 All Implemented Interfaces:
Serializable
,Comparable<Duration>
,TemporalAmount
public final class Duration extends Object implements TemporalAmount, Comparable<Duration>, Serializable
This class models a quantity or amount of time in terms of seconds and nanoseconds.
It can be accessed using other durationbased units, such as minutes and hours.
In addition, the DAYS
unit can be used and is treated as
exactly equal to 24 hours, thus ignoring daylight savings effects.
See Period
for the datebased equivalent to this class.
A physical duration could be of infinite length.
For practicality, the duration is stored with constraints similar to Instant
.
The duration uses nanosecond resolution with a maximum value of the seconds that can
be held in a long
. This is greater than the current estimated age of the universe.
The range of a duration requires the storage of a number larger than a long
.
To achieve this, the class stores a long
representing seconds and an int
representing nanosecondofsecond, which will always be between 0 and 999,999,999.
The model is of a directed duration, meaning that the duration may be negative.
The duration is measured in "seconds", but these are not necessarily identical to
the scientific "SI second" definition based on atomic clocks.
This difference only impacts durations measured near a leapsecond and should not affect
most applications.
See Instant
for a discussion as to the meaning of the second and timescales.
This is a valuebased
class; use of identitysensitive operations (including reference equality
(==
), identity hash code, or synchronization) on instances of
Duration
may have unpredictable results and should be avoided.
The equals
method should be used for comparisons.
 Implementation Requirements:
 This class is immutable and threadsafe.
 Since:
 1.8
 See Also:
 Serialized Form

