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Duration class

A span of time, such as 27 days, 4 hours, 12 minutes, and 3 seconds.

A Duration represents a difference from one point in time to another. The duration may be "negative" if the difference is from a later time to an earlier.

Durations are context independent. For example, a duration of 2 days is always 48 hours, even when it is added to a DateTime just when the time zone is about to make a daylight-savings switch. (See DateTime.add).

Despite the same name, a Duration object does not implement "Durations" as specified by ISO 8601. In particular, a duration object does not keep track of the individually provided members (such as "days" or "hours"), but only uses these arguments to compute the length of the corresponding time interval.

To create a new Duration object, use this class's single constructor giving the appropriate arguments:

const fastestMarathon = Duration(hours: 2, minutes: 3, seconds: 2);

The Duration represents a single number of microseconds, which is the sum of all the individual arguments to the constructor.

Properties can access that single number in different ways. For example the inMinutes gives the number of whole minutes in the total duration, which includes the minutes that were provided as "hours" to the constructor, and can be larger than 59.

const fastestMarathon = Duration(hours: 2, minutes: 3, seconds: 2);
print(fastestMarathon.inDays); // 0
print(fastestMarathon.inHours); // 2
print(fastestMarathon.inMinutes); // 123
print(fastestMarathon.inSeconds); // 7382
print(fastestMarathon.inMilliseconds); // 7382000

The duration can be negative, in which case all the properties derived from the duration are also non-positive.

const overDayAgo = Duration(days: -1, hours: -10);
print(overDayAgo.inDays); // -1
print(overDayAgo.inHours); // -34
print(overDayAgo.inMinutes); // -2040

Use one of the properties, such as inDays, to retrieve the integer value of the Duration in the specified time unit. Note that the returned value is rounded down. For example,

const aLongWeekend = Duration(hours: 88);
print(aLongWeekend.inDays); // 3

This class provides a collection of arithmetic and comparison operators, plus a set of constants useful for converting time units.

const firstHalf = Duration(minutes: 45); // 00:45:00.000000
const secondHalf = Duration(minutes: 45); // 00:45:00.000000
const overTime = Duration(minutes: 30); // 00:30:00.000000
final maxGameTime = firstHalf + secondHalf + overTime;
print(maxGameTime.inMinutes); // 120

// The duration of the firstHalf and secondHalf is the same, returns 0.
var result = firstHalf.compareTo(secondHalf);
print(result); // 0

// Duration of overTime is shorter than firstHalf, returns < 0.
result = overTime.compareTo(firstHalf);
print(result); // < 0

// Duration of secondHalf is longer than overTime, returns > 0.
result = secondHalf.compareTo(overTime);
print(result); // > 0

See also:

Implemented types

Constructors

Duration({int days = 0, int hours = 0, int minutes = 0, int seconds = 0, int milliseconds = 0, int microseconds = 0})
const
Creates a new Duration object whose value is the sum of all individual parts.

Properties

hashCode → int
read-only, override
The hash code for this object.
inDays → int
read-only
The number of entire days spanned by this Duration.
inHours → int
read-only
The number of entire hours spanned by this Duration.
inMicroseconds → int
read-only
The number of whole microseconds spanned by this Duration.
inMilliseconds → int
read-only
The number of whole milliseconds spanned by this Duration.
inMinutes → int
read-only
The number of whole minutes spanned by this Duration.
inSeconds → int
read-only
The number of whole seconds spanned by this Duration.
isNegative → bool
read-only
Whether this Duration is negative.
runtimeType → Type
read-only, inherited
A representation of the runtime type of the object.

Methods

abs() → Duration
Creates a new Duration representing the absolute length of this Duration.
compareTo(Duration other) → int
override
Compares this Duration to other, returning zero if the values are equal.
noSuchMethod(Invocation invocation) → dynamic
inherited
Invoked when a non-existent method or property is accessed.
toString() → String
override
Returns a string representation of this Duration.

Operators

operator *(num factor) → Duration
Multiplies this Duration by the given factor and returns the result as a new Duration object.
operator +(Duration other) → Duration
Adds this Duration and other and returns the sum as a new Duration object.
operator -(Duration other) → Duration
Subtracts other from this Duration and returns the difference as a new Duration object.
operator <(Duration other) → bool
Whether this Duration is shorter than other.
operator <=(Duration other) → bool
Whether this Duration is shorter than or equal to other.
operator ==(Object other) → bool
override
Whether this Duration has the same length as other.
operator >(Duration other) → bool
Whether this Duration is longer than other.
operator >=(Duration other) → bool
Whether this Duration is longer than or equal to other.
operator unary-() → Duration
Creates a new Duration with the opposite direction of this Duration.
operator ~/(int quotient) → Duration
Divides this Duration by the given quotient and returns the truncated result as a new Duration object.

Constants

hoursPerDay → const int
The number of hours per day.
24
microsecondsPerDay → const int
The number of microseconds per day.
microsecondsPerHour * hoursPerDay
microsecondsPerHour → const int
The number of microseconds per hour.
microsecondsPerMinute * minutesPerHour
microsecondsPerMillisecond → const int
The number of microseconds per millisecond.
1000
microsecondsPerMinute → const int
The number of microseconds per minute.
microsecondsPerSecond * secondsPerMinute
microsecondsPerSecond → const int
The number of microseconds per second.
microsecondsPerMillisecond * millisecondsPerSecond
millisecondsPerDay → const int
The number of milliseconds per day.
millisecondsPerHour * hoursPerDay
millisecondsPerHour → const int
The number of milliseconds per hour.
millisecondsPerMinute * minutesPerHour
millisecondsPerMinute → const int
The number of milliseconds per minute.
millisecondsPerSecond * secondsPerMinute
millisecondsPerSecond → const int
The number of milliseconds per second.
1000
minutesPerDay → const int
The number of minutes per day.
minutesPerHour * hoursPerDay
minutesPerHour → const int
The number of minutes per hour.
60
secondsPerDay → const int
The number of seconds per day.
secondsPerHour * hoursPerDay
secondsPerHour → const int
The number of seconds per hour.
secondsPerMinute * minutesPerHour
secondsPerMinute → const int
The number of seconds per minute.
60
zero → const Duration
An empty duration, representing zero time.
Duration(seconds: 0)

© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-core/Duration-class.html