Duration in core::time - Rust
Description: A `Duration` type to represent a span of time, typically used for system timeouts.

## Duration

# Struct Duration

1.25.0 · Source

    pub struct Duration { /* private fields */ }

Expand description

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. It implements `Default` by returning a zero-length `Duration`.

## §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);

## §Formatting `Duration` values

`Duration` intentionally does not have a `Display` impl, as there are a variety of ways to format spans of time for human readability. `Duration` provides a `Debug` impl that shows the full precision of the value.

The `Debug` output uses the non-ASCII “µs” suffix for microseconds. If your program output may appear in contexts that cannot rely on full Unicode compatibility, you may wish to format `Duration` objects yourself or use a crate to do so.

## Implementations§

Source§

### impl Duration

Source

#### pub const SECOND: Duration

🔬This is a nightly-only experimental API. (`duration_constants` #57391)

The duration of one second.

##### §Examples

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

    assert_eq!(Duration::SECOND, Duration::from_secs(1));

Source

#### pub const MILLISECOND: Duration

🔬This is a nightly-only experimental API. (`duration_constants` #57391)

The duration of one millisecond.

##### §Examples

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

    assert_eq!(Duration::MILLISECOND, Duration::from_millis(1));

Source

#### pub const MICROSECOND: Duration

🔬This is a nightly-only experimental API. (`duration_constants` #57391)

The duration of one microsecond.

##### §Examples

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

    assert_eq!(Duration::MICROSECOND, Duration::from_micros(1));

Source

#### pub const NANOSECOND: Duration

🔬This is a nightly-only experimental API. (`duration_constants` #57391)

The duration of one nanosecond.

##### §Examples

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

    assert_eq!(Duration::NANOSECOND, Duration::from_nanos(1));

1.53.0 · Source

#### pub const ZERO: Duration

A duration of zero time.

##### §Examples

    use std::time::Duration;

    let duration = Duration::ZERO;
    assert!(duration.is_zero());
    assert_eq!(duration.as_nanos(), 0);

1.53.0 · Source

#### pub const MAX: Duration

The maximum duration.

May vary by platform as necessary. Must be able to contain the difference between two instances of `Instant` or two instances of `SystemTime`. This constraint gives it a value of about 584,942,417,355 years in practice, which is currently used on all platforms.

##### §Examples

    use std::time::Duration;

    assert_eq!(Duration::MAX, Duration::new(u64::MAX, 1_000_000_000 - 1));

1.3.0 (const: 1.58.0) · Source

#### pub const fn new(secs: u64, nanos: u32) -> Duration

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);

1.3.0 (const: 1.32.0) · Source

#### pub const fn from_secs(secs: u64) -> Duration

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());

1.3.0 (const: 1.32.0) · Source

#### pub const fn from_millis(millis: u64) -> Duration

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

##### §Examples

    use std::time::Duration;

    let duration = Duration::from_millis(2_569);

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

1.27.0 (const: 1.32.0) · Source

#### pub const fn from_micros(micros: u64) -> Duration

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!(2_000, duration.subsec_nanos());

1.27.0 (const: 1.32.0) · Source

#### pub const fn from_nanos(nanos: u64) -> Duration

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

Note: Using this on the return value of `as_nanos()` might cause unexpected behavior: `as_nanos()` returns a u128, and can return values that do not fit in u64, e.g. 585 years. Instead, consider using the pattern `Duration::new(d.as_secs(), d.subsec_nanos())` if you cannot copy/clone the Duration directly.

##### §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());

1.93.0 (const: 1.93.0) · Source

#### pub const fn from_nanos_u128(nanos: u128) -> Duration

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

##### §Panics

Panics if the given number of nanoseconds is greater than `Duration::MAX`.

##### §Examples

    use std::time::Duration;

    let nanos = 10_u128.pow(24) + 321;
    let duration = Duration::from_nanos_u128(nanos);

    assert_eq!(10_u64.pow(15), duration.as_secs());
    assert_eq!(321, duration.subsec_nanos());

Source

#### pub const fn from_weeks(weeks: u64) -> Duration

🔬This is a nightly-only experimental API. (`duration_constructors` #120301)

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

##### §Panics

Panics if the given number of weeks overflows the `Duration` size.

