Java: calculate the number of days between two Dates

The following procedures help you calculate days between two Dates.

1. Java 8:
      LocalDate d1 = LocalDate.of (2014, 05, 11);
      LocalDate d2 = LocalDate.of (1998, 12, 23);

      long dayDiff = d2.until(d1, DAYS);

2. Before Java 8
      String sDate1 = "05/11/2014";
      String sDate2 = "12/23/1998";

      SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");

      Date d1 = sdf.parse(sDate1);
      Date d2 = sdf.parse(sDate2);

      long timeDiff = d1.getTimeInMillis() - d2.getTimeInMillis();

      long dayDiff = TimeUnit.DAYS.convert(timeDiff, TimeUnit.MILLISECONDS);
      //or convert the time to days using code below
      //long dayDiff = timeDiff / 1000 /(24 * 60 * 60);

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