/*
    *  Copyright 2001-2011 Stephen Colebourne
    *
    *  Licensed under the Apache License, Version 2.0 (the "License");
    *  you may not use this file except in compliance with the License.
    *  You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
    *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   */
  package org.joda.time;
  
  import java.io.Serializable;
  import java.util.Calendar;
  import java.util.Date;
  import java.util.Locale;
  
  import org.joda.time.base.BasePartial;
  import org.joda.time.chrono.ISOChronology;
  import org.joda.time.field.AbstractPartialFieldProperty;
  import org.joda.time.field.FieldUtils;
  import org.joda.time.format.ISODateTimeFormat;
  
  /**
   * YearMonthDay is an immutable partial supporting the year, monthOfYear
   * and dayOfMonth fields.
   * <p>
   * NOTE: This class only supports the three fields listed above. Thus, you
   * cannot query the dayOfWeek or centuryOfEra fields for example.
   * The new <code>LocalDate</code> class removes this restriction.
   * <p>
   * Calculations on YearMonthDay are performed using a {@link Chronology}.
   * This chronology is set to be in the UTC time zone for all calculations.
   * <p>
   * Each individual field can be queried in two ways:
   * <ul>
   * <li><code>getMonthOfYear()</code>
   * <li><code>monthOfYear().get()</code>
   * </ul>
   * The second technique also provides access to other useful methods on the
   * field:
   * <ul>
   * <li>numeric value - <code>monthOfYear().get()</code>
   * <li>text value - <code>monthOfYear().getAsText()</code>
   * <li>short text value - <code>monthOfYear().getAsShortText()</code>
   * <li>maximum/minimum values - <code>monthOfYear().getMaximumValue()</code>
   * <li>add/subtract - <code>monthOfYear().addToCopy()</code>
   * <li>set - <code>monthOfYear().setCopy()</code>
   * </ul>
   * <p>
   * YearMonthDay is thread-safe and immutable, provided that the Chronology is as well.
   * All standard Chronology classes supplied are thread-safe and immutable.
   *
   * @author Stephen Colebourne
   * @since 1.0
   * @deprecated Use LocalDate which has a much better internal implementation and
   *  has been available since 1.3
   */
  @Deprecated
  public final class YearMonthDay
          extends BasePartial
          implements ReadablePartial, Serializable {
  
      /** Serialization version */
      private static final long serialVersionUID = 797544782896179L;
      /** The singleton set of field types */
      private static final DateTimeFieldType[] FIELD_TYPES = new DateTimeFieldType[] {
          DateTimeFieldType.year(),
          DateTimeFieldType.monthOfYear(),
          DateTimeFieldType.dayOfMonth(),
      };
  
      /** The index of the year field in the field array */
      public static final int YEAR = 0;
      /** The index of the monthOfYear field in the field array */
      public static final int MONTH_OF_YEAR = 1;
      /** The index of the dayOfMonth field in the field array */
      public static final int DAY_OF_MONTH = 2;
  
      //-----------------------------------------------------------------------
      /**
       * Constructs a YearMonthDay from a <code>java.util.Calendar</code>
       * using exactly the same field values avoiding any time zone effects.
       * <p>
       * Each field is queried from the Calendar and assigned to the YearMonthDay.
       * This is useful if you have been using the Calendar as a local date,
       * ignoing the zone.
       * <p>
       * This factory method ignores the type of the calendar and always
       * creates a YearMonthDay with ISO chronology. It is expected that you
       * will only pass in instances of <code>GregorianCalendar</code> however
       * this is not validated.
       *
       * @param calendar  the Calendar to extract fields from
      * @return the created YearMonthDay
      * @throws IllegalArgumentException if the calendar is null
      * @throws IllegalArgumentException if the date is invalid for the ISO chronology
      * @since 1.2
      */
     public static YearMonthDay fromCalendarFields(Calendar calendar) {
         if (calendar == null) {
             throw new IllegalArgumentException("The calendar must not be null");
         }
         return new YearMonthDay(
             calendar.get(Calendar.YEAR),
             calendar.get(Calendar.MONTH) + 1,
             calendar.get(Calendar.DAY_OF_MONTH)
         );
     }
 
     /**
      * Constructs a YearMonthDay from a <code>java.util.Date</code>
      * using exactly the same field values avoiding any time zone effects.
      * <p>
      * Each field is queried from the Date and assigned to the YearMonthDay.
      * This is useful if you have been using the Date as a local date,
      * ignoing the zone.
      * <p>
      * This factory method always creates a YearMonthDay with ISO chronology.
      *
      * @param date  the Date to extract fields from
      * @return the created YearMonthDay
      * @throws IllegalArgumentException if the calendar is null
      * @throws IllegalArgumentException if the date is invalid for the ISO chronology
      * @since 1.2
      */
     public static YearMonthDay fromDateFields(Date date) {
         if (date == null) {
             throw new IllegalArgumentException("The date must not be null");
         }
         return new YearMonthDay(
             date.getYear() + 1900,
             date.getMonth() + 1,
             date.getDate()
         );
     }
 