##### §Examples

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

    let duration = Duration::from_weeks(4);

    assert_eq!(4 * 7 * 24 * 60 * 60, duration.as_secs());
    assert_eq!(0, duration.subsec_nanos());

Source

#### pub const fn from_days(days: u64) -> Duration

🔬This is a nightly-only experimental API. (`duration_constructors` #120301)

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

##### §Panics

Panics if the given number of days overflows the `Duration` size.

##### §Examples

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

    let duration = Duration::from_days(7);

    assert_eq!(7 * 24 * 60 * 60, duration.as_secs());
    assert_eq!(0, duration.subsec_nanos());

1.91.0 (const: 1.91.0) · Source

#### pub const fn from_hours(hours: u64) -> Duration

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

##### §Panics

Panics if the given number of hours overflows the `Duration` size.

##### §Examples

    use std::time::Duration;

    let duration = Duration::from_hours(6);

    assert_eq!(6 * 60 * 60, duration.as_secs());
    assert_eq!(0, duration.subsec_nanos());

1.91.0 (const: 1.91.0) · Source

#### pub const fn from_mins(mins: u64) -> Duration

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

##### §Panics

Panics if the given number of minutes overflows the `Duration` size.

##### §Examples

    use std::time::Duration;

    let duration = Duration::from_mins(10);

    assert_eq!(10 * 60, duration.as_secs());
    assert_eq!(0, duration.subsec_nanos());

1.53.0 (const: 1.53.0) · Source

#### pub const fn is_zero(&self) -> bool

Returns true if this `Duration` spans no time.

##### §Examples

    use std::time::Duration;

    assert!(Duration::ZERO.is_zero());
    assert!(Duration::new(0, 0).is_zero());
    assert!(Duration::from_nanos(0).is_zero());
    assert!(Duration::from_secs(0).is_zero());

    assert!(!Duration::new(1, 1).is_zero());
    assert!(!Duration::from_nanos(1).is_zero());
    assert!(!Duration::from_secs(1).is_zero());

1.3.0 (const: 1.32.0) · Source

#### pub const fn as_secs(&self) -> u64

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, 730_023_852);
    assert_eq!(duration.as_secs(), 5);

To determine the total number of seconds represented by the `Duration` including the fractional part, use `as_secs_f64` or `as_secs_f32`

1.27.0 (const: 1.32.0) · Source

#### pub const fn subsec_millis(&self) -> u32

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(5_432);
    assert_eq!(duration.as_secs(), 5);
    assert_eq!(duration.subsec_millis(), 432);

1.27.0 (const: 1.32.0) · Source

#### pub const fn subsec_micros(&self) -> u32

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);

1.3.0 (const: 1.32.0) · Source

#### pub const fn subsec_nanos(&self) -> u32

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(5_010);
    assert_eq!(duration.as_secs(), 5);
    assert_eq!(duration.subsec_nanos(), 10_000_000);

1.33.0 (const: 1.33.0) · Source

#### pub const fn as_millis(&self) -> u128

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

##### §Examples

    use std::time::Duration;

    let duration = Duration::new(5, 730_023_852);
    assert_eq!(duration.as_millis(), 5_730);

1.33.0 (const: 1.33.0) · Source

#### pub const fn as_micros(&self) -> u128

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

##### §Examples

    use std::time::Duration;

    let duration = Duration::new(5, 730_023_852);
    assert_eq!(duration.as_micros(), 5_730_023);

1.33.0 (const: 1.33.0) · Source

#### pub const fn as_nanos(&self) -> u128

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

##### §Examples

    use std::time::Duration;

    let duration = Duration::new(5, 730_023_852);
    assert_eq!(duration.as_nanos(), 5_730_023_852);

1.81.0 (const: 1.81.0) · Source

#### pub const fn abs_diff(self, other: Duration) -> Duration

Computes the absolute difference between `self` and `other`.

