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org.joda.time
Class Days

java.lang.Object
  extended by org.joda.time.base.BaseSingleFieldPeriod
      extended by org.joda.time.Days
All Implemented Interfaces:
Serializable, 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
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

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 corectly 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:
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:
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 corectly 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:
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.

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:
IllegalArgumentException - if the period contains imprecise duration values

parseDays

public static Days parseDays(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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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 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 Object
Returns:
the value as an ISO8601 string
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