# YearMonth

public final class **YearMonth** extends [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)  
implements [Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html) [TemporalAdjuster](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAdjuster.html) [Comparable](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Comparable.html)\<[YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)\> [Serializable](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/Serializable.html) A year-month in the ISO-8601 calendar system, such as `2007-12`.


`YearMonth` is an immutable date-time object that represents the combination
of a year and month. Any field that can be derived from a year and month, such as
quarter-of-year, can be obtained.


This class does not store or represent a day, time or time-zone.
For example, the value "October 2007" can be stored in a `YearMonth`.


The ISO-8601 calendar system is the modern civil calendar system used today
in most of the world. It is equivalent to the proleptic Gregorian calendar
system, in which today's rules for leap years are applied for all time.
For most applications written today, the ISO-8601 rules are entirely suitable.
However, any application that makes use of historical dates, and requires them
to be accurate will find the ISO-8601 approach unsuitable.

### Public Method Summary

|---|---|
| [Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html) | [adjustInto](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#adjustInto(java.time.temporal.Temporal))([Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html) temporal) Adjusts the specified temporal object to have this year-month. |
| [LocalDate](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/LocalDate.html) | [atDay](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#atDay(int))(int dayOfMonth) Combines this year-month with a day-of-month to create a `LocalDate`. |
| [LocalDate](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/LocalDate.html) | [atEndOfMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#atEndOfMonth())() Returns a `LocalDate` at the end of the month. |
| int | [compareTo](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#compareTo(java.time.YearMonth))([YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) other) Compares this year-month to another year-month. |
| boolean | [equals](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#equals(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) obj) Checks if this year-month is equal to another year-month. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [format](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#format(java.time.format.DateTimeFormatter))([DateTimeFormatter](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/format/DateTimeFormatter.html) formatter) Formats this year-month using the specified formatter. |
| static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [from](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#from(java.time.temporal.TemporalAccessor))([TemporalAccessor](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAccessor.html) temporal) Obtains an instance of `YearMonth` from a temporal object. |
| int | [get](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#get(java.time.temporal.TemporalField))([TemporalField](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalField.html) field) Gets the value of the specified field from this year-month as an `int`. |
| long | [getLong](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#getLong(java.time.temporal.TemporalField))([TemporalField](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalField.html) field) Gets the value of the specified field from this year-month as a `long`. |
| [Month](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/Month.html) | [getMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#getMonth())() Gets the month-of-year field using the `Month` enum. |
| int | [getMonthValue](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#getMonthValue())() Gets the month-of-year field from 1 to 12. |
| int | [getYear](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#getYear())() Gets the year field. |
| int | [hashCode](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#hashCode())() A hash code for this year-month. |
| boolean | [isAfter](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#isAfter(java.time.YearMonth))([YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) other) Checks if this year-month is after the specified year-month. |
| boolean | [isBefore](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#isBefore(java.time.YearMonth))([YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) other) Checks if this year-month is before the specified year-month. |
| boolean | [isLeapYear](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#isLeapYear())() Checks if the year is a leap year, according to the ISO proleptic calendar system rules. |
| boolean | [isSupported](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#isSupported(java.time.temporal.TemporalUnit))([TemporalUnit](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalUnit.html) unit) Checks if the specified unit is supported. |
| boolean | [isSupported](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#isSupported(java.time.temporal.TemporalField))([TemporalField](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalField.html) field) Checks if the specified field is supported. |
| boolean | [isValidDay](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#isValidDay(int))(int dayOfMonth) Checks if the day-of-month is valid for this year-month. |
| int | [lengthOfMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#lengthOfMonth())() Returns the length of the month, taking account of the year. |
| int | [lengthOfYear](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#lengthOfYear())() Returns the length of the year. |
| [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [minus](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#minus(java.time.temporal.TemporalAmount))([TemporalAmount](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAmount.html) amountToSubtract) Returns a copy of this year-month with the specified amount subtracted. |
| [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [minus](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#minus(long,%20java.time.temporal.TemporalUnit))(long amountToSubtract, [TemporalUnit](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalUnit.html) unit) Returns a copy of this year-month with the specified amount subtracted. |
| [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [minusMonths](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#minusMonths(long))(long monthsToSubtract) Returns a copy of this `YearMonth` with the specified number of months subtracted. |
| [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [minusYears](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#minusYears(long))(long yearsToSubtract) Returns a copy of this `YearMonth` with the specified number of years subtracted. |
| static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [now](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#now(java.time.ZoneId))([ZoneId](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/ZoneId.html) zone) Obtains the current year-month from the system clock in the specified time-zone. |
| static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [now](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#now())() Obtains the current year-month from the system clock in the default time-zone. |
| static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [now](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#now(java.time.Clock))([Clock](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/Clock.html) clock) Obtains the current year-month from the specified clock. |
| static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [of](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#of(int,%20java.time.Month))(int year, [Month](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/Month.html) month) Obtains an instance of `YearMonth` from a year and month. |
| static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [of](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#of(int,%20int))(int year, int month) Obtains an instance of `YearMonth` from a year and month. |
| static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [parse](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#parse(java.lang.CharSequence,%20java.time.format.DateTimeFormatter))([CharSequence](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/CharSequence.html) text, [DateTimeFormatter](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/format/DateTimeFormatter.html) formatter) Obtains an instance of `YearMonth` from a text string using a specific formatter. |
| static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [parse](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#parse(java.lang.CharSequence))([CharSequence](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/CharSequence.html) text) Obtains an instance of `YearMonth` from a text string such as `2007-12`. |
| [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [plus](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#plus(java.time.temporal.TemporalAmount))([TemporalAmount](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAmount.html) amountToAdd) Returns a copy of this year-month with the specified amount added. |
| [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [plus](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#plus(long,%20java.time.temporal.TemporalUnit))(long amountToAdd, [TemporalUnit](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalUnit.html) unit) Returns a copy of this year-month with the specified amount added. |
| [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [plusMonths](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#plusMonths(long))(long monthsToAdd) Returns a copy of this `YearMonth` with the specified number of months added. |
| [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [plusYears](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#plusYears(long))(long yearsToAdd) Returns a copy of this `YearMonth` with the specified number of years added. |
| \<R\> R | [query](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#query(java.time.temporal.TemporalQuery<R>))([TemporalQuery](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalQuery.html)\<R\> query) Queries this year-month using the specified query. |
| [ValueRange](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/ValueRange.html) | [range](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#range(java.time.temporal.TemporalField))([TemporalField](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalField.html) field) Gets the range of valid values for the specified field. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [toString](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#toString())() Outputs this year-month as a `String`, such as `2007-12`. |
| long | [until](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#until(java.time.temporal.Temporal,%20java.time.temporal.TemporalUnit))([Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html) endExclusive, [TemporalUnit](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalUnit.html) unit) Calculates the amount of time until another year-month in terms of the specified unit. |
| [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [with](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#with(java.time.temporal.TemporalField,%20long))([TemporalField](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalField.html) field, long newValue) Returns a copy of this year-month with the specified field set to a new value. |
| [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [with](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#with(java.time.temporal.TemporalAdjuster))([TemporalAdjuster](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAdjuster.html) adjuster) Returns an adjusted copy of this year-month. |
| [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [withMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#withMonth(int))(int month) Returns a copy of this `YearMonth` with the month-of-year altered. |
| [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) | [withYear](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#withYear(int))(int year) Returns a copy of this `YearMonth` with the year altered. |

