Parse Dates from and to ISO date format

DateTimeUtils.java

/**
 * Joda Time libraries required!
 * You can get them here https://github.com/JodaOrg/joda-time/releases
 */

import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;

import java.util.Calendar;
import java.util.Date;

/**
 * Created by alvaro on 25/08/14.
 */
public class DateTimeUtils {
    static public DateTimeFormatter parser = ISODateTimeFormat.dateTimeParser();
    private DateTimeUtils(){

    }

    /**
     * Converts an ISO String into a Date object
     * @param date ISO String
     * @return converted Date
     */
    public static Date parse(String date){
        return new Date(parser.parseDateTime(date).getMillis());
    }

    /**
     * Converts a Date object into a ISO date String
     * @param date Date object to convert
     * @return String in ISO date format
     */
    public static String toString(Date date){
        DateTimeFormatter parser = ISODateTimeFormat.dateTime();
        return parser.print(date.getTime());
    }

    /**
     * Converts a Calendar object into a ISO date String
     * @param date Calendar object to convert
     * @return String in ISO date format
     */
    public static String toString(Calendar date){
        return toString(date.getTime());
    }
}