How do I obtain the number of days within a given month using Joda-Time?

If you have a DateTime object which represents a value in the month, then it’s pretty straightforward. You get the dayOfMonth property from that DateTime object and get the maximum value of the property. Here is a sample function:

public static int daysOfMonth(int year, int month) {
  DateTime dateTime = new DateTime(year, month, 14, 12, 0, 0, 000);
  return dateTime.dayOfMonth().getMaximumValue();
}