org.joda.time
Class LocalDate

java.lang.Object
  org.joda.time.base.AbstractPartial
      org.joda.time.base.BaseLocal
          org.joda.time.LocalDate

All Implemented Interfaces:

Serializable, Comparable<ReadablePartial>, ReadablePartial

public final class LocalDate
extends BaseLocal
implements ReadablePartial, Serializable

LocalDate is an immutable datetime class representing a date without a time zone.

LocalDate implements the ReadablePartial interface. To do this, the interface methods focus on the key fields - Year, MonthOfYear and DayOfMonth. However, all date fields may in fact be queried.

LocalDate differs from DateMidnight in that this class does not have a time zone and does not represent a single instant in time.

Calculations on LocalDate are performed using a Chronology. This chronology will be set internally to be in the UTC time zone for all calculations.

Each individual field can be queried in two ways:

• getMonthOfYear()
• monthOfYear().get()

The second technique also provides access to other useful methods on the field:

• numeric value
• text value
• short text value
• maximum/minimum values
• add/subtract
• set
• rounding

LocalDate is thread-safe and immutable, provided that the Chronology is as well. All standard Chronology classes supplied are thread-safe and immutable.

Since:

1.3

Author:

Stephen Colebourne

See Also:

Serialized Form

Nested Class Summary

static class

LocalDate.Property LocalDate.Property binds a LocalDate to a DateTimeField allowing powerful datetime functionality to be easily accessed.

Constructor Summary

LocalDate()
Constructs an instance set to the current local time evaluated using ISO chronology in the default zone.

LocalDate(Chronology chronology)
Constructs an instance set to the current local time evaluated using specified chronology.

LocalDate(DateTimeZone zone)
Constructs an instance set to the current local time evaluated using ISO chronology in the specified zone.

LocalDate(int year, int monthOfYear, int dayOfMonth)
Constructs an instance set to the specified date and time using ISOChronology.

LocalDate(int year, int monthOfYear, int dayOfMonth, Chronology chronology)
Constructs an instance set to the specified date and time using the specified chronology, whose zone is ignored.

LocalDate(long instant)
Constructs an instance set to the local time defined by the specified instant evaluated using ISO chronology in the default zone.

LocalDate(long instant, Chronology chronology)
Constructs an instance set to the local time defined by the specified instant evaluated using the specified chronology.

LocalDate(long instant, DateTimeZone zone)
Constructs an instance set to the local time defined by the specified instant evaluated using ISO chronology in the specified zone.

LocalDate(Object instant)
Constructs an instance from an Object that represents a datetime.

LocalDate(Object instant, Chronology chronology)
Constructs an instance from an Object that represents a datetime, using the specified chronology.

LocalDate(Object instant, DateTimeZone zone)
Constructs an instance from an Object that represents a datetime, forcing the time zone to that specified.

