# 1.3.0[−][src]Struct core::time::Duration

    pub struct Duration { /* fields omitted */ }

A `Duration` type to represent a span of time, typically used for system timeouts.

Each `Duration` is composed of a whole number of seconds and a fractional part represented in nanoseconds. If the underlying system does not support nanosecond-level precision, APIs binding a system timeout will typically round up the number of nanoseconds.

`Duration`s implement many common traits, including `Add`, `Sub`, and other `ops` traits.

# Examples

    use std::time::Duration;

    let five_seconds = Duration::new(5, 0);
    let five_seconds_and_five_nanos = five_seconds + Duration::new(0, 5);

    assert_eq!(five_seconds_and_five_nanos.as_secs(), 5);
    assert_eq!(five_seconds_and_five_nanos.subsec_nanos(), 5);

    let ten_millis = Duration::from_millis(10);Run

## Methods

### `impl Duration`[src]

#### `pub fn new(secs: u64, nanos: u32) -> Duration`[src]

Creates a new `Duration` from the specified number of whole seconds and additional nanoseconds.

If the number of nanoseconds is greater than 1 billion (the number of nanoseconds in a second), then it will carry over into the seconds provided.

# Panics

This constructor will panic if the carry from the nanoseconds overflows the seconds counter.

# Examples

    use std::time::Duration;

    let five_seconds = Duration::new(5, 0);Run

#### `pub const fn from_secs(secs: u64) -> Duration`[src]

Creates a new `Duration` from the specified number of whole seconds.

# Examples

    use std::time::Duration;

    let duration = Duration::from_secs(5);

    assert_eq!(5, duration.as_secs());
    assert_eq!(0, duration.subsec_nanos());Run

#### `pub const fn from_millis(millis: u64) -> Duration`[src]

Creates a new `Duration` from the specified number of milliseconds.

# Examples

    use std::time::Duration;

    let duration = Duration::from_millis(2569);

    assert_eq!(2, duration.as_secs());
    assert_eq!(569_000_000, duration.subsec_nanos());Run

#### `pub const fn from_micros(micros: u64) -> Duration`
1.27.0
[src]

Creates a new `Duration` from the specified number of microseconds.

# Examples

    use std::time::Duration;

    let duration = Duration::from_micros(1_000_002);

    assert_eq!(1, duration.as_secs());
    assert_eq!(2000, duration.subsec_nanos());Run

#### `pub const fn from_nanos(nanos: u64) -> Duration`
1.27.0
[src]

Creates a new `Duration` from the specified number of nanoseconds.

# Examples

    use std::time::Duration;

    let duration = Duration::from_nanos(1_000_000_123);

    assert_eq!(1, duration.as_secs());
    assert_eq!(123, duration.subsec_nanos());Run

#### `pub const fn as_secs(&self) -> u64`[src]

Returns the number of whole seconds contained by this `Duration`.

The returned value does not include the fractional (nanosecond) part of the duration, which can be obtained using `subsec_nanos`.

# Examples

    use std::time::Duration;

    let duration = Duration::new(5, 730023852);
    assert_eq!(duration.as_secs(), 5);Run

To determine the total number of seconds represented by the `Duration`, use `as_secs` in combination with `subsec_nanos`:

    use std::time::Duration;

    let duration = Duration::new(5, 730023852);

    assert_eq!(5.730023852,
               duration.as_secs() as f64
               + duration.subsec_nanos() as f64 * 1e-9);Run

#### `pub const fn subsec_millis(&self) -> u32`
1.27.0
[src]

Returns the fractional part of this `Duration`, in whole milliseconds.

This method does not return the length of the duration when represented by milliseconds. The returned number always represents a fractional portion of a second (i.e., it is less than one thousand).

# Examples

    use std::time::Duration;

    let duration = Duration::from_millis(5432);
    assert_eq!(duration.as_secs(), 5);
    assert_eq!(duration.subsec_millis(), 432);Run

#### `pub const fn subsec_micros(&self) -> u32`
1.27.0
[src]

Returns the fractional part of this `Duration`, in whole microseconds.