     //-----------------------------------------------------------------------
     /**
      * Constructs a YearMonthDay with the current date, using ISOChronology in
      * the default zone to extract the fields.
      * <p>
      * The constructor uses the default time zone, resulting in the local time
      * being initialised. Once the constructor is complete, all further calculations
      * are performed without reference to a timezone (by switching to UTC).
      */
     public YearMonthDay() {
         super();
     }
 
     /**
      * Constructs a YearMonthDay with the current date, using ISOChronology in
      * the specified zone to extract the fields.
      * <p>
      * The constructor uses the specified time zone to obtain the current date.
      * Once the constructor is complete, all further calculations
      * are performed without reference to a timezone (by switching to UTC).
      * 
      * @param zone  the zone to use, null means default zone
      * @since 1.1
      */
     public YearMonthDay(DateTimeZone zone) {
         super(ISOChronology.getInstance(zone));
     }
 
     /**
      * Constructs a YearMonthDay with the current date, using the specified chronology
      * and zone to extract the fields.
      * <p>
      * The constructor uses the time zone of the chronology specified.
      * Once the constructor is complete, all further calculations are performed
      * without reference to a timezone (by switching to UTC).
      *
      * @param chronology  the chronology, null means ISOChronology in the default zone
      */
     public YearMonthDay(Chronology chronology) {
         super(chronology);
     }
 
     /**
      * Constructs a YearMonthDay extracting the partial fields from the specified
      * milliseconds using the ISOChronology in the default zone.
      * <p>
      * The constructor uses the default time zone, resulting in the local time
      * being initialised. Once the constructor is complete, all further calculations
      * are performed without reference to a timezone (by switching to UTC).
      *
      * @param instant  the milliseconds from 1970-01-01T00:00:00Z
      */
     public YearMonthDay(long instant) {
         super(instant);
     }
 
     /**
      * Constructs a YearMonthDay extracting the partial fields from the specified
      * milliseconds using the chronology provided.
      * <p>
      * The constructor uses the time zone of the chronology specified.
      * Once the constructor is complete, all further calculations are performed
      * without reference to a timezone (by switching to UTC).
      *
      * @param instant  the milliseconds from 1970-01-01T00:00:00Z
      * @param chronology  the chronology, null means ISOChronology in the default zone
      */
     public YearMonthDay(long instant, Chronology chronology) {
         super(instant, chronology);
     }
 
     /**
      * Constructs a YearMonthDay from an Object that represents a time.
      * <p>
      * The recognised object types are defined in
      * {@link org.joda.time.convert.ConverterManager ConverterManager} and
      * include ReadableInstant, String, Calendar and Date.
      * The String formats are described by {@link ISODateTimeFormat#dateOptionalTimeParser()}.
      * <p>
      * The chronology used will be derived from the object, defaulting to ISO.
      * <p>
      * NOTE: Prior to v1.3 the string format was described by
      * {@link ISODateTimeFormat#dateTimeParser()}. Time ony strings are now rejected.
      *
      * @param instant  the datetime object, null means now
      * @throws IllegalArgumentException if the instant is invalid
      */
     public YearMonthDay(Object instant) {
         super(instant, null, ISODateTimeFormat.dateOptionalTimeParser());
     }
 
     /**
      * Constructs a YearMonthDay from an Object that represents a time, using the
      * specified chronology.
      * <p>
      * The recognised object types are defined in
      * {@link org.joda.time.convert.ConverterManager ConverterManager} and
      * include ReadableInstant, String, Calendar and Date.
      * The String formats are described by {@link ISODateTimeFormat#dateOptionalTimeParser()}.
      * <p>
      * The constructor uses the time zone of the chronology specified.
      * Once the constructor is complete, all further calculations are performed
      * without reference to a timezone (by switching to UTC).
      * The specified chronology overrides that of the object.
      * <p>
      * NOTE: Prior to v1.3 the string format was described by
      * {@link ISODateTimeFormat#dateTimeParser()}. Time only strings are now rejected.
      *
      * @param instant  the datetime object, null means now
      * @param chronology  the chronology, null means ISO default
      * @throws IllegalArgumentException if the instant is invalid
      */
     public YearMonthDay(Object instant, Chronology chronology) {
         super(instant, DateTimeUtils.getChronology(chronology), ISODateTimeFormat.dateOptionalTimeParser());
     }
 