Method Summary

LocalDate.Property	centuryOfEra() Get the century of era property which provides access to advanced functionality.
int	compareTo(ReadablePartial partial) Compares this partial with another returning an integer indicating the order.
LocalDate.Property	dayOfMonth() Get the day of month property which provides access to advanced functionality.
LocalDate.Property	dayOfWeek() Get the day of week property which provides access to advanced functionality.
LocalDate.Property	dayOfYear() Get the day of year property which provides access to advanced functionality.
boolean	equals(Object partial) Compares this ReadablePartial with another returning true if the chronology, field types and values are equal.
LocalDate.Property	era() Get the era property which provides access to advanced functionality.
static LocalDate	fromCalendarFields(Calendar calendar) Constructs a LocalDate from a java.util.Calendar using exactly the same field values.
static LocalDate	fromDateFields(Date date) Constructs a LocalDate from a java.util.Date using exactly the same field values.
int	get(DateTimeFieldType fieldType) Get the value of one of the fields of a datetime.
int	getCenturyOfEra() Get the year of era field value.
Chronology	getChronology() Gets the chronology of the date.
int	getDayOfMonth() Get the day of month field value.
int	getDayOfWeek() Get the day of week field value.
int	getDayOfYear() Get the day of year field value.
int	getEra() Get the era field value.
protected DateTimeField	getField(int index, Chronology chrono) Gets the field for a specific index in the chronology specified.
protected long	getLocalMillis() Gets the local milliseconds from the Java epoch of 1970-01-01T00:00:00 (not fixed to any specific time zone).
int	getMonthOfYear() Get the month of year field value.
int	getValue(int index) Gets the value of the field at the specifed index.
int	getWeekOfWeekyear() Get the week of weekyear field value.
int	getWeekyear() Get the weekyear field value.
int	getYear() Get the year field value.
int	getYearOfCentury() Get the year of century field value.
int	getYearOfEra() Get the year of era field value.
int	hashCode() Gets a hash code for the instant as defined in ReadablePartial.
boolean	isSupported(DateTimeFieldType type) Checks if the field type specified is supported by this local date and chronology.
boolean	isSupported(DurationFieldType type) Checks if the duration type specified is supported by this local date and chronology.
LocalDate	minus(ReadablePeriod period) Returns a copy of this date with the specified period taken away.
LocalDate	minusDays(int days) Returns a copy of this date minus the specified number of days.
LocalDate	minusMonths(int months) Returns a copy of this date minus the specified number of months.
LocalDate	minusWeeks(int weeks) Returns a copy of this date minus the specified number of weeks.
LocalDate	minusYears(int years) Returns a copy of this date minus the specified number of years.
LocalDate.Property	monthOfYear() Get the month of year property which provides access to advanced functionality.
static LocalDate	now() Obtains a LocalDate set to the current system millisecond time using ISOChronology in the default time zone.
static LocalDate	now(Chronology chronology) Obtains a LocalDate set to the current system millisecond time using the specified chronology.
static LocalDate	now(DateTimeZone zone) Obtains a LocalDate set to the current system millisecond time using ISOChronology in the specified time zone.
static LocalDate	parse(String str) Parses a LocalDate from the specified string.
static LocalDate	parse(String str, DateTimeFormatter formatter) Parses a LocalDate from the specified string using a formatter.
LocalDate	plus(ReadablePeriod period) Returns a copy of this date with the specified period added.
LocalDate	plusDays(int days) Returns a copy of this date plus the specified number of days.
LocalDate	plusMonths(int months) Returns a copy of this date plus the specified number of months.
LocalDate	plusWeeks(int weeks) Returns a copy of this date plus the specified number of weeks.
LocalDate	plusYears(int years) Returns a copy of this date plus the specified number of years.
LocalDate.Property	property(DateTimeFieldType fieldType) Gets the property object for the specified type, which contains many useful methods.
int	size() Gets the number of fields in this partial, which is three.
Date	toDate() Get the date time as a java.util.Date.
DateMidnight	toDateMidnight() Converts this LocalDate to a DateMidnight in the default time zone.
DateMidnight	toDateMidnight(DateTimeZone zone) Converts this LocalDate to a DateMidnight.
DateTime	toDateTime(LocalTime time) Converts this object to a DateTime using a LocalTime to fill in the missing fields and using the default time zone.
DateTime	toDateTime(LocalTime time, DateTimeZone zone) Converts this object to a DateTime using a LocalTime to fill in the missing fields.
DateTime	toDateTimeAtCurrentTime() Converts this LocalDate to a full datetime using the default time zone setting the date fields from this instance and the time fields from the current time.
DateTime	toDateTimeAtCurrentTime(DateTimeZone zone) Converts this LocalDate to a full datetime using the specified time zone setting the date fields from this instance and the time fields from the current time.
DateTime	toDateTimeAtMidnight() Deprecated. Use toDateTimeAtStartOfDay() which won't throw an exception
DateTime	toDateTimeAtMidnight(DateTimeZone zone) Deprecated. Use toDateTimeAtStartOfDay(DateTimeZone) which won't throw an exception
DateTime	toDateTimeAtStartOfDay() Converts this LocalDate to a full datetime at the earliest valid time for the date using the default time zone.
DateTime	toDateTimeAtStartOfDay(DateTimeZone zone) Converts this LocalDate to a full datetime at the earliest valid time for the date using the specified time zone.
Interval	toInterval() Converts this object to an Interval representing the whole day in the default time zone.
Interval	toInterval(DateTimeZone zone) Converts this object to an Interval representing the whole day.
LocalDateTime	toLocalDateTime(LocalTime time) Converts this object to a LocalDateTime using a LocalTime to fill in the missing fields.
String	toString() Output the date time in ISO8601 format (yyyy-MM-dd).
String	toString(String pattern) Output the date using the specified format pattern.
String	toString(String pattern, Locale locale) Output the date using the specified format pattern.
LocalDate.Property	weekOfWeekyear() Get the week of a week based year property which provides access to advanced functionality.
LocalDate.Property	weekyear() Get the weekyear property which provides access to advanced functionality.
LocalDate	withCenturyOfEra(int centuryOfEra) Returns a copy of this date with the century of era field updated.
LocalDate	withDayOfMonth(int dayOfMonth) Returns a copy of this date with the day of month field updated.
LocalDate	withDayOfWeek(int dayOfWeek) Returns a copy of this date with the day of week field updated.
LocalDate	withDayOfYear(int dayOfYear) Returns a copy of this date with the day of year field updated.
LocalDate	withEra(int era) Returns a copy of this date with the era field updated.
LocalDate	withField(DateTimeFieldType fieldType, int value) Returns a copy of this date with the specified field set to a new value.
LocalDate	withFieldAdded(DurationFieldType fieldType, int amount) Returns a copy of this date with the value of the specified field increased.
LocalDate	withFields(ReadablePartial partial) Returns a copy of this date with the partial set of fields replacing those from this instance.
LocalDate	withMonthOfYear(int monthOfYear) Returns a copy of this date with the month of year field updated.
LocalDate	withPeriodAdded(ReadablePeriod period, int scalar) Returns a copy of this date with the specified period added.
LocalDate	withWeekOfWeekyear(int weekOfWeekyear) Returns a copy of this date with the week of weekyear field updated.
LocalDate	withWeekyear(int weekyear) Returns a copy of this date with the weekyear field updated.
LocalDate	withYear(int year) Returns a copy of this date with the year field updated.
LocalDate	withYearOfCentury(int yearOfCentury) Returns a copy of this date with the year of century field updated.
LocalDate	withYearOfEra(int yearOfEra) Returns a copy of this date with the year of era field updated.
LocalDate.Property	year() Get the year property which provides access to advanced functionality.
LocalDate.Property	yearOfCentury() Get the year of century property which provides access to advanced functionality.
LocalDate.Property	yearOfEra() Get the year of era property which provides access to advanced functionality.

Methods inherited from class org.joda.time.base.AbstractPartial

getField, getFields, getFieldType, getFieldTypes, getValues, indexOf, indexOf, indexOfSupported, indexOfSupported, isAfter, isBefore, isEqual, toDateTime, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.joda.time.ReadablePartial

getField, getFieldType, toDateTime

Constructor Detail

LocalDate

public LocalDate()

Constructs an instance set to the current local time evaluated using ISO chronology in the default zone.

Once the constructor is completed, the zone is no longer used.

See Also:

now()

LocalDate

public LocalDate(DateTimeZone zone)

Constructs an instance set to the current local time evaluated using ISO chronology in the specified zone.

If the specified time zone is null, the default zone is used. Once the constructor is completed, the zone is no longer used.