Field Summary

Method Summary
Modifier and Type Method Description Duration
abs()
Returns a copy of this duration with a positive length.Temporal
addTo(Temporal temporal)
Adds this duration to the specified temporal object.static Duration
between(Temporal startInclusive, Temporal endExclusive)
Obtains aDuration
representing the duration between two temporal objects.int
compareTo(Duration otherDuration)
Compares this duration to the specifiedDuration
.Duration
dividedBy(long divisor)
Returns a copy of this duration divided by the specified value.long
dividedBy(Duration divisor)
Returns number of whole times a specified Duration occurs within this Duration.boolean
equals(Object otherDuration)
Checks if this duration is equal to the specifiedDuration
.static Duration
from(TemporalAmount amount)
Obtains an instance ofDuration
from a temporal amount.long
get(TemporalUnit unit)
Gets the value of the requested unit.int
getNano()
Gets the number of nanoseconds within the second in this duration.long
getSeconds()
Gets the number of seconds in this duration.List<TemporalUnit>
getUnits()
Gets the set of units supported by this duration.int
hashCode()
A hash code for this duration.boolean
isNegative()
Checks if this duration is negative, excluding zero.boolean
isZero()
Checks if this duration is zero length.Duration
minus(long amountToSubtract, TemporalUnit unit)
Returns a copy of this duration with the specified duration subtracted.Duration
minus(Duration duration)
Returns a copy of this duration with the specified duration subtracted.Duration
minusDays(long daysToSubtract)
Returns a copy of this duration with the specified duration in standard 24 hour days subtracted.Duration
minusHours(long hoursToSubtract)
Returns a copy of this duration with the specified duration in hours subtracted.Duration
minusMillis(long millisToSubtract)
Returns a copy of this duration with the specified duration in milliseconds subtracted.Duration
minusMinutes(long minutesToSubtract)
Returns a copy of this duration with the specified duration in minutes subtracted.Duration
minusNanos(long nanosToSubtract)
Returns a copy of this duration with the specified duration in nanoseconds subtracted.Duration
minusSeconds(long secondsToSubtract)
Returns a copy of this duration with the specified duration in seconds subtracted.Duration
multipliedBy(long multiplicand)
Returns a copy of this duration multiplied by the scalar.Duration
negated()
Returns a copy of this duration with the length negated.static Duration
of(long amount, TemporalUnit unit)
Obtains aDuration
representing an amount in the specified unit.static Duration
ofDays(long days)
Obtains aDuration
representing a number of standard 24 hour days.static Duration
ofHours(long hours)
Obtains aDuration
representing a number of standard hours.static Duration
ofMillis(long millis)
Obtains aDuration
representing a number of milliseconds.static Duration
ofMinutes(long minutes)
Obtains aDuration
representing a number of standard minutes.static Duration
ofNanos(long nanos)
Obtains aDuration
representing a number of nanoseconds.static Duration
ofSeconds(long seconds)
Obtains aDuration
representing a number of seconds.static Duration
ofSeconds(long seconds, long nanoAdjustment)
Obtains aDuration
representing a number of seconds and an adjustment in nanoseconds.static Duration
parse(CharSequence text)
Obtains aDuration
from a text string such asPnDTnHnMn.nS
.Duration
plus(long amountToAdd, TemporalUnit unit)
Returns a copy of this duration with the specified duration added.Duration
plus(Duration duration)
Returns a copy of this duration with the specified duration added.Duration
plusDays(long daysToAdd)
Returns a copy of this duration with the specified duration in standard 24 hour days added.Duration
plusHours(long hoursToAdd)
Returns a copy of this duration with the specified duration in hours added.Duration
plusMillis(long millisToAdd)
Returns a copy of this duration with the specified duration in milliseconds added.Duration
plusMinutes(long minutesToAdd)
Returns a copy of this duration with the specified duration in minutes added.Duration
plusNanos(long nanosToAdd)
Returns a copy of this duration with the specified duration in nanoseconds added.Duration
plusSeconds(long secondsToAdd)
Returns a copy of this duration with the specified duration in seconds added.Temporal
subtractFrom(Temporal temporal)
Subtracts this duration from the specified temporal object.long
toDays()
Gets the number of days in this duration.long
toDaysPart()
Extracts the number of days in the duration.long
toHours()
Gets the number of hours in this duration.int
toHoursPart()
Extracts the number of hours part in the duration.long
toMillis()
Converts this duration to the total length in milliseconds.int
toMillisPart()
Extracts the number of milliseconds part of the duration.long
toMinutes()
Gets the number of minutes in this duration.int
toMinutesPart()
Extracts the number of minutes part in the duration.long
toNanos()
Converts this duration to the total length in nanoseconds expressed as along
.int
toNanosPart()
Get the nanoseconds part within seconds of the duration.long
toSeconds()
Gets the number of seconds in this duration.int
toSecondsPart()
Extracts the number of seconds part in the duration.String
toString()
A string representation of this duration using ISO8601 seconds based representation, such asPT8H6M12.345S
.Duration
truncatedTo(TemporalUnit unit)
Returns a copy of thisDuration
truncated to the specified unit.Duration
withNanos(int nanoOfSecond)
Returns a copy of this duration with the specified nanoofsecond.Duration
withSeconds(long seconds)
Returns a copy of this duration with the specified amount of seconds.

Field Details

ZERO
Constant for a duration of zero.


Method Details

ofDays
Obtains aDuration
representing a number of standard 24 hour days.The seconds are calculated based on the standard definition of a day, where each day is 86400 seconds which implies a 24 hour day. The nanosecond in second field is set to zero.
 Parameters:
days
 the number of days, positive or negative Returns:
 a
Duration
, not null  Throws:
ArithmeticException
 if the input days exceeds the capacity ofDuration

ofHours
Obtains aDuration
representing a number of standard hours.The seconds are calculated based on the standard definition of an hour, where each hour is 3600 seconds. The nanosecond in second field is set to zero.
 Parameters:
hours
 the number of hours, positive or negative Returns:
 a
Duration
, not null  Throws:
ArithmeticException
 if the input hours exceeds the capacity ofDuration

ofMinutes
Obtains aDuration
representing a number of standard minutes.The seconds are calculated based on the standard definition of a minute, where each minute is 60 seconds. The nanosecond in second field is set to zero.
 Parameters:
minutes
 the number of minutes, positive or negative Returns:
 a
Duration
, not null  Throws:
ArithmeticException
 if the input minutes exceeds the capacity ofDuration

