Show some features from joda time library. Url: http://joda-time.sourceforge.net/ maven: http://tinyurl.com/joda-maven-search-org

JodaExamples.java

package de.dailab.joda;

import java.text.SimpleDateFormat;
import java.util.TimeZone;

import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.Days;
import org.joda.time.Period;
import org.joda.time.format.PeriodFormatter;
import org.joda.time.format.PeriodFormatterBuilder;

public class JodaExamples {

  final static SimpleDateFormat fmt = new SimpleDateFormat("yyyy/MM/dd' - 'HH:mm:ss z");
	
	public static void main(String[] args) {
		fmt.setTimeZone(TimeZone.getTimeZone("UTC"));

		/*
		 * Snippet 1
		 * 
		 * Get the number of days between to DatesTimes. (ignore the current times of the DateTimes) 
		 */
		System.out.println("Snippet 1: ");
		DateTime dt1 = new DateTime(2013, 5, 31, 14, 35, 1, DateTimeZone.UTC);
		DateTime dt2 = new DateTime(2013, 6, 1, 15, 0, 1, DateTimeZone.UTC);
		int daysBetween = Days.daysBetween(dt1.toDateMidnight(), dt2.toDateMidnight()).getDays();
		System.out.println(String.format("%s day(s) between dt1 and dt2.", daysBetween)); // 1 day
		
		/*
		 * Snippet 2
		 * 
		 * Get a period between to DateTimes
		 */
		System.out.println("\nSnippet 2: ");
		DateTime dt3 = new DateTime(2013, 5, 31, 5, 30, 15, DateTimeZone.UTC);
		DateTime dt4 = dt3.plusDays(1).plusHours(13).plusMinutes(5).plusSeconds(45);
		Period period = new Period(dt3, dt4);
		PeriodFormatter DDHHMMSSFormater = new PeriodFormatterBuilder()
				.printZeroAlways()
				.minimumPrintedDigits(2)
				.appendDays().appendSeparator(" day(s) ")
				.appendHours().appendSeparator(" hour(s) ")
				.appendMinutes().appendSeparator(" minute(s) ")
				.appendSeconds().appendLiteral(" second(s)")
				.toFormatter();
		System.out.println(DDHHMMSSFormater.print(period));
		
		/*
		 * Snippet 3
		 * 
		 *  Truncate the date from a DateTime
		 */
		System.out.println("\nSnippet 3: ");
		DateTime dt5 = new DateTime(2013, 5, 31, 15, 15, 15, DateTimeZone.UTC);
		DateTime dt6 = new DateTime(2013, 5, 31, 0, 0, 1, DateTimeZone.UTC);
		int timeOfDayinMilis = dt5.millisOfDay().get();
		DateTime dt7 = new DateTime(timeOfDayinMilis);
		System.out.println("milis: "+dt7.getMillis()+" = "+fmt.format(dt7.toDate()));
		timeOfDayinMilis = dt6.millisOfDay().get();
		DateTime dt8 = new DateTime(timeOfDayinMilis);
		System.out.println("milis: "+dt8.getMillis()+" = "+fmt.format(dt8.toDate()));
	}

}