Example of week intervals generation in Gregorian model using JodaTime and Guava;

Example.java

package br.com.tecsinapse.examples;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import org.joda.time.LocalDate;
import org.joda.time.YearMonth;

import com.google.common.base.Objects;
import com.google.common.collect.FluentIterable;

public class Example {

	public static class Period implements Serializable {
		private static final long serialVersionUID = 1L;

		private LocalDate begin;
		private LocalDate end;

		public Period(LocalDate begin, LocalDate end) {
			this.begin = begin;
			this.end = end;
		}

		public LocalDate getBegin() {
			return begin;
		}
		
		public void setBegin(LocalDate begin) {
			this.begin = begin;
		}

		public LocalDate getEnd() {
			return end;
		}

		public void setEnd(LocalDate end) {
			this.end = end;
		}

		@Override
		public String toString() {
			return Objects.toStringHelper(this).add("begin", getBegin())
					.add("end", getEnd()).toString();
		}
	}
	
	public static void main(String[] args) {
		for (int month = 1; month < 13 ; month++) {

			YearMonth yearMonth = new YearMonth(2014,month);

			List<Period> periodos = new ArrayList<>();

			LocalDate firstDayMonth = yearMonth.toLocalDate(1);
			LocalDate lastDayMonth = firstDayMonth.dayOfMonth().withMaximumValue();

			LocalDate firstDay = firstDayMonth;
			LocalDate lastDay = firstDayMonth;
			while (lastDay.isBefore(lastDayMonth)) {
				lastDay = firstDay.plusDays(1).dayOfWeek().withMaximumValue().minusDays(1);
				Period periodo = new Period(firstDay, lastDay);
				periodos.add(periodo);
				firstDay = lastDay.plusDays(1);
			}
			FluentIterable.from(periodos).last().get().setEnd(lastDayMonth);

			System.out.println(periodos.size());

			for (Period periodo : periodos) {
				System.out.println(periodo);
			}
		}
	}
}