ofSeconds
Obtains aDuration
representing a number of seconds.The nanosecond in second field is set to zero.
 Parameters:
seconds
 the number of seconds, positive or negative Returns:
 a
Duration
, not null

ofSeconds
Obtains aDuration
representing a number of seconds and an adjustment in nanoseconds.This method allows an arbitrary number of nanoseconds to be passed in. The factory will alter the values of the second and nanosecond in order to ensure that the stored nanosecond is in the range 0 to 999,999,999. For example, the following will result in exactly the same duration:
Duration.ofSeconds(3, 1); Duration.ofSeconds(4, 999_999_999); Duration.ofSeconds(2, 1000_000_001);
 Parameters:
seconds
 the number of seconds, positive or negativenanoAdjustment
 the nanosecond adjustment to the number of seconds, positive or negative Returns:
 a
Duration
, not null  Throws:
ArithmeticException
 if the adjustment causes the seconds to exceed the capacity ofDuration

ofMillis
Obtains aDuration
representing a number of milliseconds.The seconds and nanoseconds are extracted from the specified milliseconds.
 Parameters:
millis
 the number of milliseconds, positive or negative Returns:
 a
Duration
, not null

ofNanos
Obtains aDuration
representing a number of nanoseconds.The seconds and nanoseconds are extracted from the specified nanoseconds.
 Parameters:
nanos
 the number of nanoseconds, positive or negative Returns:
 a
Duration
, not null

of
Obtains aDuration
representing an amount in the specified unit.The parameters represent the two parts of a phrase like '6 Hours'. For example:
Duration.of(3, SECONDS); Duration.of(465, HOURS);
Only a subset of units are accepted by this method. The unit must either have an exact duration or beChronoUnit.DAYS
which is treated as 24 hours. Other units throw an exception. Parameters:
amount
 the amount of the duration, measured in terms of the unit, positive or negativeunit
 the unit that the duration is measured in, must have an exact duration, not null Returns:
 a
Duration
, not null  Throws:
DateTimeException
 if the period unit has an estimated durationArithmeticException
 if a numeric overflow occurs

from
Obtains an instance ofDuration
from a temporal amount.This obtains a duration based on the specified amount. A
TemporalAmount
represents an amount of time, which may be datebased or timebased, which this factory extracts to a duration.The conversion loops around the set of units from the amount and uses the duration of the unit to calculate the total
Duration
. Only a subset of units are accepted by this method. The unit must either have an exact duration or beChronoUnit.DAYS
which is treated as 24 hours. If any other units are found then an exception is thrown. Parameters:
amount
 the temporal amount to convert, not null Returns:
 the equivalent duration, not null
 Throws:
DateTimeException
 if unable to convert to aDuration
ArithmeticException
 if numeric overflow occurs

parse
Obtains aDuration
from a text string such asPnDTnHnMn.nS
.This will parse a textual representation of a duration, including the string produced by
toString()
. The formats accepted are based on the ISO8601 duration formatPnDTnHnMn.nS
with days considered to be exactly 24 hours.The string starts with an optional sign, denoted by the ASCII negative or positive symbol. If negative, the whole period is negated. The ASCII letter "P" is next in upper or lower case. There are then four sections, each consisting of a number and a suffix. The sections have suffixes in ASCII of "D", "H", "M" and "S" for days, hours, minutes and seconds, accepted in upper or lower case. The suffixes must occur in order. The ASCII letter "T" must occur before the first occurrence, if any, of an hour, minute or second section. At least one of the four sections must be present, and if "T" is present there must be at least one section after the "T". The number part of each section must consist of one or more ASCII digits. The number may be prefixed by the ASCII negative or positive symbol. The number of days, hours and minutes must parse to a
long
. The number of seconds must parse to along
with optional fraction. The decimal point may be either a dot or a comma. The fractional part may have from zero to 9 digits.The leading plus/minus sign, and negative values for other units are not part of the ISO8601 standard.
Examples:
"PT20.345S"  parses as "20.345 seconds" "PT15M"  parses as "15 minutes" (where a minute is 60 seconds) "PT10H"  parses as "10 hours" (where an hour is 3600 seconds) "P2D"  parses as "2 days" (where a day is 24 hours or 86400 seconds) "P2DT3H4M"  parses as "2 days, 3 hours and 4 minutes" "PT6H3M"  parses as "6 hours and +3 minutes" "PT6H3M"  parses as "6 hours and 3 minutes" "PT6H+3M"  parses as "+6 hours and 3 minutes"
 Parameters:
text
 the text to parse, not null Returns:
 the parsed duration, not null
 Throws:
DateTimeParseException
 if the text cannot be parsed to a duration

