How to get the last date of a particular month with JodaTime?

I need to get the first date (as org.joda.time.LocalDate) of a month and the last one. Getting the first is trivial, but getting the last seems to need some logic as months have different length and February length even varies over years. Is there a mechanism for this already built in to JodaTime or should I implement it myself?

Solution 1:

How about:

LocalDate endOfMonth = date.dayOfMonth().withMaximumValue();

dayOfMonth() returns a LocalDate.Property which represents the "day of month" field in a way which knows the originating LocalDate.

As it happens, the withMaximumValue() method is even documented to recommend it for this particular task:

This operation is useful for obtaining a LocalDate on the last day of the month, as month lengths vary.

LocalDate lastDayOfMonth = dt.dayOfMonth().withMaximumValue();

Solution 2:

Another simple method is this:

//Set the Date in First of the next Month:
answer = new DateTime(year,month+1,1,0,0,0);
//Now take away one day and now you have the last day in the month correctly
answer = answer.minusDays(1);

Solution 3:

An old question, but a top google result when I was looking for this.

If someone needs the actual last day as an int instead using JodaTime you can do this:

public static final int JANUARY = 1;

public static final int DECEMBER = 12;

public static final int FIRST_OF_THE_MONTH = 1;

public final int getLastDayOfMonth(final int month, final int year) {
    int lastDay = 0;

    if ((month >= JANUARY) && (month <= DECEMBER)) {
        LocalDate aDate = new LocalDate(year, month, FIRST_OF_THE_MONTH);

        lastDay = aDate.dayOfMonth().getMaximumValue();
    }

    return lastDay;
}