Parameters:

zone - the time zone, null means default zone

See Also:

now(DateTimeZone)

LocalDate

public LocalDate(Chronology chronology)

Constructs an instance set to the current local time evaluated using specified chronology.

If the chronology is null, ISO chronology in the default time zone is used. Once the constructor is completed, the zone is no longer used.

Parameters:

chronology - the chronology, null means ISOChronology in default zone

See Also:

now(Chronology)

LocalDate

public LocalDate(long instant)

Constructs an instance set to the local time defined by the specified instant evaluated using ISO chronology in the default zone.

Once the constructor is completed, the zone is no longer used.

Parameters:

instant - the milliseconds from 1970-01-01T00:00:00Z

LocalDate

public LocalDate(long instant,
                 DateTimeZone zone)

Constructs an instance set to the local time defined by the specified instant evaluated using ISO chronology in the specified zone.

If the specified time zone is null, the default zone is used. Once the constructor is completed, the zone is no longer used.

Parameters:

instant - the milliseconds from 1970-01-01T00:00:00Z

zone - the time zone, null means default zone

LocalDate

public LocalDate(long instant,
                 Chronology chronology)

Constructs an instance set to the local time defined by the specified instant evaluated using the specified chronology.

If the chronology is null, ISO chronology in the default zone is used. Once the constructor is completed, the zone is no longer used.

Parameters:

instant - the milliseconds from 1970-01-01T00:00:00Z

chronology - the chronology, null means ISOChronology in default zone

LocalDate

public LocalDate(Object instant)

Constructs an instance from an Object that represents a datetime. The time zone will be retrieved from the object if possible, otherwise the default time zone will be used.

If the object contains no chronology, ISOChronology is used. Once the constructor is completed, the zone is no longer used.

The recognised object types are defined in ConverterManager and include ReadablePartial, ReadableInstant, String, Calendar and Date. The String formats are described by ISODateTimeFormat.localDateParser(). The default String converter ignores the zone and only parses the field values.

Parameters:

instant - the datetime object

Throws:

IllegalArgumentException - if the instant is invalid

LocalDate

public LocalDate(Object instant,
                 DateTimeZone zone)

Constructs an instance from an Object that represents a datetime, forcing the time zone to that specified.

If the object contains no chronology, ISOChronology is used. If the specified time zone is null, the default zone is used. Once the constructor is completed, the zone is no longer used.

The recognised object types are defined in ConverterManager and include ReadablePartial, ReadableInstant, String, Calendar and Date. The String formats are described by ISODateTimeFormat.localDateParser(). The default String converter ignores the zone and only parses the field values.

Parameters:

instant - the datetime object

zone - the time zone

Throws:

IllegalArgumentException - if the instant is invalid

LocalDate

public LocalDate(Object instant,
                 Chronology chronology)

Constructs an instance from an Object that represents a datetime, using the specified chronology.

If the chronology is null, ISO in the default time zone is used. Once the constructor is completed, the zone is no longer used. If the instant contains a chronology, it will be ignored. For example, passing a LocalDate and a different chronology will return a date with the year/month/day from the date applied unaltered to the specified chronology.

The recognised object types are defined in ConverterManager and include ReadablePartial, ReadableInstant, String, Calendar and Date. The String formats are described by ISODateTimeFormat.localDateParser(). The default String converter ignores the zone and only parses the field values.

Parameters:

instant - the datetime object

chronology - the chronology

Throws:

IllegalArgumentException - if the instant is invalid

LocalDate

public LocalDate(int year,
                 int monthOfYear,
                 int dayOfMonth)

Constructs an instance set to the specified date and time using ISOChronology.

Parameters:

year - the year

monthOfYear - the month of the year, from 1 to 12

dayOfMonth - the day of the month, from 1 to 31

LocalDate

public LocalDate(int year,
                 int monthOfYear,
                 int dayOfMonth,
                 Chronology chronology)

Constructs an instance set to the specified date and time using the specified chronology, whose zone is ignored.

If the chronology is null, ISOChronology is used.

Parameters:

year - the year, valid values defined by the chronology

monthOfYear - the month of the year, valid values defined by the chronology

dayOfMonth - the day of the month, valid values defined by the chronology

chronology - the chronology, null means ISOChronology in default zone

Method Detail

now

public static LocalDate now()

Obtains a LocalDate set to the current system millisecond time using ISOChronology in the default time zone.

Returns:

the current date-time, not null

Since:

2.0

now

public static LocalDate now(DateTimeZone zone)

Obtains a LocalDate set to the current system millisecond time using ISOChronology in the specified time zone.

Parameters:

zone - the time zone, not null

Returns:

the current date-time, not null

Since:

2.0

now

public static LocalDate now(Chronology chronology)

Obtains a LocalDate set to the current system millisecond time using the specified chronology.

Parameters:

chronology - the chronology, not null

Returns:

the current date-time, not null

Since:

2.0

parse

public static LocalDate parse(String str)

Parses a LocalDate from the specified string.

This uses ISODateTimeFormat.localDateParser().

Parameters:

str - the string to parse, not null

Since:

2.0

parse

public static LocalDate parse(String str,
                              DateTimeFormatter formatter)

Parses a LocalDate from the specified string using a formatter.

Parameters:

str - the string to parse, not null

formatter - the formatter to use, not null

Since:

2.0

fromCalendarFields

public static LocalDate fromCalendarFields(Calendar calendar)

Constructs a LocalDate from a java.util.Calendar using exactly the same field values.

Each field is queried from the Calendar and assigned to the LocalDate. This is useful if you have been using the Calendar as a local date, ignoring the zone.

One advantage of this method is that this method is unaffected if the version of the time zone data differs between the JDK and Joda-Time. That is because the local field values are transferred, calculated using the JDK time zone data and without using the Joda-Time time zone data.