### Inherited Method Summary

From class [java.lang.Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)

|---|---|
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [clone](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#clone())() Creates and returns a copy of this `Object`. |
| boolean | [equals](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#equals(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) obj) Compares this instance with the specified object and indicates if they are equal. |
| void | [finalize](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#finalize())() Invoked when the garbage collector has detected that this instance is no longer reachable. |
| final [Class](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Class.html)\<?\> | [getClass](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#getClass())() Returns the unique instance of `https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Class.html` that represents this object's class. |
| int | [hashCode](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#hashCode())() Returns an integer hash code for this object. |
| final void | [notify](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#notify())() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up. |
| final void | [notifyAll](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#notifyAll())() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [toString](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#toString())() Returns a string containing a concise, human-readable description of this object. |
| final void | [wait](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#wait(long,%20int))(long timeout, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires. |
| final void | [wait](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#wait(long))(long timeout) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires. |
| final void | [wait](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#wait())() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object. |

From interface [java.time.temporal.Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html)

|---|---|
| abstract boolean | [isSupported](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html#isSupported(java.time.temporal.TemporalUnit))([TemporalUnit](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalUnit.html) unit) Checks if the specified unit is supported. |
| [Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html) | [minus](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html#minus(java.time.temporal.TemporalAmount))([TemporalAmount](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAmount.html) amount) Returns an object of the same type as this object with an amount subtracted. |
| [Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html) | [minus](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html#minus(long,%20java.time.temporal.TemporalUnit))(long amountToSubtract, [TemporalUnit](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalUnit.html) unit) Returns an object of the same type as this object with the specified period subtracted. |
| abstract [Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html) | [plus](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html#plus(long,%20java.time.temporal.TemporalUnit))(long amountToAdd, [TemporalUnit](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalUnit.html) unit) Returns an object of the same type as this object with the specified period added. |
| [Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html) | [plus](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html#plus(java.time.temporal.TemporalAmount))([TemporalAmount](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAmount.html) amount) Returns an object of the same type as this object with an amount added. |
| abstract long | [until](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html#until(java.time.temporal.Temporal,%20java.time.temporal.TemporalUnit))([Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html) endExclusive, [TemporalUnit](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalUnit.html) unit) Calculates the amount of time until another temporal in terms of the specified unit. |
| abstract [Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html) | [with](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html#with(java.time.temporal.TemporalField,%20long))([TemporalField](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalField.html) field, long newValue) Returns an object of the same type as this object with the specified field altered. |
| [Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html) | [with](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html#with(java.time.temporal.TemporalAdjuster))([TemporalAdjuster](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAdjuster.html) adjuster) Returns an adjusted object of the same type as this object with the adjustment made. |