between
Obtains aDuration
representing the duration between two temporal objects.This calculates the duration between two temporal objects. If the objects are of different types, then the duration is calculated based on the type of the first object. For example, if the first argument is a
LocalTime
then the second argument is converted to aLocalTime
.The specified temporal objects must support the
SECONDS
unit. For full accuracy, either theNANOS
unit or theNANO_OF_SECOND
field should be supported.The result of this method can be a negative period if the end is before the start. To guarantee to obtain a positive duration call
abs()
on the result. Parameters:
startInclusive
 the start instant, inclusive, not nullendExclusive
 the end instant, exclusive, not null Returns:
 a
Duration
, not null  Throws:
DateTimeException
 if the seconds between the temporals cannot be obtainedArithmeticException
 if the calculation exceeds the capacity ofDuration

get
Gets the value of the requested unit.This returns a value for each of the two supported units,
SECONDS
andNANOS
. All other units throw an exception. Specified by:
get
in interfaceTemporalAmount
 Parameters:
unit
 theTemporalUnit
for which to return the value Returns:
 the long value of the unit
 Throws:
DateTimeException
 if the unit is not supportedUnsupportedTemporalTypeException
 if the unit is not supported

getUnits
Gets the set of units supported by this duration.The supported units are
SECONDS
, andNANOS
. They are returned in the order seconds, nanos.This set can be used in conjunction with
get(TemporalUnit)
to access the entire state of the duration. Specified by:
getUnits
in interfaceTemporalAmount
 Returns:
 a list containing the seconds and nanos units, not null

isZero
public boolean isZero()Checks if this duration is zero length.A
Duration
represents a directed distance between two points on the timeline and can therefore be positive, zero or negative. This method checks whether the length is zero. Returns:
 true if this duration has a total length equal to zero

isNegative
public boolean isNegative()Checks if this duration is negative, excluding zero.A
Duration
represents a directed distance between two points on the timeline and can therefore be positive, zero or negative. This method checks whether the length is less than zero. Returns:
 true if this duration has a total length less than zero

getSeconds
public long getSeconds()Gets the number of seconds in this duration.The length of the duration is stored using two fields  seconds and nanoseconds. The nanoseconds part is a value from 0 to 999,999,999 that is an adjustment to the length in seconds. The total duration is defined by calling this method and
getNano()
.A
Duration
represents a directed distance between two points on the timeline. A negative duration is expressed by the negative sign of the seconds part. A duration of 1 nanosecond is stored as 1 seconds plus 999,999,999 nanoseconds. Returns:
 the whole seconds part of the length of the duration, positive or negative

getNano
public int getNano()Gets the number of nanoseconds within the second in this duration.The length of the duration is stored using two fields  seconds and nanoseconds. The nanoseconds part is a value from 0 to 999,999,999 that is an adjustment to the length in seconds. The total duration is defined by calling this method and
getSeconds()
.A
Duration
represents a directed distance between two points on the timeline. A negative duration is expressed by the negative sign of the seconds part. A duration of 1 nanosecond is stored as 1 seconds plus 999,999,999 nanoseconds. Returns:
 the nanoseconds within the second part of the length of the duration, from 0 to 999,999,999

withSeconds
Returns a copy of this duration with the specified amount of seconds.This returns a duration with the specified seconds, retaining the nanoofsecond part of this duration.
This instance is immutable and unaffected by this method call.
 Parameters:
seconds
 the seconds to represent, may be negative Returns:
 a
Duration
based on this period with the requested seconds, not null

