Struct chrono::TimeDelta

pub struct TimeDelta {
    secs: i64,
    nanos: i32,
}

Time duration with nanosecond precision.

This also allows for negative durations; see individual methods for details.

A TimeDelta is represented internally as a complement of seconds and nanoseconds. The range is restricted to that of i64 milliseconds, with the minimum value notably being set to -i64::MAX rather than allowing the full range of i64::MIN. This is to allow easy flipping of sign, so that for instance abs() can be called without any checks.

Fields

secs: i64

nanos: i32

Implementations

impl TimeDelta

pub const fn new(secs: i64, nanos: u32) -> Option<TimeDelta>

Makes a new TimeDelta with given number of seconds and nanoseconds.

Errors

Returns None when the duration is out of bounds, or if nanos ≥ 1,000,000,000.

pub const fn weeks(weeks: i64) -> TimeDelta

Makes a new TimeDelta with the given number of weeks.

Equivalent to TimeDelta::seconds(weeks * 7 * 24 * 60 * 60) with overflow checks.

Panics

Panics when the duration is out of bounds.

pub const fn try_weeks(weeks: i64) -> Option<TimeDelta>

Makes a new TimeDelta with the given number of weeks.

Equivalent to TimeDelta::try_seconds(weeks * 7 * 24 * 60 * 60) with overflow checks.

Errors

Returns None when the TimeDelta would be out of bounds.

pub const fn days(days: i64) -> TimeDelta

Makes a new TimeDelta with the given number of days.

Equivalent to TimeDelta::seconds(days * 24 * 60 * 60) with overflow checks.

Panics

Panics when the TimeDelta would be out of bounds.

pub const fn try_days(days: i64) -> Option<TimeDelta>

Makes a new TimeDelta with the given number of days.

Equivalent to TimeDelta::try_seconds(days * 24 * 60 * 60) with overflow checks.

Errors

Returns None when the TimeDelta would be out of bounds.

pub const fn hours(hours: i64) -> TimeDelta

Makes a new TimeDelta with the given number of hours.

Equivalent to TimeDelta::seconds(hours * 60 * 60) with overflow checks.

Panics

Panics when the TimeDelta would be out of bounds.

pub const fn try_hours(hours: i64) -> Option<TimeDelta>

Makes a new TimeDelta with the given number of hours.

Equivalent to TimeDelta::try_seconds(hours * 60 * 60) with overflow checks.

Errors

Returns None when the TimeDelta would be out of bounds.

pub const fn minutes(minutes: i64) -> TimeDelta

Makes a new TimeDelta with the given number of minutes.

Equivalent to TimeDelta::seconds(minutes * 60) with overflow checks.

Panics

Panics when the TimeDelta would be out of bounds.

pub const fn try_minutes(minutes: i64) -> Option<TimeDelta>

Makes a new TimeDelta with the given number of minutes.

Equivalent to TimeDelta::try_seconds(minutes * 60) with overflow checks.

Errors

Returns None when the TimeDelta would be out of bounds.

pub const fn seconds(seconds: i64) -> TimeDelta

Makes a new TimeDelta with the given number of seconds.

Panics

Panics when seconds is more than i64::MAX / 1_000 or less than -i64::MAX / 1_000 (in this context, this is the same as i64::MIN / 1_000 due to rounding).

pub const fn try_seconds(seconds: i64) -> Option<TimeDelta>

Makes a new TimeDelta with the given number of seconds.

Errors

Returns None when seconds is more than i64::MAX / 1_000 or less than -i64::MAX / 1_000 (in this context, this is the same as i64::MIN / 1_000 due to rounding).

pub const fn milliseconds(milliseconds: i64) -> TimeDelta

Makes a new TimeDelta with the given number of milliseconds.

Panics

Panics when the TimeDelta would be out of bounds, i.e. when milliseconds is more than i64::MAX or less than -i64::MAX. Notably, this is not the same as i64::MIN.

pub const fn try_milliseconds(milliseconds: i64) -> Option<TimeDelta>

Makes a new TimeDelta with the given number of milliseconds.

Errors

Returns None the TimeDelta would be out of bounds, i.e. when milliseconds is more than i64::MAX or less than -i64::MAX. Notably, this is not the same as i64::MIN.

pub const fn microseconds(microseconds: i64) -> TimeDelta

Makes a new TimeDelta with the given number of microseconds.