From interface [java.time.temporal.TemporalAdjuster](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAdjuster.html)

|---|---|
| abstract [Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html) | [adjustInto](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAdjuster.html#adjustInto(java.time.temporal.Temporal))([Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html) temporal) Adjusts the specified temporal object. |

From interface [java.lang.Comparable](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Comparable.html)

|---|---|
| abstract int | [compareTo](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Comparable.html#compareTo(T))([YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) o) Compares this object with the specified object for order. |

From interface [java.time.temporal.TemporalAccessor](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAccessor.html)

|---|---|
| int | [get](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAccessor.html#get(java.time.temporal.TemporalField))([TemporalField](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalField.html) field) Gets the value of the specified field as an `int`. |
| abstract long | [getLong](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAccessor.html#getLong(java.time.temporal.TemporalField))([TemporalField](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalField.html) field) Gets the value of the specified field as a `long`. |
| abstract boolean | [isSupported](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAccessor.html#isSupported(java.time.temporal.TemporalField))([TemporalField](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalField.html) field) Checks if the specified field is supported. |
| \<R\> R | [query](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAccessor.html#query(java.time.temporal.TemporalQuery<R>))([TemporalQuery](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalQuery.html)\<R\> query) Queries this date-time. |
| [ValueRange](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/ValueRange.html) | [range](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAccessor.html#range(java.time.temporal.TemporalField))([TemporalField](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalField.html) field) Gets the range of valid values for the specified field. |

## Public Methods

#### public [Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html)
**adjustInto**
([Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html) temporal)

Adjusts the specified temporal object to have this year-month.


This returns a temporal object of the same observable type as the input
with the year and month changed to be the same as this.


The adjustment is equivalent to using `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html#with(java.time.temporal.TemporalField,%20long)`
passing `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/ChronoField.html#PROLEPTIC_MONTH` as the field.
If the specified temporal object does not use the ISO calendar system then
a `DateTimeException` is thrown.


In most cases, it is clearer to reverse the calling pattern by using
`https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html#with(java.time.temporal.TemporalAdjuster)`:

```
   // these two lines are equivalent, but the second approach is recommended
   temporal = thisYearMonth.adjustInto(temporal);
   temporal = temporal.with(thisYearMonth);
 
```


This instance is immutable and unaffected by this method call.

##### Parameters

| temporal | the target object to be adjusted, not null |
|---|---|

##### Returns

- the adjusted object, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if unable to make the adjustment |
| [ArithmeticException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ArithmeticException.html) | if numeric overflow occurs |
|---|---|

#### public [LocalDate](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/LocalDate.html)
**atDay**
(int dayOfMonth)

Combines this year-month with a day-of-month to create a `LocalDate`.


This returns a `LocalDate` formed from this year-month and the specified day-of-month.


The day-of-month value must be valid for the year-month.


This method can be used as part of a chain to produce a date:

```
  LocalDate date = year.atMonth(month).atDay(day);
 
```

<br />

##### Parameters

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

##### Returns

- the date formed from this year-month and the specified day, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the day is invalid for the year-month |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#isValidDay(int)`

#### public [LocalDate](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/LocalDate.html)
**atEndOfMonth**
()

Returns a `LocalDate` at the end of the month.


This returns a `LocalDate` based on this year-month.
The day-of-month is set to the last valid day of the month, taking
into account leap years.


This method can be used as part of a chain to produce a date:

```
  LocalDate date = year.atMonth(month).atEndOfMonth();
 
```

<br />

##### Returns

- the last valid date of this year-month, not null

#### public int
**compareTo**
([YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) other)

Compares this year-month to another year-month.


The comparison is based first on the value of the year, then on the value of the month.
It is "consistent with equals", as defined by `https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Comparable.html`.

##### Parameters

| other | the other year-month to compare to, not null |
|---|---|

##### Returns

- the comparator value, negative if less, positive if greater

#### public boolean
**equals**
([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) obj)

Checks if this year-month is equal to another year-month.


The comparison is based on the time-line position of the year-months.

##### Parameters

| obj | the object to check, null returns false |
|---|---|

##### Returns

- true if this is equal to the other year-month

#### public [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)
**format**
([DateTimeFormatter](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/format/DateTimeFormatter.html) formatter)

Formats this year-month using the specified formatter.


This year-month will be passed to the formatter to produce a string.

##### Parameters

| formatter | the formatter to use, not null |
|---|---|

##### Returns

- the formatted year-month string, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if an error occurs during printing |
|---|---|

#### public static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**from**
([TemporalAccessor](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAccessor.html) temporal)

Obtains an instance of `YearMonth` from a temporal object.


This obtains a year-month based on the specified temporal.
A `TemporalAccessor` represents an arbitrary set of date and time information,
which this factory converts to an instance of `YearMonth`.


The conversion extracts the `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/ChronoField.html#YEAR` and
`https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/ChronoField.html#MONTH_OF_YEAR` fields.
The extraction is only permitted if the temporal object has an ISO
chronology, or can be converted to a `LocalDate`.


