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Convert Excel date values to JavaScript date objects
// 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 2 (Google "excel leap year bug")
// 2. Convert to milliseconds.
return new Date((excelDate - (25567 + 2))*86400*1000);
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