java.lang.Object
- org.joda.time.base.BaseSingleFieldPeriod
- - org.joda.time.Days

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<BaseSingleFieldPeriod>, ReadablePeriod
```
public final class Days
extends BaseSingleFieldPeriod
```
An immutable time period representing a number of days.
Days is an immutable period that can only store days. It does not store years, months or hours for example. As such it is a type-safe way of representing a number of days in an application.
The number of days is set in the constructor, and may be queried using getDays(). Basic mathematical operations are provided - plus(), minus(), multipliedBy() and dividedBy().
Days is thread-safe and immutable.

Since:

1.4

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field	Description
`static Days`	`FIVE`	Constant representing five days.
`static Days`	`FOUR`	Constant representing four days.
`static Days`	`MAX_VALUE`	Constant representing the maximum number of days that can be stored in this object.
`static Days`	`MIN_VALUE`	Constant representing the minimum number of days that can be stored in this object.
`static Days`	`ONE`	Constant representing one day.
`static Days`	`SEVEN`	Constant representing seven days.
`static Days`	`SIX`	Constant representing six days.
`static Days`	`THREE`	Constant representing three days.
`static Days`	`TWO`	Constant representing two days.
`static Days`	`ZERO`	Constant representing zero days.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static Days`	`days(int days)`	Obtains an instance of `Days` that may be cached.
`static Days`	`daysBetween(ReadableInstant start, ReadableInstant end)`	Creates a `Days` representing the number of whole days between the two specified datetimes.
`static Days`	`daysBetween(ReadablePartial start, ReadablePartial end)`	Creates a `Days` representing the number of whole days between the two specified partial datetimes.
`static Days`	`daysIn(ReadableInterval interval)`	Creates a `Days` representing the number of whole days in the specified interval.
`Days`	`dividedBy(int divisor)`	Returns a new instance with the days divided by the specified divisor.
`int`	`getDays()`	Gets the number of days that this period represents.
`DurationFieldType`	`getFieldType()`	Gets the duration field type, which is `days`.
`PeriodType`	`getPeriodType()`	Gets the period type, which is `days`.
`boolean`	`isGreaterThan(Days other)`	Is this days instance greater than the specified number of days.
`boolean`	`isLessThan(Days other)`	Is this days instance less than the specified number of days.
`Days`	`minus(int days)`	Returns a new instance with the specified number of days taken away.
`Days`	`minus(Days days)`	Returns a new instance with the specified number of days taken away.
`Days`	`multipliedBy(int scalar)`	Returns a new instance with the days multiplied by the specified scalar.
`Days`	`negated()`	Returns a new instance with the days value negated.
`static Days`	`parseDays(java.lang.String periodStr)`	Creates a new `Days` by parsing a string in the ISO8601 format 'PnD'.
`Days`	`plus(int days)`	Returns a new instance with the specified number of days added.
`Days`	`plus(Days days)`	Returns a new instance with the specified number of days added.
`static Days`	`standardDaysIn(ReadablePeriod period)`	Creates a new `Days` representing the number of complete standard length days in the specified period.
`Duration`	`toStandardDuration()`	Converts this period in days to a duration in milliseconds assuming a 24 hour day, 60 minute hour and 60 second minute.
`Hours`	`toStandardHours()`	Converts this period in days to a period in hours assuming a 24 hour day.
`Minutes`	`toStandardMinutes()`	Converts this period in days to a period in minutes assuming a 24 hour day and 60 minute hour.
`Seconds`	`toStandardSeconds()`	Converts this period in days to a period in seconds assuming a 24 hour day, 60 minute hour and 60 second minute.
`Weeks`	`toStandardWeeks()`	Converts this period in days to a period in weeks assuming a 7 day week.
`java.lang.String`	`toString()`	Gets this instance as a String in the ISO8601 duration format.

Methods inherited from class org.joda.time.base.BaseSingleFieldPeriod
compareTo, equals, get, getFieldType, getValue, hashCode, isSupported, size, toMutablePeriod, toPeriod

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - ZERO
```
public static final Days ZERO
```
    Constant representing zero days.
  - ONE
```
public static final Days ONE
```
    Constant representing one day.
  - TWO
```
public static final Days TWO
```
    Constant representing two days.
  - THREE
```
public static final Days THREE
```
    Constant representing three days.
  - FOUR
```
public static final Days FOUR
```
    Constant representing four days.
  - FIVE
```
public static final Days FIVE
```
    Constant representing five days.
  - SIX
```
public static final Days SIX
```
    Constant representing six days.
  - SEVEN
```
public static final Days SEVEN
```
    Constant representing seven days.
  - MAX_VALUE
```
public static final Days MAX_VALUE
```
    Constant representing the maximum number of days that can be stored in this object.
  - MIN_VALUE
```
public static final Days MIN_VALUE
```
    Constant representing the minimum number of days that can be stored in this object.
- Method Detail
  - days
```
public static Days days(int days)
```
    Obtains an instance of Days that may be cached. Days is immutable, so instances can be cached and shared. This factory method provides access to shared instances.
    