This factory method ignores the type of the calendar and always creates a LocalDate with ISO chronology. It is expected that you will only pass in instances of GregorianCalendar however this is not validated.

Parameters:

calendar - the Calendar to extract fields from, not null

Returns:

the created local date, not null

Throws:

IllegalArgumentException - if the calendar is null

IllegalArgumentException - if the date is invalid for the ISO chronology

fromDateFields

public static LocalDate fromDateFields(Date date)

Constructs a LocalDate from a java.util.Date using exactly the same field values.

Each field is queried from the Date and assigned to the LocalDate. This is useful if you have been using the Date as a local date, ignoring the zone.

One advantage of this method is that this method is unaffected if the version of the time zone data differs between the JDK and Joda-Time. That is because the local field values are transferred, calculated using the JDK time zone data and without using the Joda-Time time zone data.

This factory method always creates a LocalDate with ISO chronology.

Parameters:

date - the Date to extract fields from, not null

Returns:

the created local date, not null

Throws:

IllegalArgumentException - if the calendar is null

IllegalArgumentException - if the date is invalid for the ISO chronology

size

public int size()

Gets the number of fields in this partial, which is three. The supported fields are Year, MonthOfYear and DayOfMonth. Note that all fields from day and above may in fact be queried via other methods.

Specified by:

size in interface ReadablePartial

Returns:

the field count, three

getField

protected DateTimeField getField(int index,
                                 Chronology chrono)

Gets the field for a specific index in the chronology specified.

This method must not use any instance variables.

Specified by:

getField in class AbstractPartial

Parameters:

index - the index to retrieve

chrono - the chronology to use

Returns:

the field

getValue

public int getValue(int index)

Gets the value of the field at the specifed index.

This method is required to support the ReadablePartial interface. The supported fields are Year, MonthOfYear and DayOfMonth. Note that all fields from day and above may in fact be queried via other methods.

Specified by:

getValue in interface ReadablePartial

Parameters:

index - the index, zero to two

Returns:

the value

Throws:

IndexOutOfBoundsException - if the index is invalid

get

public int get(DateTimeFieldType fieldType)

Get the value of one of the fields of a datetime.

This method gets the value of the specified field. For example:

 LocalDate dt = LocalDate.nowDefaultZone();
 int year = dt.get(DateTimeFieldType.year());
 

Specified by:

get in interface ReadablePartial

Overrides:

get in class AbstractPartial

Parameters:

fieldType - a field type, usually obtained from DateTimeFieldType, not null

Returns:

the value of that field

Throws:

IllegalArgumentException - if the field type is null or unsupported

isSupported

public boolean isSupported(DateTimeFieldType type)

Checks if the field type specified is supported by this local date and chronology. This can be used to avoid exceptions in get(DateTimeFieldType).

Specified by:

isSupported in interface ReadablePartial

Overrides:

isSupported in class AbstractPartial

Parameters:

type - a field type, usually obtained from DateTimeFieldType

Returns:

true if the field type is supported

isSupported

public boolean isSupported(DurationFieldType type)

Checks if the duration type specified is supported by this local date and chronology.

Parameters:

type - a duration type, usually obtained from DurationFieldType

Returns:

true if the field type is supported

getLocalMillis

protected long getLocalMillis()

Gets the local milliseconds from the Java epoch of 1970-01-01T00:00:00 (not fixed to any specific time zone).

Specified by:

getLocalMillis in class BaseLocal

Returns:

the number of milliseconds since 1970-01-01T00:00:00

Since:

1.5 (previously private)

getChronology

public Chronology getChronology()

Gets the chronology of the date.

Specified by:

getChronology in interface ReadablePartial

Returns:

the Chronology that the date is using

equals

public boolean equals(Object partial)

Compares this ReadablePartial with another returning true if the chronology, field types and values are equal.

Specified by:

equals in interface ReadablePartial

Overrides:

equals in class AbstractPartial

Parameters:

partial - an object to check against

Returns:

true if fields and values are equal

hashCode

public int hashCode()

Gets a hash code for the instant as defined in ReadablePartial.

Specified by:

hashCode in interface ReadablePartial

Overrides:

hashCode in class AbstractPartial

Returns:

a suitable hash code

compareTo

public int compareTo(ReadablePartial partial)

Compares this partial with another returning an integer indicating the order.

The fields are compared in order, from largest to smallest. The first field that is non-equal is used to determine the result.

The specified object must be a partial instance whose field types match those of this partial.

Specified by:

compareTo in interface Comparable<ReadablePartial>

Overrides:

compareTo in class AbstractPartial

Parameters:

partial - an object to check against

Returns:

negative if this is less, zero if equal, positive if greater

Throws:

ClassCastException - if the partial is the wrong class or if it has field types that don't match

NullPointerException - if the partial is null

toDateTimeAtStartOfDay

public DateTime toDateTimeAtStartOfDay()

Converts this LocalDate to a full datetime at the earliest valid time for the date using the default time zone.

The time will normally be midnight, as that is the earliest time on any given day. However, in some time zones when Daylight Savings Time starts, there is no midnight because time jumps from 11:59 to 01:00. This method handles that situation by returning 01:00 on that date.

This instance is immutable and unaffected by this method call.

Returns:

this date as a datetime at the start of the day

Since:

1.5

toDateTimeAtStartOfDay

public DateTime toDateTimeAtStartOfDay(DateTimeZone zone)

Converts this LocalDate to a full datetime at the earliest valid time for the date using the specified time zone.

The time will normally be midnight, as that is the earliest time on any given day. However, in some time zones when Daylight Savings Time starts, there is no midnight because time jumps from 11:59 to 01:00. This method handles that situation by returning 01:00 on that date.