This method does not return the length of the duration when represented by microseconds. The returned number always represents a fractional portion of a second (i.e., it is less than one million).

# Examples

    use std::time::Duration;

    let duration = Duration::from_micros(1_234_567);
    assert_eq!(duration.as_secs(), 1);
    assert_eq!(duration.subsec_micros(), 234_567);Run

#### `pub const fn subsec_nanos(&self) -> u32`[src]

Returns the fractional part of this `Duration`, in nanoseconds.

This method does not return the length of the duration when represented by nanoseconds. The returned number always represents a fractional portion of a second (i.e., it is less than one billion).

# Examples

    use std::time::Duration;

    let duration = Duration::from_millis(5010);
    assert_eq!(duration.as_secs(), 5);
    assert_eq!(duration.subsec_nanos(), 10_000_000);Run

#### `pub const fn as_millis(&self) -> u128`
1.33.0
[src]

Returns the total number of whole milliseconds contained by this `Duration`.

# Examples

    use std::time::Duration;

    let duration = Duration::new(5, 730023852);
    assert_eq!(duration.as_millis(), 5730);Run

#### `pub const fn as_micros(&self) -> u128`
1.33.0
[src]

Returns the total number of whole microseconds contained by this `Duration`.

# Examples

    use std::time::Duration;

    let duration = Duration::new(5, 730023852);
    assert_eq!(duration.as_micros(), 5730023);Run

#### `pub const fn as_nanos(&self) -> u128`
1.33.0
[src]

Returns the total number of nanoseconds contained by this `Duration`.

# Examples

    use std::time::Duration;

    let duration = Duration::new(5, 730023852);
    assert_eq!(duration.as_nanos(), 5730023852);Run

#### `pub fn checked_add(self, rhs: Duration) -> Option<Duration>`
1.16.0
[src]

Checked `Duration` addition. Computes `self + other`, returning `None` if overflow occurred.

# Examples

Basic usage:

    use std::time::Duration;

    assert_eq!(Duration::new(0, 0).checked_add(Duration::new(0, 1)), Some(Duration::new(0, 1)));
    assert_eq!(Duration::new(1, 0).checked_add(Duration::new(std::u64::MAX, 0)), None);Run

#### `pub fn checked_sub(self, rhs: Duration) -> Option<Duration>`
1.16.0
[src]

Checked `Duration` subtraction. Computes `self - other`, returning `None` if the result would be negative or if overflow occurred.

# Examples

Basic usage:

    use std::time::Duration;

    assert_eq!(Duration::new(0, 1).checked_sub(Duration::new(0, 0)), Some(Duration::new(0, 1)));
    assert_eq!(Duration::new(0, 0).checked_sub(Duration::new(0, 1)), None);Run

#### `pub fn checked_mul(self, rhs: u32) -> Option<Duration>`
1.16.0
[src]

Checked `Duration` multiplication. Computes `self * other`, returning `None` if overflow occurred.

# Examples

Basic usage:

    use std::time::Duration;

    assert_eq!(Duration::new(0, 500_000_001).checked_mul(2), Some(Duration::new(1, 2)));
    assert_eq!(Duration::new(std::u64::MAX - 1, 0).checked_mul(2), None);Run

#### `pub fn checked_div(self, rhs: u32) -> Option<Duration>`
1.16.0
[src]

Checked `Duration` division. Computes `self / other`, returning `None` if `other == 0`.

# Examples

Basic usage:

    use std::time::Duration;

    assert_eq!(Duration::new(2, 0).checked_div(2), Some(Duration::new(1, 0)));
    assert_eq!(Duration::new(1, 0).checked_div(2), Some(Duration::new(0, 500_000_000)));
    assert_eq!(Duration::new(2, 0).checked_div(0), None);Run

#### `pub const fn as_float_secs(&self) -> f64`[src]

🔬 This is a nightly-only experimental API. (`duration_float` #54361)

Returns the number of seconds contained by this `Duration` as `f64`.

The returned value does include the fractional (nanosecond) part of the duration.