This method matches the signature of the functional interface `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalQuery.html`
allowing it to be used as a query via method reference, `YearMonth::from`.

##### Parameters

| temporal | the temporal object to convert, not null |
|---|---|

##### Returns

- the year-month, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if unable to convert to a `YearMonth` |
|---|---|

#### public int
**get**
([TemporalField](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalField.html) field)

Gets the value of the specified field from this year-month as an `int`.


This queries this year-month for the value of the specified field.
The returned value will always be within the valid range of values for the field.
If it is not possible to return the value, because the field is not supported
or for some other reason, an exception is thrown.


If the field is a `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/ChronoField.html` then the query is implemented here.
The `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#isSupported(java.time.temporal.TemporalField)` will return valid
values based on this year-month, except `PROLEPTIC_MONTH` which is too
large to fit in an `int` and throw a `DateTimeException`.
All other `ChronoField` instances will throw an `UnsupportedTemporalTypeException`.


If the field is not a `ChronoField`, then the result of this method
is obtained by invoking `TemporalField.getFrom(TemporalAccessor)`
passing `this` as the argument. Whether the value can be obtained,
and what the value represents, is determined by the field.

##### Parameters

| field | the field to get, not null |
|---|---|

##### Returns

- the value for the field

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if a value for the field cannot be obtained or the value is outside the range of valid values for the field |
| [UnsupportedTemporalTypeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/UnsupportedTemporalTypeException.html) | if the field is not supported or the range of values exceeds an `int` |
| [ArithmeticException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ArithmeticException.html) | if numeric overflow occurs |
|---|---|

#### public long
**getLong**
([TemporalField](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalField.html) field)

Gets the value of the specified field from this year-month as a `long`.


This queries this year-month for the value of the specified field.
If it is not possible to return the value, because the field is not supported
or for some other reason, an exception is thrown.


If the field is a `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/ChronoField.html` then the query is implemented here.
The `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#isSupported(java.time.temporal.TemporalField)` will return valid
values based on this year-month.
All other `ChronoField` instances will throw an `UnsupportedTemporalTypeException`.


If the field is not a `ChronoField`, then the result of this method
is obtained by invoking `TemporalField.getFrom(TemporalAccessor)`
passing `this` as the argument. Whether the value can be obtained,
and what the value represents, is determined by the field.

##### Parameters

| field | the field to get, not null |
|---|---|

##### Returns

- the value for the field

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if a value for the field cannot be obtained |
| [UnsupportedTemporalTypeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/UnsupportedTemporalTypeException.html) | if the field is not supported |
| [ArithmeticException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ArithmeticException.html) | if numeric overflow occurs |
|---|---|

#### public [Month](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/Month.html)
**getMonth**
()

Gets the month-of-year field using the `Month` enum.


This method returns the enum `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/Month.html` for the month.
This avoids confusion as to what `int` values mean.
If you need access to the primitive `int` value then the enum
provides the `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/Month.html#getValue()`.

##### Returns

- the month-of-year, not null

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#getMonthValue()`

#### public int
**getMonthValue**
()

Gets the month-of-year field from 1 to 12.


This method returns the month as an `int` from 1 to 12.
Application code is frequently clearer if the enum `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/Month.html`
is used by calling `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#getMonth()`.

##### Returns

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

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#getMonth()`

#### public int
**getYear**
()

Gets the year field.


This method returns the primitive `int` value for the year.


The year returned by this method is proleptic as per `get(YEAR)`.

##### Returns

- the year, from MIN_YEAR to MAX_YEAR

#### public int
**hashCode**
()

A hash code for this year-month.

##### Returns

- a suitable hash code

#### public boolean
**isAfter**
([YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) other)

Checks if this year-month is after the specified year-month.

##### Parameters

| other | the other year-month to compare to, not null |
|---|---|

##### Returns

- true if this is after the specified year-month

#### public boolean
**isBefore**
([YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html) other)

Checks if this year-month is before the specified year-month.

##### Parameters

| other | the other year-month to compare to, not null |
|---|---|

##### Returns

- true if this point is before the specified year-month

#### public boolean
**isLeapYear**
()

Checks if the year is a leap year, according to the ISO proleptic
calendar system rules.


This method applies the current rules for leap years across the whole time-line.
In general, a year is a leap year if it is divisible by four without
remainder. However, years divisible by 100, are not leap years, with
the exception of years divisible by 400 which are.


For example, 1904 is a leap year it is divisible by 4.
1900 was not a leap year as it is divisible by 100, however 2000 was a
leap year as it is divisible by 400.


The calculation is proleptic - applying the same rules into the far future and far past.
This is historically inaccurate, but is correct for the ISO-8601 standard.

##### Returns

- true if the year is leap, false otherwise

#### public boolean
**isSupported**
([TemporalUnit](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalUnit.html) unit)

Checks if the specified unit is supported.