The number of microseconds acceptable by this constructor is less than the total number that can actually be stored in a TimeDelta, so it is not possible to specify a value that would be out of bounds. This function is therefore infallible.

pub const fn nanoseconds(nanos: i64) -> TimeDelta

Makes a new TimeDelta with the given number of nanoseconds.

The number of nanoseconds acceptable by this constructor is less than the total number that can actually be stored in a TimeDelta, so it is not possible to specify a value that would be out of bounds. This function is therefore infallible.

pub const fn num_weeks(&self) -> i64

Returns the total number of whole weeks in the TimeDelta.

pub const fn num_days(&self) -> i64

Returns the total number of whole days in the TimeDelta.

pub const fn num_hours(&self) -> i64

Returns the total number of whole hours in the TimeDelta.

pub const fn num_minutes(&self) -> i64

Returns the total number of whole minutes in the TimeDelta.

pub const fn num_seconds(&self) -> i64

Returns the total number of whole seconds in the TimeDelta.

pub const fn subsec_nanos(&self) -> i32

Returns the number of nanoseconds such that subsec_nanos() + num_seconds() * NANOS_PER_SEC is the total number of nanoseconds in the TimeDelta.

pub const fn num_milliseconds(&self) -> i64

Returns the total number of whole milliseconds in the TimeDelta.

pub const fn num_microseconds(&self) -> Option<i64>

Returns the total number of whole microseconds in the TimeDelta, or None on overflow (exceeding 2^63 microseconds in either direction).

pub const fn num_nanoseconds(&self) -> Option<i64>

Returns the total number of whole nanoseconds in the TimeDelta, or None on overflow (exceeding 2^63 nanoseconds in either direction).

pub const fn checked_add(&self, rhs: &TimeDelta) -> Option<TimeDelta>

Add two TimeDeltas, returning None if overflow occurred.

pub const fn checked_sub(&self, rhs: &TimeDelta) -> Option<TimeDelta>

Subtract two TimeDeltas, returning None if overflow occurred.

pub const fn checked_mul(&self, rhs: i32) -> Option<TimeDelta>

Multiply a TimeDelta with a i32, returning None if overflow occurred.

pub const fn checked_div(&self, rhs: i32) -> Option<TimeDelta>

Divide a TimeDelta with a i32, returning None if dividing by 0.

pub const fn abs(&self) -> TimeDelta

Returns the TimeDelta as an absolute (non-negative) value.

pub const fn min_value() -> TimeDelta

The minimum possible TimeDelta: -i64::MAX milliseconds.

pub const fn max_value() -> TimeDelta

The maximum possible TimeDelta: i64::MAX milliseconds.

pub const fn zero() -> TimeDelta

A TimeDelta where the stored seconds and nanoseconds are equal to zero.

pub const fn is_zero(&self) -> bool

Returns true if the TimeDelta equals TimeDelta::zero().

pub const fn from_std(duration: Duration) -> Result<TimeDelta, OutOfRangeError>

Creates a TimeDelta object from std::time::Duration

This function errors when original duration is larger than the maximum value supported for this type.

pub const fn to_std(&self) -> Result<Duration, OutOfRangeError>

Creates a std::time::Duration object from a TimeDelta.

This function errors when duration is less than zero. As standard library implementation is limited to non-negative values.

pub(crate) const fn neg(self) -> TimeDelta

This duplicates Neg::neg because trait methods can’t be const yet.

Trait Implementations

impl<Tz: TimeZone> Add<TimeDelta> for Date<Tz>

type Output = Date<Tz>

The resulting type after applying the + operator.

fn add(self, rhs: TimeDelta) -> Date<Tz>

Performs the + operation.

impl<Tz: TimeZone> Add<TimeDelta> for DateTime<Tz>

Add TimeDelta to DateTime.

As a part of Chrono’s [leap second handling], the addition assumes that there is no leap second ever, except when the NaiveDateTime itself represents a leap second in which case the assumption becomes that there is exactly a single leap second ever.

Panics

Panics if the resulting date would be out of range. Consider using DateTime<Tz>::checked_add_signed to get an Option instead.

type Output = DateTime<Tz>

The resulting type after applying the + operator.

fn add(self, rhs: TimeDelta) -> DateTime<Tz>

Performs the + operation.

impl Add<TimeDelta> for NaiveDate

Add TimeDelta to NaiveDate.

This discards the fractional days in TimeDelta, rounding to the closest integral number of days towards TimeDelta::zero().

Panics

Panics if the resulting date would be out of range. Consider using NaiveDate::checked_add_signed to get an Option instead.