     /**
      * Constructs a YearMonthDay with specified time field values
      * using <code>ISOChronology</code> in the default zone.
      * <p>
      * The constructor uses the no time zone initialising the fields as provided.
      * Once the constructor is complete, all further calculations
      * are performed without reference to a timezone (by switching to UTC).
      *
      * @param year  the year
      * @param monthOfYear  the month of the year
      * @param dayOfMonth  the day of the month
      */
     public YearMonthDay(int year, int monthOfYear, int dayOfMonth) {
         this(year, monthOfYear, dayOfMonth, null);
     }
 
     /**
      * Constructs a YearMonthDay with specified time field values.
      * <p>
      * The constructor uses the time zone of the chronology specified.
      * Once the constructor is complete, all further calculations are performed
      * without reference to a timezone (by switching to UTC).
      *
      * @param year  the year
      * @param monthOfYear  the month of the year
      * @param dayOfMonth  the day of the month
      * @param chronology  the chronology, null means ISOChronology in the default zone
      */
     public YearMonthDay(int year, int monthOfYear, int dayOfMonth, Chronology chronology) {
         super(new int[] {year, monthOfYear, dayOfMonth}, chronology);
     }
 
     /**
      * Constructs a YearMonthDay with chronology from this instance and new values.
      *
      * @param partial  the partial to base this new instance on
      * @param values  the new set of values
      */
     YearMonthDay(YearMonthDay partial, int[] values) {
         super(partial, values);
     }
 
     /**
      * Constructs a YearMonthDay with values from this instance and a new chronology.
      *
      * @param partial  the partial to base this new instance on
      * @param chrono  the new chronology
      */
     YearMonthDay(YearMonthDay partial, Chronology chrono) {
         super(partial, chrono);
     }
 
     //-----------------------------------------------------------------------
     /**
      * Gets the number of fields in this partial.
      * 
      * @return the field count
      */
     public int size() {
         return 3;
     }
 
     /**
      * Gets the field for a specific index in the chronology specified.
      * <p>
      * This method must not use any instance variables.
      * 
      * @param index  the index to retrieve
      * @param chrono  the chronology to use
      * @return the field
      */
     protected DateTimeField getField(int index, Chronology chrono) {
         switch (index) {
             case YEAR:
                 return chrono.year();
             case MONTH_OF_YEAR:
                 return chrono.monthOfYear();
             case DAY_OF_MONTH:
                 return chrono.dayOfMonth();
             default:
                 throw new IndexOutOfBoundsException("Invalid index: " + index);
         }
     }
 
     /**
      * Gets the field type at the specified index.
      *
      * @param index  the index to retrieve
      * @return the field at the specified index
      * @throws IndexOutOfBoundsException if the index is invalid
      */
     public DateTimeFieldType getFieldType(int index) {
         return FIELD_TYPES[index];
     }
 
     /**
      * Gets an array of the field type of each of the fields that this partial supports.
      * <p>
      * The fields are returned largest to smallest, Year, Month, Day
      *
      * @return the array of field types (cloned), largest to smallest
      */
     public DateTimeFieldType[] getFieldTypes() {
         return (DateTimeFieldType[]) FIELD_TYPES.clone();
     }
 
     //-----------------------------------------------------------------------
     /**
      * Returns a copy of this date with the specified chronology.
      * This instance is immutable and unaffected by this method call.
      * <p>
      * This method retains the values of the fields, thus the result will
      * typically refer to a different instant.
      * <p>
      * The time zone of the specified chronology is ignored, as YearMonthDay
      * operates without a time zone.
      *
      * @param newChronology  the new chronology, null means ISO
      * @return a copy of this datetime with a different chronology
      * @throws IllegalArgumentException if the values are invalid for the new chronology
      */
     public YearMonthDay withChronologyRetainFields(Chronology newChronology) {
         newChronology = DateTimeUtils.getChronology(newChronology);
         newChronology = newChronology.withUTC();
         if (newChronology == getChronology()) {
             return this;
         } else {
             YearMonthDay newYearMonthDay = new YearMonthDay(this, newChronology);
             newChronology.validate(newYearMonthDay, getValues());
             return newYearMonthDay;
         }
     }
 
