How to get list of dates between two dates?

android, java, jodatime

Solution

For a list you could just do:

public static List<LocalDate> datesBetween(LocalDate start, LocalDate end) {
    List<LocalDate> ret = new ArrayList<LocalDate>();
    for (LocalDate date = start; !date.isAfter(end); date = date.plusDays(1)) {
        ret.add(date);
    }
    return ret;
}

Note, that will include `end`. If you want it to exclude the end, just change the condition in the loop to `date.isBefore(end)`.

If you only need an `Iterable<LocalDate>` you could write your own class to do this very efficiently rather than building up a list. You could do this with an anonymous class, if you didn't mind a fair degree of nesting. For example (untested):

public static Iterable<LocalDate> datesBetween(final LocalDate start,
                                               final LocalDate end) {
    return new Iterable<LocalDate>() {
        @Override public Iterator<LocalDate> iterator() {
            return new Iterator<LocalDate>() {
                private LocalDate next = start;

                @Override
                public boolean hasNext() {
                    return !next.isAfter(end);
                }

                @Override
                public LocalDate next() {
                    if (next.isAfter(end)) {
                        throw NoSuchElementException();
                    }
                    LocalDate ret = next;
                    next = next.plusDays(1);
                    return ret;
                }

                @Override
                public void remove() {
                    throw new UnsupportedOperationException();
                }
            };
        }
    };
}

Problem

Original source

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