CompareTwoDates.java

package com.levelup.java.date;

import static org.junit.Assert.assertTrue;

import java.time.LocalDate;
import java.time.Month;
import java.util.Calendar;

import org.apache.commons.lang3.time.DateUtils;
import org.joda.time.DateTime;
import org.joda.time.chrono.GregorianChronology;
import org.junit.Test;

/**
 * This java example will demonstrate how to compare two dates
 * 
 * @author Justin Musgrove
 * @see <a
 *      href='http://www.leveluplunch.com/java/examples/compare-dates/'>Compare
 *      dates</a>
 * 
 */
public class CompareTwoDates {

	@Test
	public void compare_two_dates_java() {

		Calendar sinceGraduation = Calendar.getInstance();
		sinceGraduation.set(Calendar.YEAR, 1984);
		sinceGraduation.set(Calendar.MONTH, 6);
		sinceGraduation.set(Calendar.DAY_OF_MONTH, 4);

		Calendar today = Calendar.getInstance();

		assertTrue(today.after(sinceGraduation));
	}

	@Test
	public void compare_two_dates_java8() {

		LocalDate sinceGraduation = LocalDate.of(1984, Month.JUNE, 4);
		LocalDate today = LocalDate.now();

		assertTrue(today.isAfter(sinceGraduation));
	}

	@Test
	public void compare_two_dates_with_joda() {

		DateTime sinceGraduation = new DateTime(1984, 6, 4, 0, 0,
				GregorianChronology.getInstance());
		DateTime today = new DateTime(); // current date

		assertTrue(today.isAfter(sinceGraduation));
	}

	@Test
	public void compare_two_Dates_apachecommons() {

		Calendar sinceGraduation = Calendar.getInstance();
		sinceGraduation.set(Calendar.YEAR, 1984);
		sinceGraduation.set(Calendar.MONTH, 6);
		sinceGraduation.set(Calendar.DAY_OF_MONTH, 4);

		Calendar today = Calendar.getInstance();

		int val = DateUtils.truncatedCompareTo(sinceGraduation, today,
				Calendar.MINUTE);

		assertTrue(val <= 0);
	}

}