//Converts Excel date in integer format into JS date.
//Dates are stored as numbers in Excel
//and count the number of days since January 0, 1900 (1900 standard, for mac it is 1904, which means January 0, 1904 is the start date).
//Times are handled internally as numbers between 0 and 1.
//Install
//npm install -s excel-date-to-js
//Usage
const { getJsDateFromExcel } = require("excel-date-to-js");
getJsDateFromExcel("42510");
// 2016-05-20T00:00:00.000Zvar record_date = Date.parse(item.record_date_string)
var days = Math.round((record_date - new Date(1899, 11, 30)) / 8.64e7);
item.record_date = parseInt((days).toFixed(10));
return item;function ExcelDateToJSDate(serial) {
var utc_days = Math.floor(serial - 25569);
var utc_value = utc_days * 86400;
var date_info = new Date(utc_value * 1000);
var fractional_day = serial - Math.floor(serial) + 0.0000001;
var total_seconds = Math.floor(86400 * fractional_day);
var seconds = total_seconds % 60;
total_seconds -= seconds;
var hours = Math.floor(total_seconds / (60 * 60));
var minutes = Math.floor(total_seconds / 60) % 60;
return new Date(date_info.getFullYear(), date_info.getMonth(), date_info.getDate(), hours, minutes, seconds);
}