Example

use chrono::{NaiveDate, TimeDelta};

let from_ymd = |y, m, d| NaiveDate::from_ymd_opt(y, m, d).unwrap();

assert_eq!(from_ymd(2014, 1, 1) + TimeDelta::zero(), from_ymd(2014, 1, 1));
assert_eq!(from_ymd(2014, 1, 1) + TimeDelta::try_seconds(86399).unwrap(), from_ymd(2014, 1, 1));
assert_eq!(
    from_ymd(2014, 1, 1) + TimeDelta::try_seconds(-86399).unwrap(),
    from_ymd(2014, 1, 1)
);
assert_eq!(from_ymd(2014, 1, 1) + TimeDelta::try_days(1).unwrap(), from_ymd(2014, 1, 2));
assert_eq!(from_ymd(2014, 1, 1) + TimeDelta::try_days(-1).unwrap(), from_ymd(2013, 12, 31));
assert_eq!(from_ymd(2014, 1, 1) + TimeDelta::try_days(364).unwrap(), from_ymd(2014, 12, 31));
assert_eq!(
    from_ymd(2014, 1, 1) + TimeDelta::try_days(365 * 4 + 1).unwrap(),
    from_ymd(2018, 1, 1)
);
assert_eq!(
    from_ymd(2014, 1, 1) + TimeDelta::try_days(365 * 400 + 97).unwrap(),
    from_ymd(2414, 1, 1)
);

type Output = NaiveDate

The resulting type after applying the + operator.

fn add(self, rhs: TimeDelta) -> NaiveDate

Performs the + operation.

impl Add<TimeDelta> for NaiveDateTime

Add TimeDelta to NaiveDateTime.

As a part of Chrono’s leap second handling, the addition assumes that there is no leap second ever, except when the NaiveDateTime itself represents a leap second in which case the assumption becomes that there is exactly a single leap second ever.

Panics

Panics if the resulting date would be out of range. Consider using NaiveDateTime::checked_add_signed to get an Option instead.

Example

use chrono::{NaiveDate, TimeDelta};

let from_ymd = |y, m, d| NaiveDate::from_ymd_opt(y, m, d).unwrap();

let d = from_ymd(2016, 7, 8);
let hms = |h, m, s| d.and_hms_opt(h, m, s).unwrap();
assert_eq!(hms(3, 5, 7) + TimeDelta::zero(), hms(3, 5, 7));
assert_eq!(hms(3, 5, 7) + TimeDelta::try_seconds(1).unwrap(), hms(3, 5, 8));
assert_eq!(hms(3, 5, 7) + TimeDelta::try_seconds(-1).unwrap(), hms(3, 5, 6));
assert_eq!(hms(3, 5, 7) + TimeDelta::try_seconds(3600 + 60).unwrap(), hms(4, 6, 7));
assert_eq!(
    hms(3, 5, 7) + TimeDelta::try_seconds(86_400).unwrap(),
    from_ymd(2016, 7, 9).and_hms_opt(3, 5, 7).unwrap()
);
assert_eq!(
    hms(3, 5, 7) + TimeDelta::try_days(365).unwrap(),
    from_ymd(2017, 7, 8).and_hms_opt(3, 5, 7).unwrap()
);

let hmsm = |h, m, s, milli| d.and_hms_milli_opt(h, m, s, milli).unwrap();
assert_eq!(hmsm(3, 5, 7, 980) + TimeDelta::try_milliseconds(450).unwrap(), hmsm(3, 5, 8, 430));

Leap seconds are handled, but the addition assumes that it is the only leap second happened.

let leap = hmsm(3, 5, 59, 1_300);
assert_eq!(leap + TimeDelta::zero(), hmsm(3, 5, 59, 1_300));
assert_eq!(leap + TimeDelta::try_milliseconds(-500).unwrap(), hmsm(3, 5, 59, 800));
assert_eq!(leap + TimeDelta::try_milliseconds(500).unwrap(), hmsm(3, 5, 59, 1_800));
assert_eq!(leap + TimeDelta::try_milliseconds(800).unwrap(), hmsm(3, 6, 0, 100));
assert_eq!(leap + TimeDelta::try_seconds(10).unwrap(), hmsm(3, 6, 9, 300));
assert_eq!(leap + TimeDelta::try_seconds(-10).unwrap(), hmsm(3, 5, 50, 300));
assert_eq!(leap + TimeDelta::try_days(1).unwrap(),
           from_ymd(2016, 7, 9).and_hms_milli_opt(3, 5, 59, 300).unwrap());

type Output = NaiveDateTime

The resulting type after applying the + operator.

fn add(self, rhs: TimeDelta) -> NaiveDateTime

Performs the + operation.

impl Add<TimeDelta> for NaiveTime

Add TimeDelta to NaiveTime.