     /**
      * Returns a copy of this date with the specified field set to a new value.
      * <p>
      * For example, if the field type is <code>dayOfMonth</code> then the day
      * would be changed in the returned instance.
      * <p>
      * These three lines are equivalent:
      * <pre>
      * YearMonthDay updated = ymd.withField(DateTimeFieldType.dayOfMonth(), 6);
      * YearMonthDay updated = ymd.dayOfMonth().setCopy(6);
      * YearMonthDay updated = ymd.property(DateTimeFieldType.dayOfMonth()).setCopy(6);
      * </pre>
      *
      * @param fieldType  the field type to set, not null
      * @param value  the value to set
      * @return a copy of this instance with the field set
      * @throws IllegalArgumentException if the value is null or invalid
      */
     public YearMonthDay withField(DateTimeFieldType fieldType, int value) {
         int index = indexOfSupported(fieldType);
         if (value == getValue(index)) {
             return this;
         }
         int[] newValues = getValues();
         newValues = getField(index).set(this, index, newValues, value);
         return new YearMonthDay(this, newValues);
     }
 
     /**
      * Returns a copy of this date with the value of the specified field increased.
      * <p>
      * If the addition is zero, then <code>this</code> is returned.
      * <p>
      * These three lines are equivalent:
      * <pre>
      * YearMonthDay added = ymd.withFieldAdded(DurationFieldType.days(), 6);
      * YearMonthDay added = ymd.plusDays(6);
      * YearMonthDay added = ymd.dayOfMonth().addToCopy(6);
      * </pre>
      * 
      * @param fieldType  the field type to add to, not null
      * @param amount  the amount to add
      * @return a copy of this instance with the field updated
      * @throws IllegalArgumentException if the value is null or invalid
      * @throws ArithmeticException if the new datetime exceeds the capacity
      */
     public YearMonthDay withFieldAdded(DurationFieldType fieldType, int amount) {
         int index = indexOfSupported(fieldType);
         if (amount == 0) {
             return this;
         }
         int[] newValues = getValues();
         newValues = getField(index).add(this, index, newValues, amount);
         return new YearMonthDay(this, newValues);
     }
 
     /**
      * Returns a copy of this date with the specified period added.
      * <p>
      * If the addition is zero, then <code>this</code> is returned.
      * Fields in the period that aren't present in the partial are ignored.
      * <p>
      * This method is typically used to add multiple copies of complex
      * period instances. Adding one field is best achieved using methods
      * like {@link #withFieldAdded(DurationFieldType, int)}
      * or {@link #plusYears(int)}.
      * 
      * @param period  the period to add to this one, null means zero
      * @param scalar  the amount of times to add, such as -1 to subtract once
      * @return a copy of this instance with the period added
      * @throws ArithmeticException if the new datetime exceeds the capacity
      */
     public YearMonthDay withPeriodAdded(ReadablePeriod period, int scalar) {
         if (period == null || scalar == 0) {
             return this;
         }
         int[] newValues = getValues();
         for (int i = 0; i < period.size(); i++) {
             DurationFieldType fieldType = period.getFieldType(i);
             int index = indexOf(fieldType);
             if (index >= 0) {
                 newValues = getField(index).add(this, index, newValues,
                         FieldUtils.safeMultiply(period.getValue(i), scalar));
             }
         }
         return new YearMonthDay(this, newValues);
     }
 
     //-----------------------------------------------------------------------
     /**
      * Returns a copy of this date with the specified period added.
      * <p>
      * If the amount is zero or null, then <code>this</code> is returned.
      * <p>
      * This method is typically used to add complex period instances.
      * Adding one field is best achieved using methods
      * like {@link #plusYears(int)}.
      * 
      * @param period  the duration to add to this one, null means zero
      * @return a copy of this instance with the period added
      * @throws ArithmeticException if the new datetime exceeds the capacity of a long
      */
     public YearMonthDay plus(ReadablePeriod period) {
         return withPeriodAdded(period, 1);
     }
 
     //-----------------------------------------------------------------------
     /**
      * Returns a copy of this date plus the specified number of years.
      * <p>
      * This date instance is immutable and unaffected by this method call.
      * <p>
      * The following three lines are identical in effect:
      * <pre>
      * YearMonthDay added = dt.plusYears(6);
      * YearMonthDay added = dt.plus(Period.years(6));
      * YearMonthDay added = dt.withFieldAdded(DurationFieldType.years(), 6);
      * </pre>
      *
      * @param years  the amount of years to add, may be negative
      * @return the new date plus the increased years
      * @since 1.1
      */
     public YearMonthDay plusYears(int years) {
         return withFieldAdded(DurationFieldType.years(), years);
     }
 
     /**
      * Returns a copy of this date plus the specified number of months.
      * <p>
      * This date instance is immutable and unaffected by this method call.
      * <p>
      * The following three lines are identical in effect:
      * <pre>
      * YearMonthDay added = dt.plusMonths(6);
      * YearMonthDay added = dt.plus(Period.months(6));
      * YearMonthDay added = dt.withFieldAdded(DurationFieldType.months(), 6);
      * </pre>
      *
      * @param months  the amount of months to add, may be negative
      * @return the new date plus the increased months
      * @since 1.1
      */
     public YearMonthDay plusMonths(int months) {
         return withFieldAdded(DurationFieldType.months(), months);
     }
 