This checks if the specified unit can be added to, or subtracted from, this year-month.
If false, then calling the `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#plus(long,%20java.time.temporal.TemporalUnit)` and
`https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#minus(long,%20java.time.temporal.TemporalUnit)` methods will throw an exception.


If the unit is a `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/ChronoUnit.html` then the query is implemented here.
The supported units are:

- `MONTHS`
- `YEARS`
- `DECADES`
- `CENTURIES`
- `MILLENNIA`
- `ERAS`

All other `ChronoUnit` instances will return false.


If the unit is not a `ChronoUnit`, then the result of this method
is obtained by invoking `TemporalUnit.isSupportedBy(Temporal)`
passing `this` as the argument.
Whether the unit is supported is determined by the unit.

##### Parameters

| unit | the unit to check, null returns false |
|---|---|

##### Returns

- true if the unit can be added/subtracted, false if not

#### public boolean
**isSupported**
([TemporalField](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalField.html) field)

Checks if the specified field is supported.


This checks if this year-month can be queried for the specified field.
If false, then calling the `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#range(java.time.temporal.TemporalField)`,
`https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#get(java.time.temporal.TemporalField)` and `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#with(java.time.temporal.TemporalField,%20long)`
methods will throw an exception.


If the field is a `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/ChronoField.html` then the query is implemented here.
The supported fields are:

- `MONTH_OF_YEAR`
- `PROLEPTIC_MONTH`
- `YEAR_OF_ERA`
- `YEAR`
- `ERA`

All other `ChronoField` instances will return false.


If the field is not a `ChronoField`, then the result of this method
is obtained by invoking `TemporalField.isSupportedBy(TemporalAccessor)`
passing `this` as the argument.
Whether the field is supported is determined by the field.

##### Parameters

| field | the field to check, null returns false |
|---|---|

##### Returns

- true if the field is supported on this year-month, false if not

#### public boolean
**isValidDay**
(int dayOfMonth)

Checks if the day-of-month is valid for this year-month.


This method checks whether this year and month and the input day form
a valid date.

##### Parameters

| dayOfMonth | the day-of-month to validate, from 1 to 31, invalid value returns false |
|---|---|

##### Returns

- true if the day is valid for this year-month

#### public int
**lengthOfMonth**
()

Returns the length of the month, taking account of the year.


This returns the length of the month in days.
For example, a date in January would return 31.

##### Returns

- the length of the month in days, from 28 to 31

#### public int
**lengthOfYear**
()

Returns the length of the year.


This returns the length of the year in days, either 365 or 366.

##### Returns

- 366 if the year is leap, 365 otherwise

#### public [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**minus**
([TemporalAmount](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAmount.html) amountToSubtract)

Returns a copy of this year-month with the specified amount subtracted.


This returns a `YearMonth`, based on this one, with the specified amount subtracted.
The amount is typically `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/Period.html` but may be any other type implementing
the `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAmount.html` interface.


The calculation is delegated to the amount object by calling
`https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAmount.html#subtractFrom(java.time.temporal.Temporal)`. The amount implementation is free
to implement the subtraction in any way it wishes, however it typically
calls back to `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#minus(long,%20java.time.temporal.TemporalUnit)`. Consult the documentation
of the amount implementation to determine if it can be successfully subtracted.


This instance is immutable and unaffected by this method call.

##### Parameters

| amountToSubtract | the amount to subtract, not null |
|---|---|

##### Returns

- a `YearMonth` based on this year-month with the subtraction made, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the subtraction cannot be made |
| [ArithmeticException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ArithmeticException.html) | if numeric overflow occurs |
|---|---|

#### public [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**minus**
(long amountToSubtract, [TemporalUnit](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalUnit.html) unit)

Returns a copy of this year-month with the specified amount subtracted.


This returns a `YearMonth`, based on this one, with the amount
in terms of the unit subtracted. If it is not possible to subtract the amount,
because the unit is not supported or for some other reason, an exception is thrown.


This method is equivalent to `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#plus(long,%20java.time.temporal.TemporalUnit)` with the amount negated.
See that method for a full description of how addition, and thus subtraction, works.


This instance is immutable and unaffected by this method call.

##### Parameters

| amountToSubtract | the amount of the unit to subtract from the result, may be negative |
| unit | the unit of the amount to subtract, not null |
|---|---|

##### Returns

- a `YearMonth` based on this year-month with the specified amount subtracted, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the subtraction cannot be made |
| [UnsupportedTemporalTypeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/UnsupportedTemporalTypeException.html) | if the unit is not supported |
| [ArithmeticException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ArithmeticException.html) | if numeric overflow occurs |
|---|---|

#### public [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**minusMonths**
(long monthsToSubtract)

Returns a copy of this `YearMonth` with the specified number of months subtracted.


This instance is immutable and unaffected by this method call.

##### Parameters

| monthsToSubtract | the months to subtract, may be negative |
|---|---|

##### Returns

- a `YearMonth` based on this year-month with the months subtracted, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the result exceeds the supported range |
|---|---|

#### public [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**minusYears**
(long yearsToSubtract)

Returns a copy of this `YearMonth` with the specified number of years subtracted.