This method uses the chronology from this instance plus the time zone specified.

This instance is immutable and unaffected by this method call.

Parameters:

zone - the zone to use, null means default zone

Returns:

this date as a datetime at the start of the day

Since:

1.5

toDateTimeAtMidnight

@Deprecated
public DateTime toDateTimeAtMidnight()

Deprecated. Use toDateTimeAtStartOfDay() which won't throw an exception

Converts this LocalDate to a full datetime at midnight using the default time zone.

This method will throw an exception if the default time zone switches to Daylight Savings Time at midnight and this LocalDate represents that switchover date. The problem is that there is no such time as midnight on the required date, and as such an exception is thrown.

This instance is immutable and unaffected by this method call.

Returns:

this date as a datetime at midnight

toDateTimeAtMidnight

@Deprecated
public DateTime toDateTimeAtMidnight(DateTimeZone zone)

Deprecated. Use toDateTimeAtStartOfDay(DateTimeZone) which won't throw an exception

Converts this LocalDate to a full datetime at midnight using the specified time zone.

This method will throw an exception if the time zone switches to Daylight Savings Time at midnight and this LocalDate represents that switchover date. The problem is that there is no such time as midnight on the required date, and as such an exception is thrown.

This method uses the chronology from this instance plus the time zone specified.

This instance is immutable and unaffected by this method call.

Parameters:

zone - the zone to use, null means default zone

Returns:

this date as a datetime at midnight

toDateTimeAtCurrentTime

public DateTime toDateTimeAtCurrentTime()

Converts this LocalDate to a full datetime using the default time zone setting the date fields from this instance and the time fields from the current time.

This method will throw an exception if the datetime that would be created does not exist when the time zone is taken into account.

This instance is immutable and unaffected by this method call.

Returns:

this date as a datetime with the time as the current time

toDateTimeAtCurrentTime

public DateTime toDateTimeAtCurrentTime(DateTimeZone zone)

Converts this LocalDate to a full datetime using the specified time zone setting the date fields from this instance and the time fields from the current time.

This method uses the chronology from this instance plus the time zone specified.

This method will throw an exception if the datetime that would be created does not exist when the time zone is taken into account.

This instance is immutable and unaffected by this method call.

Parameters:

zone - the zone to use, null means default zone

Returns:

this date as a datetime with the time as the current time

toDateMidnight

public DateMidnight toDateMidnight()

Converts this LocalDate to a DateMidnight in the default time zone.

As from v1.5, you are recommended to avoid DateMidnight and use toDateTimeAtStartOfDay() instead because of the exception detailed below.

This method will throw an exception if the default time zone switches to Daylight Savings Time at midnight and this LocalDate represents that switchover date. The problem is that there is no such time as midnight on the required date, and as such an exception is thrown.

This instance is immutable and unaffected by this method call.

Returns:

the DateMidnight instance in the default zone

toDateMidnight

public DateMidnight toDateMidnight(DateTimeZone zone)

Converts this LocalDate to a DateMidnight.

As from v1.5, you are recommended to avoid DateMidnight and use toDateTimeAtStartOfDay() instead because of the exception detailed below.

This method will throw an exception if the time zone switches to Daylight Savings Time at midnight and this LocalDate represents that switchover date. The problem is that there is no such time as midnight on the required date, and as such an exception is thrown.

This instance is immutable and unaffected by this method call.

Parameters:

zone - the zone to get the DateMidnight in, null means default zone

Returns:

the DateMidnight instance

toLocalDateTime

public LocalDateTime toLocalDateTime(LocalTime time)

Converts this object to a LocalDateTime using a LocalTime to fill in the missing fields.

The resulting chronology is determined by the chronology of this LocalDate. The chronology of the time must also match. If the time is null an exception is thrown.

This instance is immutable and unaffected by this method call.

Parameters:

time - the time of day to use, must not be null

Returns:

the LocalDateTime instance

Throws:

IllegalArgumentException - if the time is null

IllegalArgumentException - if the chronology of the time does not match

Since:

1.5

toDateTime

public DateTime toDateTime(LocalTime time)

Converts this object to a DateTime using a LocalTime to fill in the missing fields and using the default time zone.

The resulting chronology is determined by the chronology of this LocalDate. The chronology of the time must match. If the time is null, the current time in the date's chronology is used.

This method will throw an exception if the datetime that would be created does not exist when the time zone is taken into account.

This instance is immutable and unaffected by this method call.

Parameters:

time - the time of day to use, null means current time

Returns:

the DateTime instance

Throws:

IllegalArgumentException - if the chronology of the time does not match

toDateTime

public DateTime toDateTime(LocalTime time,
                           DateTimeZone zone)

Converts this object to a DateTime using a LocalTime to fill in the missing fields.

The resulting chronology is determined by the chronology of this LocalDate plus the time zone. The chronology of the time must match. If the time is null, the current time in the date's chronology is used.

This method will throw an exception if the datetime that would be created does not exist when the time zone is taken into account.

This instance is immutable and unaffected by this method call.

Parameters:

time - the time of day to use, null means current time

zone - the zone to get the DateTime in, null means default

Returns:

the DateTime instance

Throws:

IllegalArgumentException - if the chronology of the time does not match

toInterval

public Interval toInterval()

Converts this object to an Interval representing the whole day in the default time zone.

The interval may have more or less than 24 hours if this is a daylight savings cutover date.

This instance is immutable and unaffected by this method call.

Returns:

a interval over the day

toInterval

public Interval toInterval(DateTimeZone zone)

Converts this object to an Interval representing the whole day.

The interval may have more or less than 24 hours if this is a daylight savings cutover date.

This instance is immutable and unaffected by this method call.

