Trait SystemTimeExt 

pub trait SystemTimeExt: Sealed {
    // Required methods
    fn checked_add_signed(&self, duration: SignedDuration) -> Option<Self>;
    fn checked_sub_signed(&self, duration: SignedDuration) -> Option<Self>;
    fn signed_duration_since(&self, earlier: Self) -> SignedDuration;
}

Available on crate feature std only.

An extension trait for std::time::SystemTime that adds methods for time::SignedDurations.

Required Methods

fn checked_add_signed(&self, duration: SignedDuration) -> Option<Self>

Adds the given SignedDuration to the SystemTime, returning None is the result cannot be represented by the underlying data structure.

fn checked_sub_signed(&self, duration: SignedDuration) -> Option<Self>

Subtracts the given SignedDuration from the SystemTime, returning None is the result cannot be represented by the underlying data structure.

fn signed_duration_since(&self, earlier: Self) -> SignedDuration

Returns the amount of time elapsed from another SystemTime to this one. This will be negative if earlier is later than self.

If the duration cannot be stored by SignedDuration, the value will be saturated to SignedDuration::MIN or SignedDuration::MAX as appropriate.

Example

let epoch = SystemTime::UNIX_EPOCH;
let other = epoch + 1.seconds();
assert_eq!(other.signed_duration_since(epoch), 1.seconds());
assert_eq!(epoch.signed_duration_since(other), (-1).seconds());

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl SystemTimeExt for SystemTime

fn checked_add_signed(&self, duration: SignedDuration) -> Option<Self>

fn checked_sub_signed(&self, duration: SignedDuration) -> Option<Self>

fn signed_duration_since(&self, earlier: Self) -> SignedDuration

Implementors