Program in Java to convert a date to serial number as done in Excel

Question

I have written a function but it does not give an actual O/P...

public int date(Object O) {
    if (O instanceof Date) {
        Date d1 = (Date) O;
                 


        

Answer 1

The right algorithm is already implemented in Apache POI. Take a look at class org.apache.poi.ss.usermodel.DateUtil.

Also this description could be useful: http://support.microsoft.com/kb/214094/en-us