Parameters:

zone - the zone to get the Interval in, null means default

Returns:

a interval over the day

toDate

public Date toDate()

Get the date time as a java.util.Date.

The Date object created has exactly the same year, month and day as this date. The time will be set to the earliest valid time for that date.

Converting to a JDK Date is full of complications as the JDK Date constructor doesn't behave as you might expect around DST transitions. This method works by taking a first guess and then adjusting the JDK date until it has the earliest valid instant. This also handles the situation where the JDK time zone data differs from the Joda-Time time zone data.

Returns:

a Date initialised with this date, never null

Since:

2.0

withFields

public LocalDate withFields(ReadablePartial partial)

Returns a copy of this date with the partial set of fields replacing those from this instance.

For example, if the partial contains a year and a month then those two fields will be changed in the returned instance. Unsupported fields are ignored. If the partial is null, then this is returned.

Parameters:

partial - the partial set of fields to apply to this date, null ignored

Returns:

a copy of this date with a different set of fields

Throws:

IllegalArgumentException - if any value is invalid

withField

public LocalDate withField(DateTimeFieldType fieldType,
                           int value)

Returns a copy of this date with the specified field set to a new value.

For example, if the field type is monthOfYear then the month of year field will be changed in the returned instance. If the field type is null, then this is returned.

These two lines are equivalent:

 LocalDate updated = dt.withDayOfMonth(6);
 LocalDate updated = dt.withField(DateTimeFieldType.dayOfMonth(), 6);
 

Parameters:

fieldType - the field type to set, not null

value - the value to set

Returns:

a copy of this date with the field set

Throws:

IllegalArgumentException - if the field is null or unsupported

withFieldAdded

public LocalDate withFieldAdded(DurationFieldType fieldType,
                                int amount)

Returns a copy of this date with the value of the specified field increased.

If the addition is zero or the field is null, then this is returned.

These three lines are equivalent:

 LocalDate added = dt.withFieldAdded(DurationFieldType.years(), 6);
 LocalDate added = dt.plusYears(6);
 LocalDate added = dt.plus(Period.years(6));
 

Parameters:

fieldType - the field type to add to, not null

amount - the amount to add

Returns:

a copy of this date with the field updated

Throws:

IllegalArgumentException - if the field is null or unsupported

ArithmeticException - if the result exceeds the internal capacity

withPeriodAdded

public LocalDate withPeriodAdded(ReadablePeriod period,
                                 int scalar)

Returns a copy of this date with the specified period added.

If the addition is zero, then this is returned.

This method is typically used to add multiple copies of complex period instances. Adding one field is best achieved using methods like withFieldAdded(DurationFieldType, int) or plusYears(int).

Unsupported time fields are ignored, thus adding a period of 24 hours will not have any effect.

Parameters:

period - the period to add to this one, null means zero

scalar - the amount of times to add, such as -1 to subtract once

Returns:

a copy of this date with the period added

Throws:

ArithmeticException - if the result exceeds the internal capacity

plus

public LocalDate plus(ReadablePeriod period)

Returns a copy of this date with the specified period added.

If the amount is zero or null, then this is returned.

This method is typically used to add complex period instances. Adding one field is best achieved using methods like plusYears(int).

Unsupported time fields are ignored, thus adding a period of 24 hours will not have any effect.

Parameters:

period - the period to add to this one, null means zero

Returns:

a copy of this date with the period added

Throws:

ArithmeticException - if the result exceeds the internal capacity

plusYears

public LocalDate plusYears(int years)

Returns a copy of this date plus the specified number of years.

This adds the specified number of years to the date. If adding years makes the day-of-month invalid, it is adjusted to the last valid day in the month. This LocalDate instance is immutable and unaffected by this method call.

The following three lines are identical in effect:

 LocalDate added = dt.plusYears(6);
 LocalDate added = dt.plus(Period.years(6));
 LocalDate added = dt.withFieldAdded(DurationFieldType.years(), 6);
 

Parameters:

years - the amount of years to add, may be negative

Returns:

the new LocalDate plus the increased years

plusMonths

public LocalDate plusMonths(int months)

Returns a copy of this date plus the specified number of months.

This adds the specified number of months to the date. The addition may change the year, but the day-of-month is normally unchanged. If adding months makes the day-of-month invalid, it is adjusted to the last valid day in the month. This LocalDate instance is immutable and unaffected by this method call.

The following three lines are identical in effect:

 LocalDate added = dt.plusMonths(6);
 LocalDate added = dt.plus(Period.months(6));
 LocalDate added = dt.withFieldAdded(DurationFieldType.months(), 6);
 

Parameters:

months - the amount of months to add, may be negative

Returns:

the new LocalDate plus the increased months

plusWeeks

public LocalDate plusWeeks(int weeks)

Returns a copy of this date plus the specified number of weeks.

This LocalDate instance is immutable and unaffected by this method call.

The following three lines are identical in effect:

 LocalDate added = dt.plusWeeks(6);
 LocalDate added = dt.plus(Period.weeks(6));
 LocalDate added = dt.withFieldAdded(DurationFieldType.weeks(), 6);
 

Parameters:

weeks - the amount of weeks to add, may be negative

Returns:

the new LocalDate plus the increased weeks

plusDays

public LocalDate plusDays(int days)

Returns a copy of this date plus the specified number of days.

This LocalDate instance is immutable and unaffected by this method call.

The following three lines are identical in effect:

 LocalDate added = dt.plusDays(6);
 LocalDate added = dt.plus(Period.days(6));
 LocalDate added = dt.withFieldAdded(DurationFieldType.days(), 6);
 

Parameters:

days - the amount of days to add, may be negative

Returns:

the new LocalDate plus the increased days

minus

public LocalDate minus(ReadablePeriod period)

Returns a copy of this date with the specified period taken away.