##### §Examples

    use std::time::Duration;

    assert_eq!(Duration::new(100, 0).abs_diff(Duration::new(80, 0)), Duration::new(20, 0));
    assert_eq!(Duration::new(100, 400_000_000).abs_diff(Duration::new(110, 0)), Duration::new(9, 600_000_000));

1.16.0 (const: 1.58.0) · Source

#### pub const fn checked_add(self, rhs: Duration) -> Option<Duration>

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

##### §Examples

    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(u64::MAX, 0)), None);

1.53.0 (const: 1.58.0) · Source

#### pub const fn saturating_add(self, rhs: Duration) -> Duration

Saturating `Duration` addition. Computes `self + other`, returning `Duration::MAX` if overflow occurred.

##### §Examples

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

    assert_eq!(Duration::new(0, 0).saturating_add(Duration::new(0, 1)), Duration::new(0, 1));
    assert_eq!(Duration::new(1, 0).saturating_add(Duration::new(u64::MAX, 0)), Duration::MAX);

1.16.0 (const: 1.58.0) · Source

#### pub const fn checked_sub(self, rhs: Duration) -> Option<Duration>

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

##### §Examples

    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);

1.53.0 (const: 1.58.0) · Source

#### pub const fn saturating_sub(self, rhs: Duration) -> Duration

Saturating `Duration` subtraction. Computes `self - other`, returning `Duration::ZERO` if the result would be negative or if overflow occurred.

##### §Examples

    use std::time::Duration;

    assert_eq!(Duration::new(0, 1).saturating_sub(Duration::new(0, 0)), Duration::new(0, 1));
    assert_eq!(Duration::new(0, 0).saturating_sub(Duration::new(0, 1)), Duration::ZERO);

1.16.0 (const: 1.58.0) · Source

#### pub const fn checked_mul(self, rhs: u32) -> Option<Duration>

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

##### §Examples

    use std::time::Duration;

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

1.53.0 (const: 1.58.0) · Source

#### pub const fn saturating_mul(self, rhs: u32) -> Duration

Saturating `Duration` multiplication. Computes `self * other`, returning `Duration::MAX` if overflow occurred.

##### §Examples

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

    assert_eq!(Duration::new(0, 500_000_001).saturating_mul(2), Duration::new(1, 2));
    assert_eq!(Duration::new(u64::MAX - 1, 0).saturating_mul(2), Duration::MAX);

1.16.0 (const: 1.58.0) · Source

#### pub const fn checked_div(self, rhs: u32) -> Option<Duration>

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

##### §Examples

    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);

1.38.0 (const: 1.83.0) · Source

#### pub const fn as_secs_f64(&self) -> f64

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

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

##### §Examples

    use std::time::Duration;

    let dur = Duration::new(2, 700_000_000);
    assert_eq!(dur.as_secs_f64(), 2.7);

1.38.0 (const: 1.83.0) · Source

#### pub const fn as_secs_f32(&self) -> f32

Returns the number of seconds contained by this `Duration` as `f32`.

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

##### §Examples

    use std::time::Duration;

    let dur = Duration::new(2, 700_000_000);
    assert_eq!(dur.as_secs_f32(), 2.7);

Source

#### pub const fn as_millis_f64(&self) -> f64

🔬This is a nightly-only experimental API. (`duration_millis_float` #122451)

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

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

##### §Examples

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

    let dur = Duration::new(2, 345_678_000);
    assert_eq!(dur.as_millis_f64(), 2_345.678);

Source

#### pub const fn as_millis_f32(&self) -> f32

🔬This is a nightly-only experimental API. (`duration_millis_float` #122451)

Returns the number of milliseconds contained by this `Duration` as `f32`.

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

##### §Examples

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

    let dur = Duration::new(2, 345_678_000);
    assert_eq!(dur.as_millis_f32(), 2_345.678);

1.38.0 · Source

#### pub fn from_secs_f64(secs: f64) -> Duration

Creates a new `Duration` from the specified number of seconds represented as `f64`.