     /**
      * Returns a copy of this date plus the specified number of days.
      * <p>
      * This date instance is immutable and unaffected by this method call.
      * <p>
      * The following three lines are identical in effect:
      * <pre>
      * YearMonthDay added = dt.plusDays(6);
      * YearMonthDay added = dt.plus(Period.days(6));
      * YearMonthDay added = dt.withFieldAdded(DurationFieldType.days(), 6);
      * </pre>
      *
      * @param days  the amount of days to add, may be negative
      * @return the new date plus the increased days
      * @since 1.1
      */
     public YearMonthDay plusDays(int days) {
         return withFieldAdded(DurationFieldType.days(), days);
     }
 
     //-----------------------------------------------------------------------
     /**
      * Returns a copy of this date with the specified period taken away.
      * <p>
      * If the amount is zero or null, then <code>this</code> is returned.
      * <p>
      * This method is typically used to subtract complex period instances.
      * Subtracting one field is best achieved using methods
      * like {@link #minusYears(int)}.
      * 
      * @param period  the period to reduce this instant by
      * @return a copy of this instance with the period taken away
      * @throws ArithmeticException if the new datetime exceeds the capacity of a long
      */
     public YearMonthDay minus(ReadablePeriod period) {
         return withPeriodAdded(period, -1);
     }
 
     //-----------------------------------------------------------------------
     /**
      * Returns a copy of this date minus the specified number of years.
      * <p>
      * This datetime instance is immutable and unaffected by this method call.
      * <p>
      * The following three lines are identical in effect:
      * <pre>
      * YearMonthDay subtracted = dt.minusYears(6);
      * YearMonthDay subtracted = dt.minus(Period.years(6));
      * YearMonthDay subtracted = dt.withFieldAdded(DurationFieldType.years(), -6);
      * </pre>
      *
      * @param years  the amount of years to subtract, may be negative
      * @return the new datetime minus the increased years
      * @since 1.1
      */
     public YearMonthDay minusYears(int years) {
         return withFieldAdded(DurationFieldType.years(), FieldUtils.safeNegate(years));
     }
 
     /**
      * Returns a copy of this date minus the specified number of months.
      * <p>
      * This datetime instance is immutable and unaffected by this method call.
      * <p>
      * The following three lines are identical in effect:
      * <pre>
      * YearMonthDay subtracted = dt.minusMonths(6);
      * YearMonthDay subtracted = dt.minus(Period.months(6));
      * YearMonthDay subtracted = dt.withFieldAdded(DurationFieldType.months(), -6);
      * </pre>
      *
      * @param months  the amount of months to subtract, may be negative
      * @return the new datetime minus the increased months
      * @since 1.1
      */
     public YearMonthDay minusMonths(int months) {
         return withFieldAdded(DurationFieldType.months(), FieldUtils.safeNegate(months));
     }
 
     /**
      * Returns a copy of this date minus the specified number of days.
      * <p>
      * This datetime instance is immutable and unaffected by this method call.
      * <p>
      * The following three lines are identical in effect:
      * <pre>
      * YearMonthDay subtracted = dt.minusDays(6);
      * YearMonthDay subtracted = dt.minus(Period.days(6));
      * YearMonthDay subtracted = dt.withFieldAdded(DurationFieldType.days(), -6);
      * </pre>
      *
      * @param days  the amount of days to subtract, may be negative
      * @return the new datetime minus the increased days
      * @since 1.1
      */
     public YearMonthDay minusDays(int days) {
         return withFieldAdded(DurationFieldType.days(), FieldUtils.safeNegate(days));
     }
 
     //-----------------------------------------------------------------------
     /**
      * Gets the property object for the specified type, which contains
      * many useful methods.
      *
      * @param type  the field type to get the property for
      * @return the property object
      * @throws IllegalArgumentException if the field is null or unsupported
      */
     public Property property(DateTimeFieldType type) {
         return new Property(this, indexOfSupported(type));
     }
 
     //-----------------------------------------------------------------------
     /**
      * Converts this object to a LocalDate with the same date and chronology.
      *
      * @return a LocalDate with the same date and chronology
      * @since 1.3
      */
     public LocalDate toLocalDate() {
         return new LocalDate(getYear(), getMonthOfYear(), getDayOfMonth(), getChronology());
     }
 
     //-----------------------------------------------------------------------
     /**
      * Converts this YearMonthDay to a full datetime at midnight using the
      * default time zone.
      *
      * @return this date as a datetime at midnight
      */
     public DateTime toDateTimeAtMidnight() {
         return toDateTimeAtMidnight(null);
     }
 