This instance is immutable and unaffected by this method call.

##### Parameters

| yearsToSubtract | the years to subtract, may be negative |
|---|---|

##### Returns

- a `YearMonth` based on this year-month with the years subtracted, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the result exceeds the supported range |
|---|---|

#### public static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**now**
([ZoneId](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/ZoneId.html) zone)

Obtains the current year-month from the system clock in the specified time-zone.


This will query the `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/Clock.html#system(java.time.ZoneId)` to obtain the current year-month.
Specifying the time-zone avoids dependence on the default time-zone.


Using this method will prevent the ability to use an alternate clock for testing
because the clock is hard-coded.

##### Parameters

| zone | the zone ID to use, not null |
|---|---|

##### Returns

- the current year-month using the system clock, not null

#### public static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**now**
()

Obtains the current year-month from the system clock in the default time-zone.


This will query the `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/Clock.html#systemDefaultZone()` in the default
time-zone to obtain the current year-month.


Using this method will prevent the ability to use an alternate clock for testing
because the clock is hard-coded.

##### Returns

- the current year-month using the system clock and default time-zone, not null

#### public static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**now**
([Clock](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/Clock.html) clock)

Obtains the current year-month from the specified clock.


This will query the specified clock to obtain the current year-month.
Using this method allows the use of an alternate clock for testing.
The alternate clock may be introduced using `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/Clock.html`.

##### Parameters

| clock | the clock to use, not null |
|---|---|

##### Returns

- the current year-month, not null

#### public static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**of**
(int year, [Month](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/Month.html) month)

Obtains an instance of `YearMonth` from a year and month.

##### Parameters

| year | the year to represent, from MIN_YEAR to MAX_YEAR |
| month | the month-of-year to represent, not null |
|---|---|

##### Returns

- the year-month, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the year value is invalid |
|---|---|

#### public static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**of**
(int year, int month)

Obtains an instance of `YearMonth` from a year and month.

##### Parameters

| year | the year to represent, from MIN_YEAR to MAX_YEAR |
| month | the month-of-year to represent, from 1 (January) to 12 (December) |
|---|---|

##### Returns

- the year-month, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if either field value is invalid |
|---|---|

#### public static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**parse**
([CharSequence](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/CharSequence.html) text, [DateTimeFormatter](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/format/DateTimeFormatter.html) formatter)

Obtains an instance of `YearMonth` from a text string using a specific formatter.


The text is parsed using the formatter, returning a year-month.

##### Parameters

| text | the text to parse, not null |
| formatter | the formatter to use, not null |
|---|---|

##### Returns

- the parsed year-month, not null

##### Throws

| [DateTimeParseException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/format/DateTimeParseException.html) | if the text cannot be parsed |
|---|---|

#### public static [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**parse**
([CharSequence](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/CharSequence.html) text)

Obtains an instance of `YearMonth` from a text string such as `2007-12`.


The string must represent a valid year-month.
The format must be `uuuu-MM`.
Years outside the range 0000 to 9999 must be prefixed by the plus or minus symbol.

##### Parameters

| text | the text to parse such as "2007-12", not null |
|---|---|

##### Returns

- the parsed year-month, not null

##### Throws

| [DateTimeParseException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/format/DateTimeParseException.html) | if the text cannot be parsed |
|---|---|

#### public [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**plus**
([TemporalAmount](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAmount.html) amountToAdd)

Returns a copy of this year-month with the specified amount added.


This returns a `YearMonth`, based on this one, with the specified amount added.
The amount is typically `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/Period.html` but may be any other type implementing
the `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAmount.html` interface.


The calculation is delegated to the amount object by calling
`https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAmount.html#addTo(java.time.temporal.Temporal)`. The amount implementation is free
to implement the addition in any way it wishes, however it typically
calls back to `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#plus(long,%20java.time.temporal.TemporalUnit)`. Consult the documentation
of the amount implementation to determine if it can be successfully added.


This instance is immutable and unaffected by this method call.

##### Parameters

| amountToAdd | the amount to add, not null |
|---|---|

##### Returns

- a `YearMonth` based on this year-month with the addition made, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the addition cannot be made |
| [ArithmeticException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ArithmeticException.html) | if numeric overflow occurs |
|---|---|

#### public [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**plus**
(long amountToAdd, [TemporalUnit](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalUnit.html) unit)

Returns a copy of this year-month with the specified amount added.


This returns a `YearMonth`, based on this one, with the amount
in terms of the unit added. If it is not possible to add the amount, because the
unit is not supported or for some other reason, an exception is thrown.