# Examples

    #![feature(duration_float)]
    use std::time::Duration;

    let dur = Duration::new(2, 700_000_000);
    assert_eq!(dur.as_float_secs(), 2.7);Run

#### `pub fn from_float_secs(secs: f64) -> Duration`[src]

🔬 This is a nightly-only experimental API. (`duration_float` #54361)

Creates a new `Duration` from the specified number of seconds.

# Panics

This constructor will panic if `secs` is not finite, negative or overflows `Duration`.

# Examples

    #![feature(duration_float)]
    use std::time::Duration;

    let dur = Duration::from_float_secs(2.7);
    assert_eq!(dur, Duration::new(2, 700_000_000));Run

#### `pub fn mul_f64(self, rhs: f64) -> Duration`[src]

🔬 This is a nightly-only experimental API. (`duration_float` #54361)

Multiply `Duration` by `f64`.

# Panics

This method will panic if result is not finite, negative or overflows `Duration`.

# Examples

    #![feature(duration_float)]
    use std::time::Duration;

    let dur = Duration::new(2, 700_000_000);
    assert_eq!(dur.mul_f64(3.14), Duration::new(8, 478_000_000));
    assert_eq!(dur.mul_f64(3.14e5), Duration::new(847_800, 0));Run

#### `pub fn div_f64(self, rhs: f64) -> Duration`[src]

🔬 This is a nightly-only experimental API. (`duration_float` #54361)

Divide `Duration` by `f64`.

# Panics

This method will panic if result is not finite, negative or overflows `Duration`.

# Examples

    #![feature(duration_float)]
    use std::time::Duration;

    let dur = Duration::new(2, 700_000_000);
    assert_eq!(dur.div_f64(3.14), Duration::new(0, 859_872_611));
    // note that truncation is used, not rounding
    assert_eq!(dur.div_f64(3.14e5), Duration::new(0, 8_598));Run

#### `pub fn div_duration(self, rhs: Duration) -> f64`[src]

🔬 This is a nightly-only experimental API. (`duration_float` #54361)

Divide `Duration` by `Duration` and return `f64`.

# Examples

    #![feature(duration_float)]
    use std::time::Duration;

    let dur1 = Duration::new(2, 700_000_000);
    let dur2 = Duration::new(5, 400_000_000);
    assert_eq!(dur1.div_duration(dur2), 0.5);Run

## Trait Implementations

### `impl Copy for Duration`[src]

### `impl Add<Duration> for Duration`[src]

#### `type Output = Duration`

The resulting type after applying the `+` operator.

#### `fn add(self, rhs: Duration) -> Duration`[src]

Performs the `+` operation.

### `impl Sub<Duration> for Duration`[src]

#### `type Output = Duration`

The resulting type after applying the `-` operator.

#### `fn sub(self, rhs: Duration) -> Duration`[src]

Performs the `-` operation.

### `impl Mul<u32> for Duration`[src]

#### `type Output = Duration`

The resulting type after applying the `*` operator.

#### `fn mul(self, rhs: u32) -> Duration`[src]

Performs the `*` operation.

### `impl Mul<Duration> for u32`
1.31.0
[src]

#### `type Output = Duration`

The resulting type after applying the `*` operator.

#### `fn mul(self, rhs: Duration) -> Duration`[src]

Performs the `*` operation.

### `impl Div<u32> for Duration`[src]

#### `type Output = Duration`

The resulting type after applying the `/` operator.

#### `fn div(self, rhs: u32) -> Duration`[src]

Performs the `/` operation.

### `impl AddAssign<Duration> for Duration`
1.9.0
[src]

#### `fn add_assign(&mut self, rhs: Duration)`[src]

Performs the `+=` operation.

### `impl SubAssign<Duration> for Duration`
1.9.0
[src]

#### `fn sub_assign(&mut self, rhs: Duration)`[src]

Performs the `-=` operation.

### `impl MulAssign<u32> for Duration`
1.9.0
[src]

#### `fn mul_assign(&mut self, rhs: u32)`[src]

Performs the `*=` operation.

