Duration class Null safety

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 do 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:

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

The Duration is the sum of all individual parts. This means that individual parts can be larger than the next-bigger unit. For example, inMinutes can be greater than 59.

assert(fastestMarathon.inMinutes == 123);

All individual parts are allowed to be negative.

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,

Duration aLongWeekend = new Duration(hours:88);
assert(aLongWeekend.inDays == 3);

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

See DateTime to represent a point in time. See Stopwatch to measure time-spans.

Implemented types

Constructors

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

Properties

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

Methods

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

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
Returns true if the value of this Duration is less than the value of other.
operator <=(Duration other) bool
Returns true if the value of this Duration is less than or equal to the value of other.
operator ==(Object other) bool
Returns true if this Duration has the same value as other.
override
operator >(Duration other) bool
Returns true if the value of this Duration is greater than the value of other.
operator >=(Duration other) bool
Returns true if the value of this Duration is greater than or equal to the value of other.
operator unary-() Duration
Returns a new Duration representing this Duration negated. [...]
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
24
microsecondsPerDay → const int
microsecondsPerHour * hoursPerDay
microsecondsPerHour → const int
microsecondsPerMinute * minutesPerHour
microsecondsPerMillisecond → const int
1000
microsecondsPerMinute → const int
microsecondsPerSecond * secondsPerMinute
microsecondsPerSecond → const int
microsecondsPerMillisecond * millisecondsPerSecond
millisecondsPerDay → const int
millisecondsPerHour * hoursPerDay
millisecondsPerHour → const int
millisecondsPerMinute * minutesPerHour
millisecondsPerMinute → const int
millisecondsPerSecond * secondsPerMinute
millisecondsPerSecond → const int
1000
minutesPerDay → const int
minutesPerHour * hoursPerDay
minutesPerHour → const int
60
secondsPerDay → const int
secondsPerHour * hoursPerDay
secondsPerHour → const int
secondsPerMinute * minutesPerHour
secondsPerMinute → const int
60
zero → const Duration
const Duration(seconds: 0)