    Parameters:
    
    days - the number of days to obtain an instance for
    
    Returns:
    
    the instance of Days
  - daysBetween
```
public static Days daysBetween(ReadableInstant start,
                               ReadableInstant end)
```
    Creates a Days representing the number of whole days between the two specified datetimes. This method correctly handles any daylight savings time changes that may occur during the interval.
    
    Parameters:
    
    start - the start instant, must not be null
    
    end - the end instant, must not be null
    
    Returns:
    
    the period in days
    
    Throws:
    
    java.lang.IllegalArgumentException - if the instants are null or invalid
  - daysBetween
```
public static Days daysBetween(ReadablePartial start,
                               ReadablePartial end)
```
    Creates a Days representing the number of whole days between the two specified partial datetimes.
    The two partials must contain the same fields, for example you can specify two LocalDate objects.
    
    Parameters:
    
    start - the start partial date, must not be null
    
    end - the end partial date, must not be null
    
    Returns:
    
    the period in days
    
    Throws:
    
    java.lang.IllegalArgumentException - if the partials are null or invalid
  - daysIn
```
public static Days daysIn(ReadableInterval interval)
```
    Creates a Days representing the number of whole days in the specified interval. This method correctly handles any daylight savings time changes that may occur during the interval.
    
    Parameters:
    
    interval - the interval to extract days from, null returns zero
    
    Returns:
    
    the period in days
    
    Throws:
    
    java.lang.IllegalArgumentException - if the partials are null or invalid
  - standardDaysIn
```
public static Days standardDaysIn(ReadablePeriod period)
```
    Creates a new Days representing the number of complete standard length days in the specified period.
    This factory method converts all fields from the period to hours using standardised durations for each field. Only those fields which have a precise duration in the ISO UTC chronology can be converted.
    
    One week consists of 7 days.
    One day consists of 24 hours.
    One hour consists of 60 minutes.
    One minute consists of 60 seconds.
    One second consists of 1000 milliseconds.
    Months and Years are imprecise and periods containing these values cannot be converted.
    Parameters:
    
    period - the period to get the number of hours from, null returns zero
    
    Returns:
    
    the period in days
    
    Throws:
    
    java.lang.IllegalArgumentException - if the period contains imprecise duration values
  - parseDays
```
public static Days parseDays(java.lang.String periodStr)
```
    Creates a new Days by parsing a string in the ISO8601 format 'PnD'.
    The parse will accept the full ISO syntax of PnYnMnWnDTnHnMnS however only the days component may be non-zero. If any other component is non-zero, an exception will be thrown.
    
    Parameters:
    
    periodStr - the period string, null returns zero
    
    Returns:
    
    the period in days
    
    Throws:
    
    java.lang.IllegalArgumentException - if the string format is invalid
  - getFieldType
```
public DurationFieldType getFieldType()
```
    Gets the duration field type, which is days.
    
    Specified by:
    
    getFieldType in class BaseSingleFieldPeriod
    
    Returns:
    
    the period type
  - getPeriodType
```
public PeriodType getPeriodType()
```
    Gets the period type, which is days.
    
    Specified by:
    
    getPeriodType in interface ReadablePeriod
    
    Specified by:
    
    getPeriodType in class BaseSingleFieldPeriod
    
    Returns:
    
    the period type
  - toStandardWeeks
```
public Weeks toStandardWeeks()
```
    Converts this period in days to a period in weeks assuming a 7 day week.
    This method allows you to convert between different types of period. However to achieve this it makes the assumption that all weeks are 7 days long. This may not be true for some unusual chronologies. However, it is included as it is a useful operation for many applications and business rules.
    
    Returns:
    
    a period representing the number of weeks for this number of days
  - toStandardHours
```
public Hours toStandardHours()
```
    Converts this period in days to a period in hours assuming a 24 hour day.
    This method allows you to convert between different types of period. However to achieve this it makes the assumption that all days are 24 hours long. This is not true when daylight savings is considered and may also not be true for some unusual chronologies. However, it is included as it is a useful operation for many applications and business rules.
    
    Returns:
    
    a period representing the number of hours for this number of days
    
    Throws:
    
    java.lang.ArithmeticException - if the number of hours is too large to be represented
  - toStandardMinutes
```
public Minutes toStandardMinutes()
```
    Converts this period in days to a period in minutes assuming a 24 hour day and 60 minute hour.
    This method allows you to convert between different types of period. However to achieve this it makes the assumption that all days are 24 hours long and all hours are 60 minutes long. This is not true when daylight savings is considered and may also not be true for some unusual chronologies. However, it is included as it is a useful operation for many applications and business rules.
    