### `impl DivAssign<u32> for Duration`
1.9.0
[src]

#### `fn div_assign(&mut self, rhs: u32)`[src]

Performs the `/=` operation.

### `impl PartialEq<Duration> for Duration`[src]

#### `fn eq(&self, other: &Duration) -> bool`[src]

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Duration) -> bool`[src]

This method tests for `!=`.

### `impl Eq for Duration`[src]

### `impl Ord for Duration`[src]

#### `fn cmp(&self, other: &Duration) -> Ordering`[src]

This method returns an `Ordering` between `self` and `other`. Read more

#### `fn max(self, other: Self) -> Self where
Self: Sized,`
1.21.0
[src]

Compares and returns the maximum of two values. Read more

#### `fn min(self, other: Self) -> Self where
Self: Sized,`
1.21.0
[src]

Compares and returns the minimum of two values. Read more

### `impl PartialOrd<Duration> for Duration`[src]

#### `fn partial_cmp(&self, other: &Duration) -> Option<Ordering>`[src]

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &Duration) -> bool`[src]

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &Duration) -> bool`[src]

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &Duration) -> bool`[src]

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &Duration) -> bool`[src]

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl Clone for Duration`[src]

#### `fn clone(&self) -> Duration`[src]

Returns a copy of the value. Read more

#### `fn clone_from(&mut self, source: &Self)`
1.0.0
[src]

Performs copy-assignment from `source`. Read more

### `impl Default for Duration`[src]

#### `fn default() -> Duration`[src]

Returns the "default value" for a type. Read more

### `impl Sum<Duration> for Duration`
1.16.0
[src]

#### `fn sum<I: Iterator<Item = Duration>>(iter: I) -> Duration`[src]

Method which takes an iterator and generates `Self` from the elements by "summing up" the items. Read more

### `impl<'a> Sum<&'a Duration> for Duration`
1.16.0
[src]

#### `fn sum<I: Iterator<Item = &'a Duration>>(iter: I) -> Duration`[src]

Method which takes an iterator and generates `Self` from the elements by "summing up" the items. Read more

### `impl Hash for Duration`[src]

#### `fn hash<__H: Hasher>(&self, state: &mut __H)`[src]

Feeds this value into the given [`Hasher`]. Read more

#### `fn hash_slice<H: Hasher>(data: &[Self], state: &mut H) where
Self: Sized,` [src]

Feeds a slice of this type into the given [`Hasher`]. Read more

### `impl Debug for Duration`
1.27.0
[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result`[src]

Formats the value using the given formatter. Read more

## Auto Trait Implementations

### `impl Send for Duration`

### `impl Sync for Duration`

## Blanket Implementations

### `impl<T, U> Into for T where
U: From<T>,` [src]

#### `fn into(Self) -> U`[src]

Performs the conversion.

### `impl<T> From for T`[src]

#### `fn from(T) -> T`[src]

Performs the conversion.

### `impl<T, U> TryInto for T where
U: TryFrom<T>,` [src]

#### `type Error = <U as TryFrom<T>>::Error`

🔬 This is a nightly-only experimental API. (`try_from` #33417)

The type returned in the event of a conversion error.

#### `fn try_into(Self) -> Result<U, <U as TryFrom<T>>::Error>`[src]

🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

### `impl<T, U> TryFrom for T where
T: From<U>,` [src]

#### `type Error = !`

🔬 This is a nightly-only experimental API. (`try_from` #33417)

The type returned in the event of a conversion error.

#### `fn try_from(U) -> Result<T, <T as TryFrom<U>>::Error>`[src]

🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

### `impl<T> Borrow for T where
T: ?Sized,` [src]

#### `fn borrow(&Self) -> &T`[src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut for T where
T: ?Sized,` [src]

#### `fn borrow_mut(&mut Self) -> &mut T`[src]

Mutably borrows from an owned value. Read more

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `fn get_type_id(&Self) -> TypeId`[src]

🔬 This is a nightly-only experimental API. (`get_type_id` #27745)

this method will likely be replaced by an associated static

Gets the `TypeId` of `self`. Read more

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