Converting Number representation of Date in excel to Date in java

Question

I have date column in excel, but when I\'m reading in my java application I\'m getting value as number

Example

Excel Date

1/1/2013
         


        

Answer 1

Excel’s serialized dates are the number of days since 1/1/1900. In order to figure out the date again, we have to add the serial number worth of days.

for Java 8 without any dependency

```

  /*

    1900-1-0            0
    1900-1-1            1
    1900-1-2            2
    1900-1-3            3


     */


    int days = 43323;
    LocalDate start = LocalDate.of(1900, 1, 1);
    LocalDate today = LocalDate.of(2018, 8, 11);


    // days to date
    LocalDate date = start.plusDays(days).minusDays(2);

    System.out.println(date);

    // date to days
    long days1 = ChronoUnit.DAYS.between(start, today) + 2;
    System.out.println(days1);

```