     /**
      * Converts this YearMonthDay to a full datetime at midnight using the
      * specified time zone.
      * <p>
      * This method uses the chronology from this instance plus the time zone
      * specified.
      *
      * @param zone  the zone to use, null means default
      * @return this date as a datetime at midnight
      */
     public DateTime toDateTimeAtMidnight(DateTimeZone zone) {
         Chronology chrono = getChronology().withZone(zone);
         return new DateTime(getYear(), getMonthOfYear(), getDayOfMonth(), 0, 0, 0, 0, chrono);
     }
 
     //-----------------------------------------------------------------------
     /**
      * Converts this partial to a full datetime using the default time zone
      * setting the date fields from this instance and the time fields from
      * the current time.
      *
      * @return this date as a datetime with the time as the current time
      */
     public DateTime toDateTimeAtCurrentTime() {
         return toDateTimeAtCurrentTime(null);
     }
 
     /**
      * Converts this partial to a full datetime using the specified time zone
      * setting the date fields from this instance and the time fields from
      * the current time.
      * <p>
      * This method uses the chronology from this instance plus the time zone
      * specified.
      *
      * @param zone  the zone to use, null means default
      * @return this date as a datetime with the time as the current time
      */
     public DateTime toDateTimeAtCurrentTime(DateTimeZone zone) {
         Chronology chrono = getChronology().withZone(zone);
         long instantMillis = DateTimeUtils.currentTimeMillis();
         long resolved = chrono.set(this, instantMillis);
         return new DateTime(resolved, chrono);
     }
 
     //-----------------------------------------------------------------------
     /**
      * Converts this object to a DateMidnight in the default time zone.
      *
      * @return the DateMidnight instance in the default zone
      */
     public DateMidnight toDateMidnight() {
         return toDateMidnight(null);
     }
 
     /**
      * Converts this object to a DateMidnight.
      *
      * @param zone  the zone to get the DateMidnight in, null means default
      * @return the DateMidnight instance
      */
     public DateMidnight toDateMidnight(DateTimeZone zone) {
         Chronology chrono = getChronology().withZone(zone);
         return new DateMidnight(getYear(), getMonthOfYear(), getDayOfMonth(), chrono);
     }
 
     //-----------------------------------------------------------------------
     /**
      * Converts this object to a DateTime using a TimeOfDay to fill in the
      * missing fields and using the default time zone.
      * This instance is immutable and unaffected by this method call.
      * <p>
      * The resulting chronology is determined by the chronology of this
      * YearMonthDay plus the time zone.
      * The chronology of the time is ignored - only the field values are used.
      *
      * @param time  the time of day to use, null means current time
      * @return the DateTime instance
      */
     public DateTime toDateTime(TimeOfDay time) {
         return toDateTime(time, null);
     }
 
     /**
      * Converts this object to a DateTime using a TimeOfDay to fill in the
      * missing fields.
      * This instance is immutable and unaffected by this method call.
      * <p>
      * The resulting chronology is determined by the chronology of this
      * YearMonthDay plus the time zone.
      * The chronology of the time is ignored - only the field values are used.
      *
      * @param time  the time of day to use, null means current time
      * @param zone  the zone to get the DateTime in, null means default
      * @return the DateTime instance
      */
     public DateTime toDateTime(TimeOfDay time, DateTimeZone zone) {
         Chronology chrono = getChronology().withZone(zone);
         long instant = DateTimeUtils.currentTimeMillis();
         instant = chrono.set(this, instant);
         if (time != null) {
             instant = chrono.set(time, instant);
         }
         return new DateTime(instant, chrono);
     }
 
     //-----------------------------------------------------------------------
     /**
      * Converts this object to an Interval representing the whole day
      * in the default time zone.
      *
      * @return a interval over the day
      */
     public Interval toInterval() {
         return toInterval(null);
     }
 
     /**
      * Converts this object to an Interval representing the whole day.
      *
      * @param zone  the zone to get the Interval in, null means default
      * @return a interval over the day
      */
     public Interval toInterval(DateTimeZone zone) {
         zone = DateTimeUtils.getZone(zone);
         return toDateMidnight(zone).toInterval();
     }
 
     //-----------------------------------------------------------------------
     /**
      * Get the year field value.
      *
      * @return the year
      */
     public int getYear() {
         return getValue(YEAR);
     }
 
     /**
      * Get the month of year field value.
      *
      * @return the month of year
      */
     public int getMonthOfYear() {
         return getValue(MONTH_OF_YEAR);
     }
 
     /**
      * Get the day of month field value.
      *
      * @return the day of month
      */
     public int getDayOfMonth() {
         return getValue(DAY_OF_MONTH);
     }
 