If the amount is zero or null, then this is returned.

This method is typically used to subtract complex period instances. Subtracting one field is best achieved using methods like minusYears(int).

Unsupported time fields are ignored, thus subtracting a period of 24 hours will not have any effect.

Parameters:

period - the period to reduce this instant by

Returns:

a copy of this LocalDate with the period taken away

Throws:

ArithmeticException - if the result exceeds the internal capacity

minusYears

public LocalDate minusYears(int years)

Returns a copy of this date minus the specified number of years.

This subtracts the specified number of years from the date. If subtracting years makes the day-of-month invalid, it is adjusted to the last valid day in the month. This LocalDate instance is immutable and unaffected by this method call.

The following three lines are identical in effect:

 LocalDate subtracted = dt.minusYears(6);
 LocalDate subtracted = dt.minus(Period.years(6));
 LocalDate subtracted = dt.withFieldAdded(DurationFieldType.years(), -6);
 

Parameters:

years - the amount of years to subtract, may be negative

Returns:

the new LocalDate minus the increased years

minusMonths

public LocalDate minusMonths(int months)

Returns a copy of this date minus the specified number of months.

This subtracts the specified number of months from the date. The subtraction may change the year, but the day-of-month is normally unchanged. If subtracting months makes the day-of-month invalid, it is adjusted to the last valid day in the month. This LocalDate instance is immutable and unaffected by this method call.

The following three lines are identical in effect:

 LocalDate subtracted = dt.minusMonths(6);
 LocalDate subtracted = dt.minus(Period.months(6));
 LocalDate subtracted = dt.withFieldAdded(DurationFieldType.months(), -6);
 

Parameters:

months - the amount of months to subtract, may be negative

Returns:

the new LocalDate minus the increased months

minusWeeks

public LocalDate minusWeeks(int weeks)

Returns a copy of this date minus the specified number of weeks.

This LocalDate instance is immutable and unaffected by this method call.

The following three lines are identical in effect:

 LocalDate subtracted = dt.minusWeeks(6);
 LocalDate subtracted = dt.minus(Period.weeks(6));
 LocalDate subtracted = dt.withFieldAdded(DurationFieldType.weeks(), -6);
 

Parameters:

weeks - the amount of weeks to subtract, may be negative

Returns:

the new LocalDate minus the increased weeks

minusDays

public LocalDate minusDays(int days)

Returns a copy of this date minus the specified number of days.

This LocalDate instance is immutable and unaffected by this method call.

The following three lines are identical in effect:

 LocalDate subtracted = dt.minusDays(6);
 LocalDate subtracted = dt.minus(Period.days(6));
 LocalDate subtracted = dt.withFieldAdded(DurationFieldType.days(), -6);
 

Parameters:

days - the amount of days to subtract, may be negative

Returns:

the new LocalDate minus the increased days

property

public LocalDate.Property property(DateTimeFieldType fieldType)

Gets the property object for the specified type, which contains many useful methods.

Parameters:

fieldType - the field type to get the chronology for

Returns:

the property object

Throws:

IllegalArgumentException - if the field is null or unsupported

getEra

public int getEra()

Get the era field value.

Returns:

the era

getCenturyOfEra

public int getCenturyOfEra()

Get the year of era field value.

Returns:

the year of era

getYearOfEra

public int getYearOfEra()

Get the year of era field value.

Returns:

the year of era

getYearOfCentury

public int getYearOfCentury()

Get the year of century field value.

Returns:

the year of century

getYear

public int getYear()

Get the year field value.

Returns:

the year

getWeekyear

public int getWeekyear()

Get the weekyear field value.

The weekyear is the year that matches with the weekOfWeekyear field. In the standard ISO8601 week algorithm, the first week of the year is that in which at least 4 days are in the year. As a result of this definition, day 1 of the first week may be in the previous year. The weekyear allows you to query the effective year for that day.

Returns:

the weekyear

getMonthOfYear

public int getMonthOfYear()

Get the month of year field value.

Returns:

the month of year

getWeekOfWeekyear

public int getWeekOfWeekyear()

Get the week of weekyear field value.

This field is associated with the "weekyear" via getWeekyear(). In the standard ISO8601 week algorithm, the first week of the year is that in which at least 4 days are in the year. As a result of this definition, day 1 of the first week may be in the previous year.

Returns:

the week of a week based year

getDayOfYear

public int getDayOfYear()

Get the day of year field value.

Returns:

the day of year

getDayOfMonth

public int getDayOfMonth()

Get the day of month field value.

The values for the day of month are defined in DateTimeConstants.

Returns:

the day of month

getDayOfWeek

public int getDayOfWeek()

Get the day of week field value.

The values for the day of week are defined in DateTimeConstants.

Returns:

the day of week

withEra

public LocalDate withEra(int era)

Returns a copy of this date with the era field updated.

LocalDate is immutable, so there are no set methods. Instead, this method returns a new instance with the value of era changed.

Parameters:

era - the era to set

Returns:

a copy of this object with the field set

Throws:

IllegalArgumentException - if the value is invalid

withCenturyOfEra

public LocalDate withCenturyOfEra(int centuryOfEra)

Returns a copy of this date with the century of era field updated.

LocalDate is immutable, so there are no set methods. Instead, this method returns a new instance with the value of century of era changed.

Parameters:

centuryOfEra - the centurey of era to set

Returns:

a copy of this object with the field set

Throws:

IllegalArgumentException - if the value is invalid

withYearOfEra

public LocalDate withYearOfEra(int yearOfEra)

Returns a copy of this date with the year of era field updated.

LocalDate is immutable, so there are no set methods. Instead, this method returns a new instance with the value of year of era changed.

