pub struct Instant { /* private fields */ }Expand description
A measurement of a monotonically nondecreasing clock.
Opaque and useful only with Duration.
Instants are always guaranteed to be no less than any previously measured instant when created, and are often useful for tasks such as measuring benchmarks or timing how long an operation takes.
Note, however, that instants are not guaranteed to be steady. In other words, each tick of the underlying clock may not be the same length (e.g. some seconds may be longer than others). An instant may jump forwards or experience time dilation (slow down or speed up), but it will never go backwards.
Instants are opaque types that can only be compared to one another. There is no method to get “the number of seconds” from an instant. Instead, it only allows measuring the duration between two instants (or comparing two instants).
The size of an Instant struct may vary depending on the target operating
system.
Implementations§
Source§impl Instant
impl Instant
Sourcepub fn now() -> Instant
pub fn now() -> Instant
Returns an instant corresponding to now.
§Examples
use time::{Duration, Instant};
let instant = Instant::now();Sourcepub fn duration_since(&self, earlier: Instant) -> Duration
pub fn duration_since(&self, earlier: Instant) -> Duration
Returns the amount of time elapsed from another instant to this one, or zero duration if that instant is later than this one.
§Examples
use time::{Duration, Instant};
let instant = Instant::now();
let three_secs = Duration::from_secs(3);
time::sleep(three_secs).await;
let now = Instant::now();
let duration_since = now.duration_since(instant);Sourcepub fn elapsed(&self) -> Duration
pub fn elapsed(&self) -> Duration
Returns the amount of time elapsed since this instant was created, or zero duration if that this instant is in the future.
§Examples
use time::{Duration, Instant};
let instant = Instant::now();
let three_secs = Duration::from_secs(3);
time::sleep(three_secs).await;
let elapsed = instant.elapsed();