Converting Excel Date Serial Number to Date using Javascript

Question

I have the following javascript code that convert date (string) to the Date Serial Number used in Microsoft Excel:

function JSDateToExcelDate(inDate) {

             


        

Answer 1

So, there I was, having the same problem, then some solutions bumped up but started to have troubles with the Locale, Time Zones, etc, but in the end was able to add the precision needed

toDate(serialDate, time = false) {
    let locale = navigator.language;
    let offset = new Date(0).getTimezoneOffset();
    let date = new Date(0, 0, serialDate, 0, -offset, 0);
    if (time) {
        return serialDate.toLocaleTimeString(locale)
    }
    return serialDate.toLocaleDateString(locale)
}

The function's 'time' argument chooses between displaying the entire date or just the date's time