Parameters:

yearOfEra - the year of era to set

Returns:

a copy of this object with the field set

Throws:

IllegalArgumentException - if the value is invalid

withYearOfCentury

public LocalDate withYearOfCentury(int yearOfCentury)

Returns a copy of this date with the year of century field updated.

LocalDate is immutable, so there are no set methods. Instead, this method returns a new instance with the value of year of century changed.

Parameters:

yearOfCentury - the year of century to set

Returns:

a copy of this object with the field set

Throws:

IllegalArgumentException - if the value is invalid

withYear

public LocalDate withYear(int year)

Returns a copy of this date with the year field updated.

LocalDate is immutable, so there are no set methods. Instead, this method returns a new instance with the value of year changed.

Parameters:

year - the year to set

Returns:

a copy of this object with the field set

Throws:

IllegalArgumentException - if the value is invalid

withWeekyear

public LocalDate withWeekyear(int weekyear)

Returns a copy of this date with the weekyear field updated.

The weekyear is the year that matches with the weekOfWeekyear field. In the standard ISO8601 week algorithm, the first week of the year is that in which at least 4 days are in the year. As a result of this definition, day 1 of the first week may be in the previous year. The weekyear allows you to query the effective year for that day.

LocalDate is immutable, so there are no set methods. Instead, this method returns a new instance with the value of weekyear changed.

Parameters:

weekyear - the weekyear to set

Returns:

a copy of this object with the field set

Throws:

IllegalArgumentException - if the value is invalid

withMonthOfYear

public LocalDate withMonthOfYear(int monthOfYear)

Returns a copy of this date with the month of year field updated.

LocalDate is immutable, so there are no set methods. Instead, this method returns a new instance with the value of month of year changed.

Parameters:

monthOfYear - the month of year to set

Returns:

a copy of this object with the field set

Throws:

IllegalArgumentException - if the value is invalid

withWeekOfWeekyear

public LocalDate withWeekOfWeekyear(int weekOfWeekyear)

Returns a copy of this date with the week of weekyear field updated.

This field is associated with the "weekyear" via withWeekyear(int). In the standard ISO8601 week algorithm, the first week of the year is that in which at least 4 days are in the year. As a result of this definition, day 1 of the first week may be in the previous year.

LocalDate is immutable, so there are no set methods. Instead, this method returns a new instance with the value of week of weekyear changed.

Parameters:

weekOfWeekyear - the week of weekyear to set

Returns:

a copy of this object with the field set

Throws:

IllegalArgumentException - if the value is invalid

withDayOfYear

public LocalDate withDayOfYear(int dayOfYear)

Returns a copy of this date with the day of year field updated.

LocalDate is immutable, so there are no set methods. Instead, this method returns a new instance with the value of day of year changed.

Parameters:

dayOfYear - the day of year to set

Returns:

a copy of this object with the field set

Throws:

IllegalArgumentException - if the value is invalid

withDayOfMonth

public LocalDate withDayOfMonth(int dayOfMonth)

Returns a copy of this date with the day of month field updated.

LocalDate is immutable, so there are no set methods. Instead, this method returns a new instance with the value of day of month changed.

Parameters:

dayOfMonth - the day of month to set

Returns:

a copy of this object with the field set

Throws:

IllegalArgumentException - if the value is invalid

withDayOfWeek

public LocalDate withDayOfWeek(int dayOfWeek)

Returns a copy of this date with the day of week field updated.

LocalDate is immutable, so there are no set methods. Instead, this method returns a new instance with the value of day of week changed.

Parameters:

dayOfWeek - the day of week to set

Returns:

a copy of this object with the field set

Throws:

IllegalArgumentException - if the value is invalid

era

public LocalDate.Property era()

Get the era property which provides access to advanced functionality.

Returns:

the era property

centuryOfEra

public LocalDate.Property centuryOfEra()

Get the century of era property which provides access to advanced functionality.

Returns:

the year of era property

yearOfCentury

public LocalDate.Property yearOfCentury()

Get the year of century property which provides access to advanced functionality.

Returns:

the year of era property

yearOfEra

public LocalDate.Property yearOfEra()

Get the year of era property which provides access to advanced functionality.

Returns:

the year of era property

year

public LocalDate.Property year()

Get the year property which provides access to advanced functionality.

Returns:

the year property

weekyear

public LocalDate.Property weekyear()

Get the weekyear property which provides access to advanced functionality.

Returns:

the weekyear property

monthOfYear

public LocalDate.Property monthOfYear()

Get the month of year property which provides access to advanced functionality.

Returns:

the month of year property

weekOfWeekyear

public LocalDate.Property weekOfWeekyear()

Get the week of a week based year property which provides access to advanced functionality.

Returns:

the week of a week based year property

dayOfYear

public LocalDate.Property dayOfYear()

Get the day of year property which provides access to advanced functionality.

Returns:

the day of year property

dayOfMonth

public LocalDate.Property dayOfMonth()

Get the day of month property which provides access to advanced functionality.

Returns:

the day of month property

dayOfWeek

public LocalDate.Property dayOfWeek()

Get the day of week property which provides access to advanced functionality.

Returns:

the day of week property

toString

public String toString()

Output the date time in ISO8601 format (yyyy-MM-dd).

Specified by:

toString in interface ReadablePartial

Overrides:

toString in class Object

Returns:

ISO8601 time formatted string.

toString

public String toString(String pattern)

Output the date using the specified format pattern.

Parameters:

pattern - the pattern specification, null means use toString

See Also:

DateTimeFormat

toString

public String toString(String pattern,
                       Locale locale)
                throws IllegalArgumentException

Output the date using the specified format pattern.

Parameters:

pattern - the pattern specification, null means use toString

locale - Locale to use, null means default

Throws:

IllegalArgumentException

See Also:

DateTimeFormat