##### §Panics

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

##### §Examples

    use std::time::Duration;

    let res = Duration::from_secs_f64(0.0);
    assert_eq!(res, Duration::new(0, 0));
    let res = Duration::from_secs_f64(1e-20);
    assert_eq!(res, Duration::new(0, 0));
    let res = Duration::from_secs_f64(4.2e-7);
    assert_eq!(res, Duration::new(0, 420));
    let res = Duration::from_secs_f64(2.7);
    assert_eq!(res, Duration::new(2, 700_000_000));
    let res = Duration::from_secs_f64(3e10);
    assert_eq!(res, Duration::new(30_000_000_000, 0));
    // subnormal float
    let res = Duration::from_secs_f64(f64::from_bits(1));
    assert_eq!(res, Duration::new(0, 0));
    // conversion uses rounding
    let res = Duration::from_secs_f64(0.999e-9);
    assert_eq!(res, Duration::new(0, 1));

1.38.0 · Source

#### pub fn from_secs_f32(secs: f32) -> Duration

Creates a new `Duration` from the specified number of seconds represented as `f32`.

##### §Panics

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

##### §Examples

    use std::time::Duration;

    let res = Duration::from_secs_f32(0.0);
    assert_eq!(res, Duration::new(0, 0));
    let res = Duration::from_secs_f32(1e-20);
    assert_eq!(res, Duration::new(0, 0));
    let res = Duration::from_secs_f32(4.2e-7);
    assert_eq!(res, Duration::new(0, 420));
    let res = Duration::from_secs_f32(2.7);
    assert_eq!(res, Duration::new(2, 700_000_048));
    let res = Duration::from_secs_f32(3e10);
    assert_eq!(res, Duration::new(30_000_001_024, 0));
    // subnormal float
    let res = Duration::from_secs_f32(f32::from_bits(1));
    assert_eq!(res, Duration::new(0, 0));
    // conversion uses rounding
    let res = Duration::from_secs_f32(0.999e-9);
    assert_eq!(res, Duration::new(0, 1));

1.38.0 · Source

#### pub fn mul_f64(self, rhs: f64) -> Duration

Multiplies `Duration` by `f64`.

##### §Panics

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

##### §Examples

    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));

1.38.0 · Source

#### pub fn mul_f32(self, rhs: f32) -> Duration

Multiplies `Duration` by `f32`.

##### §Panics

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

##### §Examples

    use std::time::Duration;

    let dur = Duration::new(2, 700_000_000);
    assert_eq!(dur.mul_f32(3.14), Duration::new(8, 478_000_641));
    assert_eq!(dur.mul_f32(3.14e5), Duration::new(847_800, 0));

1.38.0 · Source

#### pub fn div_f64(self, rhs: f64) -> Duration

Divides `Duration` by `f64`.

##### §Panics

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

##### §Examples

    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));
    assert_eq!(dur.div_f64(3.14e5), Duration::new(0, 8_599));

1.38.0 · Source

#### pub fn div_f32(self, rhs: f32) -> Duration

Divides `Duration` by `f32`.

##### §Panics

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

##### §Examples

    use std::time::Duration;

    let dur = Duration::new(2, 700_000_000);
    // note that due to rounding errors result is slightly
    // different from 0.859_872_611
    assert_eq!(dur.div_f32(3.14), Duration::new(0, 859_872_580));
    assert_eq!(dur.div_f32(3.14e5), Duration::new(0, 8_599));

1.80.0 (const: 1.83.0) · Source

#### pub const fn div_duration_f64(self, rhs: Duration) -> f64

Divides `Duration` by `Duration` and returns `f64`.

##### §Examples

    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_f64(dur2), 0.5);

1.80.0 (const: 1.83.0) · Source

#### pub const fn div_duration_f32(self, rhs: Duration) -> f32

Divides `Duration` by `Duration` and returns `f32`.