    Returns:
    
    a period representing the number of minutes for this number of days
    
    Throws:
    
    java.lang.ArithmeticException - if the number of minutes is too large to be represented
  - toStandardSeconds
```
public Seconds toStandardSeconds()
```
    Converts this period in days to a period in seconds assuming a 24 hour day, 60 minute hour and 60 second minute.
    This method allows you to convert between different types of period. However to achieve this it makes the assumption that all days are 24 hours long, all hours are 60 minutes long and all minutes are 60 seconds long. This is not true when daylight savings is considered and may also not be true for some unusual chronologies. However, it is included as it is a useful operation for many applications and business rules.
    
    Returns:
    
    a period representing the number of seconds for this number of days
    
    Throws:
    
    java.lang.ArithmeticException - if the number of seconds is too large to be represented
  - toStandardDuration
```
public Duration toStandardDuration()
```
    Converts this period in days to a duration in milliseconds assuming a 24 hour day, 60 minute hour and 60 second minute.
    This method allows you to convert from a period to a duration. However to achieve this it makes the assumption that all days are 24 hours long, all hours are 60 minutes and all minutes are 60 seconds. This is not true when daylight savings time is considered, and may also not be true for some unusual chronologies. However, it is included as it is a useful operation for many applications and business rules.
    
    Returns:
    
    a duration equivalent to this number of days
  - getDays
```
public int getDays()
```
    Gets the number of days that this period represents.
    
    Returns:
    
    the number of days in the period
  - plus
```
public Days plus(int days)
```
    Returns a new instance with the specified number of days added.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    days - the amount of days to add, may be negative
    
    Returns:
    
    the new period plus the specified number of days
    
    Throws:
    
    java.lang.ArithmeticException - if the result overflows an int
  - plus
```
public Days plus(Days days)
```
    Returns a new instance with the specified number of days added.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    days - the amount of days to add, may be negative, null means zero
    
    Returns:
    
    the new period plus the specified number of days
    
    Throws:
    
    java.lang.ArithmeticException - if the result overflows an int
  - minus
```
public Days minus(int days)
```
    Returns a new instance with the specified number of days taken away.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    days - the amount of days to take away, may be negative
    
    Returns:
    
    the new period minus the specified number of days
    
    Throws:
    
    java.lang.ArithmeticException - if the result overflows an int
  - minus
```
public Days minus(Days days)
```
    Returns a new instance with the specified number of days taken away.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    days - the amount of days to take away, may be negative, null means zero
    
    Returns:
    
    the new period minus the specified number of days
    
    Throws:
    
    java.lang.ArithmeticException - if the result overflows an int
  - multipliedBy
```
public Days multipliedBy(int scalar)
```
    Returns a new instance with the days multiplied by the specified scalar.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    scalar - the amount to multiply by, may be negative
    
    Returns:
    
    the new period multiplied by the specified scalar
    
    Throws:
    
    java.lang.ArithmeticException - if the result overflows an int
  - dividedBy
```
public Days dividedBy(int divisor)
```
    Returns a new instance with the days divided by the specified divisor. The calculation uses integer division, thus 3 divided by 2 is 1.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    divisor - the amount to divide by, may be negative
    
    Returns:
    
    the new period divided by the specified divisor
    
    Throws:
    
    java.lang.ArithmeticException - if the divisor is zero
  - negated
```
public Days negated()
```
    Returns a new instance with the days value negated.
    
    Returns:
    
    the new period with a negated value
    
    Throws:
    
    java.lang.ArithmeticException - if the result overflows an int
  - isGreaterThan
```
public boolean isGreaterThan(Days other)
```
    Is this days instance greater than the specified number of days.
    
    Parameters:
    
    other - the other period, null means zero
    
    Returns:
    
    true if this days instance is greater than the specified one
  - isLessThan
```
public boolean isLessThan(Days other)
```
    Is this days instance less than the specified number of days.
    
    Parameters:
    
    other - the other period, null means zero
    
    Returns:
    
    true if this days instance is less than the specified one
  - toString
```
public java.lang.String toString()
```
    Gets this instance as a String in the ISO8601 duration format.
    For example, "P4D" represents 4 days.
    
    Specified by:
    
    toString in interface ReadablePeriod
    
    Overrides:
    
    toString in class java.lang.Object
    
    Returns:
    
    the value as an ISO8601 string

Class Days

Field Summary

Method Summary

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

Methods inherited from class java.lang.Object

Field Detail

ZERO

ONE

TWO

THREE

FOUR

FIVE

SIX

SEVEN

MAX_VALUE

MIN_VALUE

Method Detail

days

daysBetween

daysBetween

daysIn

standardDaysIn

parseDays

getFieldType

getPeriodType

toStandardWeeks

toStandardHours

toStandardMinutes

toStandardSeconds

toStandardDuration

getDays

plus

plus

minus

minus

multipliedBy

dividedBy

negated

isGreaterThan

isLessThan

toString