     //-----------------------------------------------------------------------
     /**
      * Returns a copy of this date with the year field updated.
      * <p>
      * YearMonthDay is immutable, so there are no set methods.
      * Instead, this method returns a new instance with the value of
      * year changed.
      *
      * @param year  the year to set
      * @return a copy of this object with the field set
      * @throws IllegalArgumentException if the value is invalid
      * @since 1.3
      */
     public YearMonthDay withYear(int year) {
         int[] newValues = getValues();
         newValues = getChronology().year().set(this, YEAR, newValues, year);
         return new YearMonthDay(this, newValues);
     }
 
     /**
      * Returns a copy of this date with the month of year field updated.
      * <p>
      * YearMonthDay is immutable, so there are no set methods.
      * Instead, this method returns a new instance with the value of
      * month of year changed.
      *
      * @param monthOfYear  the month of year to set
      * @return a copy of this object with the field set
      * @throws IllegalArgumentException if the value is invalid
      * @since 1.3
      */
     public YearMonthDay withMonthOfYear(int monthOfYear) {
         int[] newValues = getValues();
         newValues = getChronology().monthOfYear().set(this, MONTH_OF_YEAR, newValues, monthOfYear);
         return new YearMonthDay(this, newValues);
     }
 
     /**
      * Returns a copy of this date with the day of month field updated.
      * <p>
      * YearMonthDay is immutable, so there are no set methods.
      * Instead, this method returns a new instance with the value of
      * day of month changed.
      *
      * @param dayOfMonth  the day of month to set
      * @return a copy of this object with the field set
      * @throws IllegalArgumentException if the value is invalid
      * @since 1.3
      */
     public YearMonthDay withDayOfMonth(int dayOfMonth) {
         int[] newValues = getValues();
         newValues = getChronology().dayOfMonth().set(this, DAY_OF_MONTH, newValues, dayOfMonth);
         return new YearMonthDay(this, newValues);
     }
 
     //-----------------------------------------------------------------------
     /**
      * Get the year field property which provides access to advanced functionality.
      * 
      * @return the year property
      */
     public Property year() {
         return new Property(this, YEAR);
     }
 
     /**
      * Get the month of year field property which provides access to advanced functionality.
      * 
      * @return the month of year property
      */
     public Property monthOfYear() {
         return new Property(this, MONTH_OF_YEAR);
     }
 
     /**
      * Get the day of month field property which provides access to advanced functionality.
      * 
      * @return the day of month property
      */
     public Property dayOfMonth() {
         return new Property(this, DAY_OF_MONTH);
     }
 
     //-----------------------------------------------------------------------
     /**
      * Output the date in the ISO8601 format YYYY-MM-DD.
      * 
      * @return ISO8601 formatted string
      */
     public String toString() {
         return ISODateTimeFormat.yearMonthDay().print(this);
     }
 
     //-----------------------------------------------------------------------
     /**
      * The property class for <code>YearMonthDay</code>.
      * <p>
      * This class binds a <code>YearMonthDay</code> to a <code>DateTimeField</code>.
      * 
      * @author Stephen Colebourne
      * @since 1.0
      * @deprecated Use LocalDate which has a much better internal implementation
      */
     @Deprecated
     public static class Property extends AbstractPartialFieldProperty implements Serializable {
 
         /** Serialization version */
         private static final long serialVersionUID = 5727734012190224363L;
 
         /** The partial */
         private final YearMonthDay iYearMonthDay;
         /** The field index */
         private final int iFieldIndex;
 
         /**
          * Constructs a property.
          * 
          * @param partial  the partial instance
          * @param fieldIndex  the index in the partial
          */
         Property(YearMonthDay partial, int fieldIndex) {
             super();
             iYearMonthDay = partial;
             iFieldIndex = fieldIndex;
         }
 
         /**
          * Gets the field that this property uses.
          * 
          * @return the field
          */
         public DateTimeField getField() {
             return iYearMonthDay.getField(iFieldIndex);
         }
 
         /**
          * Gets the partial that this property belongs to.
          * 
          * @return the partial
          */
         protected ReadablePartial getReadablePartial() {
             return iYearMonthDay;
         }
 
         /**
          * Gets the partial that this property belongs to.
          * 
          * @return the partial
          */
         public YearMonthDay getYearMonthDay() {
             return iYearMonthDay;
         }
 
         /**
          * Gets the value of this field.
          * 
          * @return the field value
          */
         public int get() {
             return iYearMonthDay.getValue(iFieldIndex);
         }
 
