Java compute duration of Project and Tasks doesnt work

Question

I am trying to compute the duration Of each Project and each Task appointed to the Project, unfortunately it always returns 0. computeDuration:

        Date minDate = projectTasks[0].gettaskFromDate();
        Date maxDate = projectTasks[0].gettaskEndDate();
        for (int i = 0; i < numOfTasks; ++i) {
            if (projectTasks[i] != null && projectTasks[i].gettaskEndDate() != null && projectTasks[i].gettaskFromDate() != null) {
                projectTasks[i].settaskDuration(utils.Globals.computeDuration(projectTasks[i].gettaskFromDate(), projectTasks[i].gettaskEndDate()));
            }
        }
        for (int i = 0; i < numOfTasks; ++i) {
            if (projectTasks[i] != null && projectTasks[i].gettaskEndDate() != null && projectTasks[i].gettaskFromDate() != null) {
                if (utils.Globals.validateDates(projectTasks[i].gettaskFromDate(), minDate)) {
                    minDate = projectTasks[i].gettaskFromDate();
                }
                if (utils.Globals.validateDates(maxDate, projectTasks[i].gettaskEndDate())) {
                    maxDate = projectTasks[i].gettaskEndDate();
                }
            }
        }
        setprojectDuration(utils.Globals.computeDuration(minDate, maxDate));
    }

utils.Globals.validateDates:

public static boolean validateDates(Date from, Date to){
        return from.before(to);
    }

utils.Globals.computeDuration:

 public static int computeDuration(Date from, Date to){
        long diffIn = Math.abs(to.getTime() - from.getTime());
        int duration = (int) TimeUnit.DAYS.convert(diffIn, TimeUnit.MILLISECONDS);
        return duration;
    }

Thanks in advance!

Answer 1

You could confirm if the diff between your from and to dates is over one day or not. If all diffs is less than one day, then computeDuration return 0 always.

Please check DAYS diff is expected or not in the blow codes.

 public static int computeDuration(Date from, Date to){
        long diffIn = Math.abs(to.getTime() - from.getTime());
        int duration = (int) TimeUnit.DAYS.convert(diffIn, TimeUnit.MILLISECONDS);
        return duration;
    }