withNanos
Returns a copy of this duration with the specified nanoofsecond.This returns a duration with the specified nanoofsecond, retaining the seconds part of this duration.
This instance is immutable and unaffected by this method call.
 Parameters:
nanoOfSecond
 the nanoofsecond to represent, from 0 to 999,999,999 Returns:
 a
Duration
based on this period with the requested nanoofsecond, not null  Throws:
DateTimeException
 if the nanoofsecond is invalid

plus
Returns a copy of this duration with the specified duration added.This instance is immutable and unaffected by this method call.
 Parameters:
duration
 the duration to add, positive or negative, not null Returns:
 a
Duration
based on this duration with the specified duration added, not null  Throws:
ArithmeticException
 if numeric overflow occurs

plus
Returns a copy of this duration with the specified duration added.The duration amount is measured in terms of the specified unit. Only a subset of units are accepted by this method. The unit must either have an exact duration or be
ChronoUnit.DAYS
which is treated as 24 hours. Other units throw an exception.This instance is immutable and unaffected by this method call.
 Parameters:
amountToAdd
 the amount to add, measured in terms of the unit, positive or negativeunit
 the unit that the amount is measured in, must have an exact duration, not null Returns:
 a
Duration
based on this duration with the specified duration added, not null  Throws:
UnsupportedTemporalTypeException
 if the unit is not supportedArithmeticException
 if numeric overflow occurs

plusDays
Returns a copy of this duration with the specified duration in standard 24 hour days added.The number of days is multiplied by 86400 to obtain the number of seconds to add. This is based on the standard definition of a day as 24 hours.
This instance is immutable and unaffected by this method call.
 Parameters:
daysToAdd
 the days to add, positive or negative Returns:
 a
Duration
based on this duration with the specified days added, not null  Throws:
ArithmeticException
 if numeric overflow occurs

plusHours
Returns a copy of this duration with the specified duration in hours added.This instance is immutable and unaffected by this method call.
 Parameters:
hoursToAdd
 the hours to add, positive or negative Returns:
 a
Duration
based on this duration with the specified hours added, not null  Throws:
ArithmeticException
 if numeric overflow occurs

plusMinutes
Returns a copy of this duration with the specified duration in minutes added.This instance is immutable and unaffected by this method call.
 Parameters:
minutesToAdd
 the minutes to add, positive or negative Returns:
 a
Duration
based on this duration with the specified minutes added, not null  Throws:
ArithmeticException
 if numeric overflow occurs

plusSeconds
Returns a copy of this duration with the specified duration in seconds added.This instance is immutable and unaffected by this method call.
 Parameters:
secondsToAdd
 the seconds to add, positive or negative Returns:
 a
Duration
based on this duration with the specified seconds added, not null  Throws:
ArithmeticException
 if numeric overflow occurs

plusMillis
Returns a copy of this duration with the specified duration in milliseconds added.This instance is immutable and unaffected by this method call.
 Parameters:
millisToAdd
 the milliseconds to add, positive or negative Returns:
 a
Duration
based on this duration with the specified milliseconds added, not null  Throws:
ArithmeticException
 if numeric overflow occurs

plusNanos
Returns a copy of this duration with the specified duration in nanoseconds added.This instance is immutable and unaffected by this method call.
 Parameters:
nanosToAdd
 the nanoseconds to add, positive or negative Returns:
 a
Duration
based on this duration with the specified nanoseconds added, not null  Throws:
ArithmeticException
 if numeric overflow occurs

minus
Returns a copy of this duration with the specified duration subtracted.This instance is immutable and unaffected by this method call.
 Parameters:
duration
 the duration to subtract, positive or negative, not null Returns:
 a
Duration
based on this duration with the specified duration subtracted, not null  Throws:
ArithmeticException
 if numeric overflow occurs

minus
Returns a copy of this duration with the specified duration subtracted.The duration amount is measured in terms of the specified unit. Only a subset of units are accepted by this method. The unit must either have an exact duration or be
ChronoUnit.DAYS
which is treated as 24 hours. Other units throw an exception.This instance is immutable and unaffected by this method call.
 Parameters:
amountToSubtract
 the amount to subtract, measured in terms of the unit, positive or negativeunit
 the unit that the amount is measured in, must have an exact duration, not null Returns:
 a
Duration
based on this duration with the specified duration subtracted, not null  Throws:
ArithmeticException
 if numeric overflow occurs