         //-----------------------------------------------------------------------
         /**
          * Adds to the value of this field in a copy of this YearMonthDay.
          * <p>
          * The value will be added to this field. If the value is too large to be
          * added solely to this field then it will affect larger fields.
          * Smaller fields are unaffected.
          * <p>
          * If the result would be too large, beyond the maximum year, then an
          * IllegalArgumentException is thrown.
          * <p>
          * The YearMonthDay attached to this property is unchanged by this call.
          * Instead, a new instance is returned.
          * 
          * @param valueToAdd  the value to add to the field in the copy
          * @return a copy of the YearMonthDay with the field value changed
          * @throws IllegalArgumentException if the value isn't valid
          */
         public YearMonthDay addToCopy(int valueToAdd) {
             int[] newValues = iYearMonthDay.getValues();
             newValues = getField().add(iYearMonthDay, iFieldIndex, newValues, valueToAdd);
             return new YearMonthDay(iYearMonthDay, newValues);
         }
 
         /**
          * Adds to the value of this field in a copy of this YearMonthDay wrapping
          * within this field if the maximum value is reached.
          * <p>
          * The value will be added to this field. If the value is too large to be
          * added solely to this field then it wraps within this field.
          * Other fields are unaffected.
          * <p>
          * For example,
          * <code>2004-12-20</code> addWrapField one month returns <code>2004-01-20</code>.
          * <p>
          * The YearMonthDay attached to this property is unchanged by this call.
          * Instead, a new instance is returned.
          * 
          * @param valueToAdd  the value to add to the field in the copy
          * @return a copy of the YearMonthDay with the field value changed
          * @throws IllegalArgumentException if the value isn't valid
          */
         public YearMonthDay addWrapFieldToCopy(int valueToAdd) {
             int[] newValues = iYearMonthDay.getValues();
             newValues = getField().addWrapField(iYearMonthDay, iFieldIndex, newValues, valueToAdd);
             return new YearMonthDay(iYearMonthDay, newValues);
         }
 
         //-----------------------------------------------------------------------
         /**
          * Sets this field in a copy of the YearMonthDay.
          * <p>
          * The YearMonthDay attached to this property is unchanged by this call.
          * Instead, a new instance is returned.
          * 
          * @param value  the value to set the field in the copy to
          * @return a copy of the YearMonthDay with the field value changed
          * @throws IllegalArgumentException if the value isn't valid
          */
         public YearMonthDay setCopy(int value) {
             int[] newValues = iYearMonthDay.getValues();
             newValues = getField().set(iYearMonthDay, iFieldIndex, newValues, value);
             return new YearMonthDay(iYearMonthDay, newValues);
         }
 
         /**
          * Sets this field in a copy of the YearMonthDay to a parsed text value.
          * <p>
          * The YearMonthDay attached to this property is unchanged by this call.
          * Instead, a new instance is returned.
          * 
          * @param text  the text value to set
          * @param locale  optional locale to use for selecting a text symbol
          * @return a copy of the YearMonthDay with the field value changed
          * @throws IllegalArgumentException if the text value isn't valid
          */
         public YearMonthDay setCopy(String text, Locale locale) {
             int[] newValues = iYearMonthDay.getValues();
             newValues = getField().set(iYearMonthDay, iFieldIndex, newValues, text, locale);
             return new YearMonthDay(iYearMonthDay, newValues);
         }
 
         /**
          * Sets this field in a copy of the YearMonthDay to a parsed text value.
          * <p>
          * The YearMonthDay attached to this property is unchanged by this call.
          * Instead, a new instance is returned.
          * 
          * @param text  the text value to set
          * @return a copy of the YearMonthDay with the field value changed
          * @throws IllegalArgumentException if the text value isn't valid
          */
         public YearMonthDay setCopy(String text) {
             return setCopy(text, null);
         }
 
         //-----------------------------------------------------------------------
         /**
          * Returns a new YearMonthDay with this field set to the maximum value
          * for this field.
          * <p>
          * This operation is useful for obtaining a DateTime on the last day
          * of the month, as month lengths vary.
          * <pre>
          * YearMonthDay lastDayOfMonth = dt.dayOfMonth().withMaximumValue();
          * </pre>
          * <p>
          * The YearMonthDay attached to this property is unchanged by this call.
          *
          * @return a copy of the YearMonthDay with this field set to its maximum
          * @since 1.2
          */
         public YearMonthDay withMaximumValue() {
             return setCopy(getMaximumValue());
         }
 
         /**
          * Returns a new YearMonthDay with this field set to the minimum value
          * for this field.
          * <p>
          * The YearMonthDay attached to this property is unchanged by this call.
          *
          * @return a copy of the YearMonthDay with this field set to its minimum
          * @since 1.2
          */
         public YearMonthDay withMinimumValue() {
             return setCopy(getMinimumValue());
         }
     }
 
 }