If the field is a `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/ChronoUnit.html` then the addition is implemented here.
The supported fields behave as follows:

- `MONTHS` - Returns a `YearMonth` with the specified number of months added. This is equivalent to `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#plusMonths(long)`.
- `YEARS` - Returns a `YearMonth` with the specified number of years added. This is equivalent to `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#plusYears(long)`.
- `DECADES` - Returns a `YearMonth` with the specified number of decades added. This is equivalent to calling `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#plusYears(long)` with the amount multiplied by 10.
- `CENTURIES` - Returns a `YearMonth` with the specified number of centuries added. This is equivalent to calling `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#plusYears(long)` with the amount multiplied by 100.
- `MILLENNIA` - Returns a `YearMonth` with the specified number of millennia added. This is equivalent to calling `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#plusYears(long)` with the amount multiplied by 1,000.
- `ERAS` - Returns a `YearMonth` with the specified number of eras added. Only two eras are supported so the amount must be one, zero or minus one. If the amount is non-zero then the year is changed such that the year-of-era is unchanged.


All other `ChronoUnit` instances will throw an `UnsupportedTemporalTypeException`.


If the field is not a `ChronoUnit`, then the result of this method
is obtained by invoking `TemporalUnit.addTo(Temporal, long)`
passing `this` as the argument. In this case, the unit determines
whether and how to perform the addition.


This instance is immutable and unaffected by this method call.

##### Parameters

| amountToAdd | the amount of the unit to add to the result, may be negative |
| unit | the unit of the amount to add, not null |
|---|---|

##### Returns

- a `YearMonth` based on this year-month with the specified amount added, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the addition cannot be made |
| [UnsupportedTemporalTypeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/UnsupportedTemporalTypeException.html) | if the unit is not supported |
| [ArithmeticException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ArithmeticException.html) | if numeric overflow occurs |
|---|---|

#### public [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**plusMonths**
(long monthsToAdd)

Returns a copy of this `YearMonth` with the specified number of months added.


This instance is immutable and unaffected by this method call.

##### Parameters

| monthsToAdd | the months to add, may be negative |
|---|---|

##### Returns

- a `YearMonth` based on this year-month with the months added, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the result exceeds the supported range |
|---|---|

#### public [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**plusYears**
(long yearsToAdd)

Returns a copy of this `YearMonth` with the specified number of years added.


This instance is immutable and unaffected by this method call.

##### Parameters

| yearsToAdd | the years to add, may be negative |
|---|---|

##### Returns

- a `YearMonth` based on this year-month with the years added, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the result exceeds the supported range |
|---|---|

#### public R
**query**
([TemporalQuery](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalQuery.html)\<R\> query)

Queries this year-month using the specified query.


This queries this year-month using the specified query strategy object.
The `TemporalQuery` object defines the logic to be used to
obtain the result. Read the documentation of the query to understand
what the result of this method will be.


The result of this method is obtained by invoking the
`https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalQuery.html#queryFrom(java.time.temporal.TemporalAccessor)` method on the
specified query passing `this` as the argument.

##### Parameters

| query | the query to invoke, not null |
|---|---|

##### Returns

- the query result, null may be returned (defined by the query)

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if unable to query (defined by the query) |
| [ArithmeticException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ArithmeticException.html) | if numeric overflow occurs (defined by the query) |
|---|---|

#### public [ValueRange](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/ValueRange.html)
**range**
([TemporalField](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalField.html) field)

Gets the range of valid values for the specified field.


The range object expresses the minimum and maximum valid values for a field.
This year-month is used to enhance the accuracy of the returned range.
If it is not possible to return the range, because the field is not supported
or for some other reason, an exception is thrown.


If the field is a `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/ChronoField.html` then the query is implemented here.
The `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#isSupported(java.time.temporal.TemporalField)` will return
appropriate range instances.
All other `ChronoField` instances will throw an `UnsupportedTemporalTypeException`.


If the field is not a `ChronoField`, then the result of this method
is obtained by invoking `TemporalField.rangeRefinedBy(TemporalAccessor)`
passing `this` as the argument.
Whether the range can be obtained is determined by the field.

##### Parameters

| field | the field to query the range for, not null |
|---|---|

##### Returns

- the range of valid values for the field, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the range for the field cannot be obtained |
| [UnsupportedTemporalTypeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/UnsupportedTemporalTypeException.html) | if the field is not supported |
|---|---|

#### public [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)
**toString**
()

Outputs this year-month as a `String`, such as `2007-12`.


The output will be in the format `uuuu-MM`:

##### Returns

- a string representation of this year-month, not null

#### public long
**until**
([Temporal](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/Temporal.html) endExclusive, [TemporalUnit](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalUnit.html) unit)

Calculates the amount of time until another year-month in terms of the specified unit.


This calculates the amount of time between two `YearMonth`
objects in terms of a single `TemporalUnit`.
The start and end points are `this` and the specified year-month.
The result will be negative if the end is before the start.
The `Temporal` passed to this method is converted to a
`YearMonth` using `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html#from(java.time.temporal.TemporalAccessor)`.
For example, the amount in years between two year-months can be calculated
using `startYearMonth.until(endYearMonth, YEARS)`.


The calculation returns a whole number, representing the number of
complete units between the two year-months.
For example, the amount in decades between 2012-06 and 2032-05
will only be one decade as it is one month short of two decades.


There are two equivalent ways of using this method.
The first is to invoke this method.
The second is to use `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalUnit.html#between(java.time.temporal.Temporal,%20java.time.temporal.Temporal)`:

```
   // these two lines are equivalent
   amount = start.until(end, MONTHS);
   amount = MONTHS.between(start, end);
 
```
The choice should be made based on which makes the code more readable.