##### §Examples

    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_f32(dur2), 0.5);

Source

#### pub const fn div_duration_floor(self, rhs: Duration) -> u128

🔬This is a nightly-only experimental API. (`duration_integer_division` #149573)

Divides `Duration` by `Duration` and returns `u128`, rounding the result towards zero.

##### §Examples

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

    let dur = Duration::new(2, 0);
    assert_eq!(dur.div_duration_floor(Duration::new(1, 000_000_001)), 1);
    assert_eq!(dur.div_duration_floor(Duration::new(1, 000_000_000)), 2);
    assert_eq!(dur.div_duration_floor(Duration::new(0, 999_999_999)), 2);

Source

#### pub const fn div_duration_ceil(self, rhs: Duration) -> u128

🔬This is a nightly-only experimental API. (`duration_integer_division` #149573)

Divides `Duration` by `Duration` and returns `u128`, rounding the result towards positive infinity.

##### §Examples

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

    let dur = Duration::new(2, 0);
    assert_eq!(dur.div_duration_ceil(Duration::new(1, 000_000_001)), 2);
    assert_eq!(dur.div_duration_ceil(Duration::new(1, 000_000_000)), 2);
    assert_eq!(dur.div_duration_ceil(Duration::new(0, 999_999_999)), 3);

Source§

### impl Duration

1.66.0 · Source

#### pub fn try_from_secs_f32(secs: f32) -> Result<Duration, TryFromFloatSecsError>

The checked version of `from_secs_f32`.

This constructor will return an `Err` if `secs` is negative, overflows `Duration` or not finite.

##### §Examples

    use std::time::Duration;

    let res = Duration::try_from_secs_f32(0.0);
    assert_eq!(res, Ok(Duration::new(0, 0)));
    let res = Duration::try_from_secs_f32(1e-20);
    assert_eq!(res, Ok(Duration::new(0, 0)));
    let res = Duration::try_from_secs_f32(4.2e-7);
    assert_eq!(res, Ok(Duration::new(0, 420)));
    let res = Duration::try_from_secs_f32(2.7);
    assert_eq!(res, Ok(Duration::new(2, 700_000_048)));
    let res = Duration::try_from_secs_f32(3e10);
    assert_eq!(res, Ok(Duration::new(30_000_001_024, 0)));
    // subnormal float:
    let res = Duration::try_from_secs_f32(f32::from_bits(1));
    assert_eq!(res, Ok(Duration::new(0, 0)));

    let res = Duration::try_from_secs_f32(-5.0);
    assert!(res.is_err());
    let res = Duration::try_from_secs_f32(f32::NAN);
    assert!(res.is_err());
    let res = Duration::try_from_secs_f32(2e19);
    assert!(res.is_err());

    // the conversion uses rounding with tie resolution to even
    let res = Duration::try_from_secs_f32(0.999e-9);
    assert_eq!(res, Ok(Duration::new(0, 1)));

    // this float represents exactly 976562.5e-9
    let val = f32::from_bits(0x3A80_0000);
    let res = Duration::try_from_secs_f32(val);
    assert_eq!(res, Ok(Duration::new(0, 976_562)));

    // this float represents exactly 2929687.5e-9
    let val = f32::from_bits(0x3B40_0000);
    let res = Duration::try_from_secs_f32(val);
    assert_eq!(res, Ok(Duration::new(0, 2_929_688)));

    // this float represents exactly 1.000_976_562_5
    let val = f32::from_bits(0x3F802000);
    let res = Duration::try_from_secs_f32(val);
    assert_eq!(res, Ok(Duration::new(1, 976_562)));

    // this float represents exactly 1.002_929_687_5
    let val = f32::from_bits(0x3F806000);
    let res = Duration::try_from_secs_f32(val);
    assert_eq!(res, Ok(Duration::new(1, 2_929_688)));

1.66.0 · Source

#### pub fn try_from_secs_f64(secs: f64) -> Result<Duration, TryFromFloatSecsError>

The checked version of `from_secs_f64`.

This constructor will return an `Err` if `secs` is negative, overflows `Duration` or not finite.

