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java.lang.Object org.joda.time.base.BaseSingleFieldPeriod org.joda.time.Days
public final class Days
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
typesafe 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 threadsafe and immutable.
Field Summary  

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  

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(Days days)
Returns a new instance with the specified number of days taken away. 
Days 
minus(int 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(String periodStr)
Creates a new Days by parsing a string in the ISO8601 format 'PnD'. 
Days 
plus(Days days)
Returns a new instance with the specified number of days added. 
Days 
plus(int 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. 
String 
toString()
Gets this instance as a String in the ISO8601 duration format. 
Methods inherited from class org.joda.time.base.BaseSingleFieldPeriod 

between, between, compareTo, equals, get, getFieldType, getValue, getValue, hashCode, isSupported, setValue, size, standardPeriodIn, toMutablePeriod, toPeriod 
Methods inherited from class java.lang.Object 

clone, finalize, getClass, notify, notifyAll, wait, wait, wait 
Field Detail 

public static final Days ZERO
public static final Days ONE
public static final Days TWO
public static final Days THREE
public static final Days FOUR
public static final Days FIVE
public static final Days SIX
public static final Days SEVEN
public static final Days MAX_VALUE
public static final Days MIN_VALUE
Method Detail 

public static Days days(int days)
Days
that may be cached.
Days
is immutable, so instances can be cached and shared.
This factory method provides access to shared instances.
days
 the number of days to obtain an instance for
public static Days daysBetween(ReadableInstant start, ReadableInstant end)
Days
representing the number of whole days
between the two specified datetimes. This method corectly handles
any daylight savings time changes that may occur during the interval.
start
 the start instant, must not be nullend
 the end instant, must not be null
IllegalArgumentException
 if the instants are null or invalidpublic static Days daysBetween(ReadablePartial start, ReadablePartial end)
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.
start
 the start partial date, must not be nullend
 the end partial date, must not be null
IllegalArgumentException
 if the partials are null or invalidpublic static Days daysIn(ReadableInterval interval)
Days
representing the number of whole days
in the specified interval. This method corectly handles any daylight
savings time changes that may occur during the interval.
interval
 the interval to extract days from, null returns zero
IllegalArgumentException
 if the partials are null or invalidpublic static Days standardDaysIn(ReadablePeriod period)
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.
period
 the period to get the number of hours from, null returns zero
IllegalArgumentException
 if the period contains imprecise duration valuespublic static Days parseDays(String periodStr)
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 nonzero. If any other component is nonzero, an exception will be thrown.
periodStr
 the period string, null returns zero
IllegalArgumentException
 if the string format is invalidpublic DurationFieldType getFieldType()
days
.
getFieldType
in class BaseSingleFieldPeriod
public PeriodType getPeriodType()
days
.
getPeriodType
in interface ReadablePeriod
getPeriodType
in class BaseSingleFieldPeriod
public Weeks toStandardWeeks()
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.
public Hours toStandardHours()
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.
ArithmeticException
 if the number of hours is too large to be representedpublic Minutes toStandardMinutes()
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.
ArithmeticException
 if the number of minutes is too large to be representedpublic Seconds toStandardSeconds()
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.
ArithmeticException
 if the number of seconds is too large to be representedpublic Duration toStandardDuration()
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.
public int getDays()
public Days plus(int days)
This instance is immutable and unaffected by this method call.
days
 the amount of days to add, may be negative
ArithmeticException
 if the result overflows an intpublic Days plus(Days days)
This instance is immutable and unaffected by this method call.
days
 the amount of days to add, may be negative, null means zero
ArithmeticException
 if the result overflows an intpublic Days minus(int days)
This instance is immutable and unaffected by this method call.
days
 the amount of days to take away, may be negative
ArithmeticException
 if the result overflows an intpublic Days minus(Days days)
This instance is immutable and unaffected by this method call.
days
 the amount of days to take away, may be negative, null means zero
ArithmeticException
 if the result overflows an intpublic Days multipliedBy(int scalar)
This instance is immutable and unaffected by this method call.
scalar
 the amount to multiply by, may be negative
ArithmeticException
 if the result overflows an intpublic Days dividedBy(int divisor)
This instance is immutable and unaffected by this method call.
divisor
 the amount to divide by, may be negative
ArithmeticException
 if the divisor is zeropublic Days negated()
ArithmeticException
 if the result overflows an intpublic boolean isGreaterThan(Days other)
other
 the other period, null means zero
public boolean isLessThan(Days other)
other
 the other period, null means zero
public String toString()
For example, "P4D" represents 4 days.
toString
in interface ReadablePeriod
toString
in class Object


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