minusDays
Returns a copy of this duration with the specified duration in standard 24 hour days subtracted.The number of days is multiplied by 86400 to obtain the number of seconds to subtract. This is based on the standard definition of a day as 24 hours.
This instance is immutable and unaffected by this method call.
 Parameters:
daysToSubtract
 the days to subtract, positive or negative Returns:
 a
Duration
based on this duration with the specified days subtracted, not null  Throws:
ArithmeticException
 if numeric overflow occurs

minusHours
Returns a copy of this duration with the specified duration in hours subtracted.The number of hours is multiplied by 3600 to obtain the number of seconds to subtract.
This instance is immutable and unaffected by this method call.
 Parameters:
hoursToSubtract
 the hours to subtract, positive or negative Returns:
 a
Duration
based on this duration with the specified hours subtracted, not null  Throws:
ArithmeticException
 if numeric overflow occurs

minusMinutes
Returns a copy of this duration with the specified duration in minutes subtracted.The number of hours is multiplied by 60 to obtain the number of seconds to subtract.
This instance is immutable and unaffected by this method call.
 Parameters:
minutesToSubtract
 the minutes to subtract, positive or negative Returns:
 a
Duration
based on this duration with the specified minutes subtracted, not null  Throws:
ArithmeticException
 if numeric overflow occurs

minusSeconds
Returns a copy of this duration with the specified duration in seconds subtracted.This instance is immutable and unaffected by this method call.
 Parameters:
secondsToSubtract
 the seconds to subtract, positive or negative Returns:
 a
Duration
based on this duration with the specified seconds subtracted, not null  Throws:
ArithmeticException
 if numeric overflow occurs

minusMillis
Returns a copy of this duration with the specified duration in milliseconds subtracted.This instance is immutable and unaffected by this method call.
 Parameters:
millisToSubtract
 the milliseconds to subtract, positive or negative Returns:
 a
Duration
based on this duration with the specified milliseconds subtracted, not null  Throws:
ArithmeticException
 if numeric overflow occurs

minusNanos
Returns a copy of this duration with the specified duration in nanoseconds subtracted.This instance is immutable and unaffected by this method call.
 Parameters:
nanosToSubtract
 the nanoseconds to subtract, positive or negative Returns:
 a
Duration
based on this duration with the specified nanoseconds subtracted, not null  Throws:
ArithmeticException
 if numeric overflow occurs

multipliedBy
Returns a copy of this duration multiplied by the scalar.This instance is immutable and unaffected by this method call.
 Parameters:
multiplicand
 the value to multiply the duration by, positive or negative Returns:
 a
Duration
based on this duration multiplied by the specified scalar, not null  Throws:
ArithmeticException
 if numeric overflow occurs

dividedBy
Returns a copy of this duration divided by the specified value.This instance is immutable and unaffected by this method call.
 Parameters:
divisor
 the value to divide the duration by, positive or negative, not zero Returns:
 a
Duration
based on this duration divided by the specified divisor, not null  Throws:
ArithmeticException
 if the divisor is zero or if numeric overflow occurs

dividedBy
Returns number of whole times a specified Duration occurs within this Duration.This instance is immutable and unaffected by this method call.
 Parameters:
divisor
 the value to divide the duration by, positive or negative, not null Returns:
 number of whole times, rounded toward zero, a specified
Duration
occurs within this Duration, may be negative  Throws:
ArithmeticException
 if the divisor is zero, or if numeric overflow occurs Since:
 9

negated
Returns a copy of this duration with the length negated.This method swaps the sign of the total length of this duration. For example,
PT1.3S
will be returned asPT1.3S
.This instance is immutable and unaffected by this method call.
 Returns:
 a
Duration
based on this duration with the amount negated, not null  Throws:
ArithmeticException
 if numeric overflow occurs