##### §Examples

    use std::time::Duration;

    let res = Duration::try_from_secs_f64(0.0);
    assert_eq!(res, Ok(Duration::new(0, 0)));
    let res = Duration::try_from_secs_f64(1e-20);
    assert_eq!(res, Ok(Duration::new(0, 0)));
    let res = Duration::try_from_secs_f64(4.2e-7);
    assert_eq!(res, Ok(Duration::new(0, 420)));
    let res = Duration::try_from_secs_f64(2.7);
    assert_eq!(res, Ok(Duration::new(2, 700_000_000)));
    let res = Duration::try_from_secs_f64(3e10);
    assert_eq!(res, Ok(Duration::new(30_000_000_000, 0)));
    // subnormal float
    let res = Duration::try_from_secs_f64(f64::from_bits(1));
    assert_eq!(res, Ok(Duration::new(0, 0)));

    let res = Duration::try_from_secs_f64(-5.0);
    assert!(res.is_err());
    let res = Duration::try_from_secs_f64(f64::NAN);
    assert!(res.is_err());
    let res = Duration::try_from_secs_f64(2e19);
    assert!(res.is_err());

    // the conversion uses rounding with tie resolution to even
    let res = Duration::try_from_secs_f64(0.999e-9);
    assert_eq!(res, Ok(Duration::new(0, 1)));
    let res = Duration::try_from_secs_f64(0.999_999_999_499);
    assert_eq!(res, Ok(Duration::new(0, 999_999_999)));
    let res = Duration::try_from_secs_f64(0.999_999_999_501);
    assert_eq!(res, Ok(Duration::new(1, 0)));
    let res = Duration::try_from_secs_f64(42.999_999_999_499);
    assert_eq!(res, Ok(Duration::new(42, 999_999_999)));
    let res = Duration::try_from_secs_f64(42.999_999_999_501);
    assert_eq!(res, Ok(Duration::new(43, 0)));

    // this float represents exactly 976562.5e-9
    let val = f64::from_bits(0x3F50_0000_0000_0000);
    let res = Duration::try_from_secs_f64(val);
    assert_eq!(res, Ok(Duration::new(0, 976_562)));

    // this float represents exactly 2929687.5e-9
    let val = f64::from_bits(0x3F68_0000_0000_0000);
    let res = Duration::try_from_secs_f64(val);
    assert_eq!(res, Ok(Duration::new(0, 2_929_688)));

    // this float represents exactly 1.000_976_562_5
    let val = f64::from_bits(0x3FF0_0400_0000_0000);
    let res = Duration::try_from_secs_f64(val);
    assert_eq!(res, Ok(Duration::new(1, 976_562)));

    // this float represents exactly 1.002_929_687_5
    let val = f64::from_bits(0x3_FF00_C000_0000_000);
    let res = Duration::try_from_secs_f64(val);
    assert_eq!(res, Ok(Duration::new(1, 2_929_688)));

## Trait Implementations§

1.3.0 (const: unstable) · Source§

### impl Add for Duration

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#### type Output = Duration

The resulting type after applying the `+` operator.
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#### fn add(self, rhs: Duration) -> Duration

Performs the `+` operation. Read more
1.9.0 (const: unstable) · Source§

### impl AddAssign for Duration

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#### fn add_assign(&mut self, rhs: Duration)

Performs the `+=` operation. Read more
1.3.0 · Source§

### impl Clone for Duration

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#### fn clone(&self) -> Duration

Returns a duplicate of the value. Read more
1.0.0 · Source§

#### fn clone_from(&mut self, source: &Self)
where Self:,

Performs copy-assignment from `source`. Read more
1.27.0 · Source§

### impl Debug for Duration

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
1.3.0 · Source§

### impl Default for Duration

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#### fn default() -> Duration

Returns the “default value” for a type. Read more
1.3.0 (const: unstable) · Source§

### impl Div<u32> for Duration

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#### type Output = Duration

The resulting type after applying the `/` operator.
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#### fn div(self, rhs: u32) -> Duration