The calculation is implemented in this method for `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/ChronoUnit.html`.
The units `MONTHS`, `YEARS`, `DECADES`,
`CENTURIES`, `MILLENNIA` and `ERAS` are supported.
Other `ChronoUnit` values will throw an exception.


If the unit is not a `ChronoUnit`, then the result of this method
is obtained by invoking `TemporalUnit.between(Temporal, Temporal)`
passing `this` as the first argument and the converted input temporal
as the second argument.


This instance is immutable and unaffected by this method call.

##### Parameters

| endExclusive | the end date, exclusive, which is converted to a `YearMonth`, not null |
| unit | the unit to measure the amount in, not null |
|---|---|

##### Returns

- the amount of time between this year-month and the end year-month

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the amount cannot be calculated, or the end temporal cannot be converted to a `YearMonth` |
| [UnsupportedTemporalTypeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/UnsupportedTemporalTypeException.html) | if the unit is not supported |
| [ArithmeticException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ArithmeticException.html) | if numeric overflow occurs |
|---|---|

#### public [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**with**
([TemporalField](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalField.html) field, long newValue)

Returns a copy of this year-month with the specified field set to a new value.


This returns a `YearMonth`, based on this one, with the value
for the specified field changed.
This can be used to change any supported field, such as the year or month.
If it is not possible to set the value, because the field is not supported or for
some other reason, an exception is thrown.


If the field is a `https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/ChronoField.html` then the adjustment is implemented here.
The supported fields behave as follows:

- `MONTH_OF_YEAR` - Returns a `YearMonth` with the specified month-of-year. The year will be unchanged.
- `PROLEPTIC_MONTH` - Returns a `YearMonth` with the specified proleptic-month. This completely replaces the year and month of this object.
- `YEAR_OF_ERA` - Returns a `YearMonth` with the specified year-of-era The month and era will be unchanged.
- `YEAR` - Returns a `YearMonth` with the specified year. The month will be unchanged.
- `ERA` - Returns a `YearMonth` with the specified era. The month and year-of-era will be unchanged.


In all cases, if the new value is outside the valid range of values for the field
then a `DateTimeException` will be thrown.


All other `ChronoField` instances will throw an `UnsupportedTemporalTypeException`.


If the field is not a `ChronoField`, then the result of this method
is obtained by invoking `TemporalField.adjustInto(Temporal, long)`
passing `this` as the argument. In this case, the field determines
whether and how to adjust the instant.


This instance is immutable and unaffected by this method call.

##### Parameters

| field | the field to set in the result, not null |
| newValue | the new value of the field in the result |
|---|---|

##### Returns

- a `YearMonth` based on `this` with the specified field set, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the field cannot be set |
| [UnsupportedTemporalTypeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/UnsupportedTemporalTypeException.html) | if the field is not supported |
| [ArithmeticException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ArithmeticException.html) | if numeric overflow occurs |
|---|---|

#### public [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**with**
([TemporalAdjuster](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAdjuster.html) adjuster)

Returns an adjusted copy of this year-month.


This returns a `YearMonth`, based on this one, with the year-month adjusted.
The adjustment takes place using the specified adjuster strategy object.
Read the documentation of the adjuster to understand what adjustment will be made.


A simple adjuster might simply set the one of the fields, such as the year field.
A more complex adjuster might set the year-month to the next month that
Halley's comet will pass the Earth.


The result of this method is obtained by invoking the
`https://developers.google.com/j2objc/javadoc/jre/reference/java/time/temporal/TemporalAdjuster.html#adjustInto(java.time.temporal.Temporal)` method on the
specified adjuster passing `this` as the argument.


This instance is immutable and unaffected by this method call.

##### Parameters

| adjuster | the adjuster to use, not null |
|---|---|

##### Returns

- a `YearMonth` based on `this` with the adjustment made, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the adjustment cannot be made |
| [ArithmeticException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ArithmeticException.html) | if numeric overflow occurs |
|---|---|

#### public [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**withMonth**
(int month)

Returns a copy of this `YearMonth` with the month-of-year altered.


This instance is immutable and unaffected by this method call.

##### Parameters

| month | the month-of-year to set in the returned year-month, from 1 (January) to 12 (December) |
|---|---|

##### Returns

- a `YearMonth` based on this year-month with the requested month, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the month-of-year value is invalid |
|---|---|

#### public [YearMonth](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/YearMonth.html)
**withYear**
(int year)

Returns a copy of this `YearMonth` with the year altered.


This instance is immutable and unaffected by this method call.

##### Parameters

| year | the year to set in the returned year-month, from MIN_YEAR to MAX_YEAR |
|---|---|

##### Returns

- a `YearMonth` based on this year-month with the requested year, not null

##### Throws

| [DateTimeException](https://developers.google.com/j2objc/javadoc/jre/reference/java/time/DateTimeException.html) | if the year value is invalid |
|---|---|