Struct Instant 

pub struct Instant(/* private fields */);

An Instant is a precise moment in time.

Internally this is stored as a Duration (which is 128 bits in size) offset from an opaque internally chosen epoch.

This represents the same thing that a DateTime does, but has advantages:

• It is easier to work with Durations by avoiding the complexity of the Calendar
• Spans a much larger time span, able to handle times from about 20 times as old as the age of the/ universe backwards, and the same distance forwards
• Provides attosecond (10^-18) precision.

Implementations

impl Instant

pub fn now() -> Result<Self, Error>

The current instant

Errors

If the system time is greater than i64::MAX seconds, we will get an Error::RangeError.

pub fn from_julian_day_f64(jd: f64) -> Self

Create from a Julian Day (low precision)

This is not as precise as from_julian_day_parts(), and much less precise than from_julian_day_precise()

pub fn from_julian_day_parts(day: i64, day_fraction: f64) -> Self

Create from a Julian Day (medium precision)

This is more precise than from_julian_day_f64() but not as precise as from_julian_day_precise()

pub fn from_julian_day_precise( day: i64, seconds: u32, attoseconds: i64, ) -> Result<Self, Error>

Create from a Julian Day (maximum precision)

This is more precise than from_julian_day_f64() but not as precise as from_julian_day_precise()

Errors

This will throw an Error::RangeError if the seconds are out of bounds (0 <= seconds < 86_400) or the attoseconds are out of bounds (0 <= attoseconds < ATTOS_PER_SEC_U64)

pub fn as_julian_day_f64(&self) -> f64

As Julian day (low precision)

pub fn as_julian_day_parts(&self) -> (i64, f64)

As Julian day (medium precision)

This returns a day number and a day fraction.

pub fn as_julian_day_precise(&self) -> (i64, i64, i64)

As Julian day (high precision)

This returns a day number, a second number, and an attoseconds number

pub fn as_julian_day_formatted(&self) -> String

As julian day (formatted as a string)

pub fn as_ntp_date(&self) -> (i64, i64)

As an NTP date, which is seconds and attoseconds.

This value is not returned as a Duration because NTP dates are incorrect durations from the NTP epoch (in that they don’t include leap seconds).

pub fn from_ntp_date(ntp_secs: i64, ntp_attos: i64) -> Self

From an NTP date

Trait Implementations

impl Add<Duration> for Instant

type Output = Instant

The resulting type after applying the + operator.

fn add(self, rhs: Duration) -> Self

Performs the + operation.

impl AddAssign<Duration> for Instant

fn add_assign(&mut self, rhs: Duration)

Performs the += operation.

impl Clone for Instant

fn clone(&self) -> Instant

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Instant

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

Formats the value using the given formatter.

impl<C: Calendar, S: Standard> From<DateTime<C, S>> for Instant

fn from(dt: DateTime<C, S>) -> Self

Converts to this type from the input type.

impl<C: Calendar, S: Standard> From<Instant> for DateTime<C, S>

fn from(i: Instant) -> Self

Converts to this type from the input type.

impl Hash for Instant

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

Feeds this value into the given Hasher.

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

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Instant

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

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

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

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Instant

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl PartialOrd for Instant

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Sub<Duration> for Instant

type Output = Instant

The resulting type after applying the - operator.

fn sub(self, rhs: Duration) -> Self

Performs the - operation.

impl Sub for Instant

type Output = Duration

The resulting type after applying the - operator.

fn sub(self, rhs: Self) -> Duration

Performs the - operation.

impl SubAssign<Duration> for Instant

fn sub_assign(&mut self, rhs: Duration)

Performs the -= operation.

impl TryFrom<SystemTime> for Instant

type Error = Error

The type returned in the event of a conversion error.

fn try_from(s: SystemTime) -> Result<Self, Self::Error>

Performs the conversion.

impl Copy for Instant

impl Eq for Instant

impl StructuralPartialEq for Instant