abs
Returns a copy of this duration with a positive length.This method returns a positive duration by effectively removing the sign from any negative total length. For example,
PT1.3S
will be returned asPT1.3S
.This instance is immutable and unaffected by this method call.
 Returns:
 a
Duration
based on this duration with an absolute length, not null  Throws:
ArithmeticException
 if numeric overflow occurs

addTo
Adds this duration to the specified temporal object.This returns a temporal object of the same observable type as the input with this duration added.
In most cases, it is clearer to reverse the calling pattern by using
Temporal.plus(TemporalAmount)
.// these two lines are equivalent, but the second approach is recommended dateTime = thisDuration.addTo(dateTime); dateTime = dateTime.plus(thisDuration);
The calculation will add the seconds, then nanos. Only nonzero amounts will be added.
This instance is immutable and unaffected by this method call.
 Specified by:
addTo
in interfaceTemporalAmount
 Parameters:
temporal
 the temporal object to adjust, not null Returns:
 an object of the same type with the adjustment made, not null
 Throws:
DateTimeException
 if unable to addArithmeticException
 if numeric overflow occurs

subtractFrom
Subtracts this duration from the specified temporal object.This returns a temporal object of the same observable type as the input with this duration subtracted.
In most cases, it is clearer to reverse the calling pattern by using
Temporal.minus(TemporalAmount)
.// these two lines are equivalent, but the second approach is recommended dateTime = thisDuration.subtractFrom(dateTime); dateTime = dateTime.minus(thisDuration);
The calculation will subtract the seconds, then nanos. Only nonzero amounts will be added.
This instance is immutable and unaffected by this method call.
 Specified by:
subtractFrom
in interfaceTemporalAmount
 Parameters:
temporal
 the temporal object to adjust, not null Returns:
 an object of the same type with the adjustment made, not null
 Throws:
DateTimeException
 if unable to subtractArithmeticException
 if numeric overflow occurs

toDays
public long toDays()Gets the number of days in this duration.This returns the total number of days in the duration by dividing the number of seconds by 86400. This is based on the standard definition of a day as 24 hours.
This instance is immutable and unaffected by this method call.
 Returns:
 the number of days in the duration, may be negative

toHours
public long toHours()Gets the number of hours in this duration.This returns the total number of hours in the duration by dividing the number of seconds by 3600.
This instance is immutable and unaffected by this method call.
 Returns:
 the number of hours in the duration, may be negative

toMinutes
public long toMinutes()Gets the number of minutes in this duration.This returns the total number of minutes in the duration by dividing the number of seconds by 60.
This instance is immutable and unaffected by this method call.
 Returns:
 the number of minutes in the duration, may be negative

toSeconds
public long toSeconds()Gets the number of seconds in this duration.This returns the total number of whole seconds in the duration.
This instance is immutable and unaffected by this method call.
 Returns:
 the whole seconds part of the length of the duration, positive or negative
 Since:
 9

toMillis
public long toMillis()Converts this duration to the total length in milliseconds.If this duration is too large to fit in a
long
milliseconds, then an exception is thrown.If this duration has greater than millisecond precision, then the conversion will drop any excess precision information as though the amount in nanoseconds was subject to integer division by one million.
 Returns:
 the total length of the duration in milliseconds
 Throws:
ArithmeticException
 if numeric overflow occurs

toNanos
public long toNanos()Converts this duration to the total length in nanoseconds expressed as along
.If this duration is too large to fit in a
long
nanoseconds, then an exception is thrown. Returns:
 the total length of the duration in nanoseconds
 Throws:
ArithmeticException
 if numeric overflow occurs

toDaysPart
public long toDaysPart()Extracts the number of days in the duration.This returns the total number of days in the duration by dividing the number of seconds by 86400. This is based on the standard definition of a day as 24 hours.
This instance is immutable and unaffected by this method call.
 Returns:
 the number of days in the duration, may be negative
 Since:
 9

toHoursPart
public int toHoursPart()Extracts the number of hours part in the duration.This returns the number of remaining hours when dividing
toHours()
by hours in a day. This is based on the standard definition of a day as 24 hours.This instance is immutable and unaffected by this method call.
 Returns:
 the number of hours part in the duration, may be negative
 Since:
 9

