Convert Excel date values to JavaScript date objects

ExcelToJsDate.js

// Convert Excel dates into JS date objects
//
// @param excelDate {Number}
// @return {Date}

function getJsDateFromExcel(excelDate) {

  // JavaScript dates can be constructed by passing milliseconds
  // since the Unix epoch (January 1, 1970) example: new Date(12312512312);

  // 1. Subtract number of days between Jan 1, 1900 and Jan 1, 1970, plus 1 (Google "excel leap year bug")             
  // 2. Convert to milliseconds.

	return new Date((excelDate - (25567 + 1))*86400*1000);

}