Performs the `/` operation. Read more
1.9.0 (const: unstable) · Source§

### impl DivAssign<u32> for Duration

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#### fn div_assign(&mut self, rhs: u32)

Performs the `/=` operation. Read more
1.3.0 · Source§

### impl Hash for Duration

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#### fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given `Hasher`. Read more
1.3.0 · Source§

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

Feeds a slice of this type into the given `Hasher`. Read more
1.31.0 (const: unstable) · Source§

### impl Mul<Duration> for u32

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#### type Output = Duration

The resulting type after applying the `*` operator.
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#### fn mul(self, rhs: Duration) -> Duration

Performs the `*` operation. Read more
1.3.0 (const: unstable) · Source§

### impl Mul<u32> for Duration

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#### type Output = Duration

The resulting type after applying the `*` operator.
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#### fn mul(self, rhs: u32) -> Duration

Performs the `*` operation. Read more
1.9.0 (const: unstable) · Source§

### impl MulAssign<u32> for Duration

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#### fn mul_assign(&mut self, rhs: u32)

Performs the `*=` operation. Read more
1.3.0 · Source§

### impl Ord for Duration

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#### fn cmp(&self, other: &Duration) -> Ordering

This method returns an `Ordering` between `self` and `other`. Read more
1.21.0 · Source§

#### fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
1.21.0 · Source§

#### fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
1.50.0 · Source§

#### fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized,

Restrict a value to a certain interval. Read more
1.3.0 · Source§

### impl PartialEq for Duration

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#### fn eq(&self, other: &Duration) -> bool

Tests for `self` and `other` values to be equal, and is used by `==`.
1.0.0 · Source§

#### fn ne(&self, other: &Rhs) -> bool

Tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.3.0 · Source§

### impl PartialOrd for Duration

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

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

#### fn lt(&self, other: &Rhs) -> bool

Tests less than (for `self` and `other`) and is used by the `<` operator. Read more
1.0.0 · Source§

#### fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more
1.0.0 · Source§

#### fn gt(&self, other: &Rhs) -> bool

Tests greater than (for `self` and `other`) and is used by the `>` operator. Read more
1.0.0 · Source§

#### fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more
1.3.0 (const: unstable) · Source§

### impl Sub for Duration

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#### type Output = Duration

The resulting type after applying the `-` operator.
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#### fn sub(self, rhs: Duration) -> Duration

Performs the `-` operation. Read more
1.9.0 (const: unstable) · Source§

### impl SubAssign for Duration

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#### fn sub_assign(&mut self, rhs: Duration)

Performs the `-=` operation. Read more
1.16.0 · Source§

### impl<'a> Sum<&'a Duration> for Duration

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

Takes an iterator and generates `Self` from the elements by “summing up” the items.
1.16.0 · Source§

### impl Sum for Duration

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#### fn sum<I: Iterator<Item = Duration>>(iter: I) -> Duration

Takes an iterator and generates `Self` from the elements by “summing up” the items.
1.3.0 · Source§

### impl Copy for Duration

1.3.0 · Source§

### impl Eq for Duration

1.3.0 · Source§

### impl StructuralPartialEq for Duration

## Auto Trait Implementations§

§

### impl Freeze for Duration

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### impl RefUnwindSafe for Duration

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### impl Send for Duration

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### impl Sync for Duration

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### impl Unpin for Duration

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### impl UnwindSafe for Duration

## Blanket Implementations§

Source§

### impl<T> Any for T
where T: 'static + ?Sized,

Source§

#### fn type_id(&self) -> TypeId

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

### impl<T> Borrow<T> for T
where T: ?Sized,

Source§

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

### impl<T> BorrowMut<T> for T
where T: ?Sized,

Source§

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
Source§

### impl<T> CloneToUninit for T
where T: Clone,

Source§

#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit` #126799)
Performs copy-assignment from `self` to `dest`. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

Source§

### impl<T, U> Into<U> for T
where U: From<T>,

Source§

#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
Source§

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
Source§

### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
Source§

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.