toMinutesPart
public int toMinutesPart()Extracts the number of minutes part in the duration.This returns the number of remaining minutes when dividing
toMinutes()
by minutes in an hour. This is based on the standard definition of an hour as 60 minutes.This instance is immutable and unaffected by this method call.
 Returns:
 the number of minutes parts in the duration, may be negative
 Since:
 9

toSecondsPart
public int toSecondsPart()Extracts the number of seconds part in the duration.This returns the remaining seconds when dividing
toSeconds()
by seconds in a minute. This is based on the standard definition of a minute as 60 seconds.This instance is immutable and unaffected by this method call.
 Returns:
 the number of seconds parts in the duration, may be negative
 Since:
 9

toMillisPart
public int toMillisPart()Extracts the number of milliseconds part of the duration.This returns the milliseconds part by dividing the number of nanoseconds by 1,000,000. The length of the duration is stored using two fields  seconds and nanoseconds. The nanoseconds part is a value from 0 to 999,999,999 that is an adjustment to the length in seconds. The total duration is defined by calling
getNano()
andgetSeconds()
.This instance is immutable and unaffected by this method call.
 Returns:
 the number of milliseconds part of the duration.
 Since:
 9

toNanosPart
public int toNanosPart()Get the nanoseconds part within seconds of the duration.The length of the duration is stored using two fields  seconds and nanoseconds. The nanoseconds part is a value from 0 to 999,999,999 that is an adjustment to the length in seconds. The total duration is defined by calling
getNano()
andgetSeconds()
.This instance is immutable and unaffected by this method call.
 Returns:
 the nanoseconds within the second part of the length of the duration, from 0 to 999,999,999
 Since:
 9

truncatedTo
Returns a copy of thisDuration
truncated to the specified unit.Truncating the duration returns a copy of the original with conceptual fields smaller than the specified unit set to zero. For example, truncating with the
MINUTES
unit will round down towards zero to the nearest minute, setting the seconds and nanoseconds to zero.The unit must have a duration that divides into the length of a standard day without remainder. This includes all timebased units on {@code ChronoUnit} and
DAYS
. Other ChronoUnits throw an exception.This instance is immutable and unaffected by this method call.
 Parameters:
unit
 the unit to truncate to, not null Returns:
 a
Duration
based on this duration with the time truncated, not null  Throws:
DateTimeException
 if the unit is invalid for truncationUnsupportedTemporalTypeException
 if the unit is not supported Since:
 9

compareTo
Compares this duration to the specifiedDuration
.The comparison is based on the total length of the durations. It is "consistent with equals", as defined by
Comparable
. Specified by:
compareTo
in interfaceComparable<Duration>
 Parameters:
otherDuration
 the other duration to compare to, not null Returns:
 the comparator value, negative if less, positive if greater

equals
Checks if this duration is equal to the specifiedDuration
.The comparison is based on the total length of the durations.
 Overrides:
equals
in classObject
 Parameters:
otherDuration
 the other duration, null returns false Returns:
 true if the other duration is equal to this one
 See Also:
Object.hashCode()
,HashMap

hashCode
public int hashCode()A hash code for this duration. Overrides:
hashCode
in classObject
 Returns:
 a suitable hash code
 See Also:
Object.equals(java.lang.Object)
,System.identityHashCode(java.lang.Object)

toString
A string representation of this duration using ISO8601 seconds based representation, such asPT8H6M12.345S
.The format of the returned string will be
PTnHnMnS
, where n is the relevant hours, minutes or seconds part of the duration. Any fractional seconds are placed after a decimal point in the seconds section. If a section has a zero value, it is omitted. The hours, minutes and seconds will all have the same sign.Examples:
"20.345 seconds"  "PT20.345S "15 minutes" (15 * 60 seconds)  "PT15M" "10 hours" (10 * 3600 seconds)  "PT10H" "2 days" (2 * 86400 seconds)  "PT48H"
Note that multiples of 24 hours are not output as days to avoid confusion withPeriod
.