This wraps around and never overflows or underflows. In particular the addition ignores integral number of days.

As a part of Chrono’s leap second handling, the addition assumes that there is no leap second ever, except when the NaiveTime itself represents a leap second in which case the assumption becomes that there is exactly a single leap second ever.

Example

use chrono::{NaiveTime, TimeDelta};

let from_hmsm = |h, m, s, milli| NaiveTime::from_hms_milli_opt(h, m, s, milli).unwrap();

assert_eq!(from_hmsm(3, 5, 7, 0) + TimeDelta::zero(), from_hmsm(3, 5, 7, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) + TimeDelta::try_seconds(1).unwrap(), from_hmsm(3, 5, 8, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) + TimeDelta::try_seconds(-1).unwrap(), from_hmsm(3, 5, 6, 0));
assert_eq!(
    from_hmsm(3, 5, 7, 0) + TimeDelta::try_seconds(60 + 4).unwrap(),
    from_hmsm(3, 6, 11, 0)
);
assert_eq!(
    from_hmsm(3, 5, 7, 0) + TimeDelta::try_seconds(7 * 60 * 60 - 6 * 60).unwrap(),
    from_hmsm(9, 59, 7, 0)
);
assert_eq!(
    from_hmsm(3, 5, 7, 0) + TimeDelta::try_milliseconds(80).unwrap(),
    from_hmsm(3, 5, 7, 80)
);
assert_eq!(
    from_hmsm(3, 5, 7, 950) + TimeDelta::try_milliseconds(280).unwrap(),
    from_hmsm(3, 5, 8, 230)
);
assert_eq!(
    from_hmsm(3, 5, 7, 950) + TimeDelta::try_milliseconds(-980).unwrap(),
    from_hmsm(3, 5, 6, 970)
);

The addition wraps around.

assert_eq!(from_hmsm(3, 5, 7, 0) + TimeDelta::try_seconds(22*60*60).unwrap(), from_hmsm(1, 5, 7, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) + TimeDelta::try_seconds(-8*60*60).unwrap(), from_hmsm(19, 5, 7, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) + TimeDelta::try_days(800).unwrap(), from_hmsm(3, 5, 7, 0));

Leap seconds are handled, but the addition assumes that it is the only leap second happened.

let leap = from_hmsm(3, 5, 59, 1_300);
assert_eq!(leap + TimeDelta::zero(), from_hmsm(3, 5, 59, 1_300));
assert_eq!(leap + TimeDelta::try_milliseconds(-500).unwrap(), from_hmsm(3, 5, 59, 800));
assert_eq!(leap + TimeDelta::try_milliseconds(500).unwrap(), from_hmsm(3, 5, 59, 1_800));
assert_eq!(leap + TimeDelta::try_milliseconds(800).unwrap(), from_hmsm(3, 6, 0, 100));
assert_eq!(leap + TimeDelta::try_seconds(10).unwrap(), from_hmsm(3, 6, 9, 300));
assert_eq!(leap + TimeDelta::try_seconds(-10).unwrap(), from_hmsm(3, 5, 50, 300));
assert_eq!(leap + TimeDelta::try_days(1).unwrap(), from_hmsm(3, 5, 59, 300));

type Output = NaiveTime

The resulting type after applying the + operator.

fn add(self, rhs: TimeDelta) -> NaiveTime

Performs the + operation.

impl Add for TimeDelta

type Output = TimeDelta

The resulting type after applying the + operator.

fn add(self, rhs: TimeDelta) -> TimeDelta

Performs the + operation.

impl<Tz: TimeZone> AddAssign<TimeDelta> for Date<Tz>

fn add_assign(&mut self, rhs: TimeDelta)

Performs the += operation.

impl<Tz: TimeZone> AddAssign<TimeDelta> for DateTime<Tz>

Add-assign chrono::Duration to DateTime.

As a part of Chrono’s [leap second handling], the addition assumes that there is no leap second ever, except when the NaiveDateTime itself represents a leap second in which case the assumption becomes that there is exactly a single leap second ever.

Panics

Panics if the resulting date would be out of range. Consider using DateTime<Tz>::checked_add_signed to get an Option instead.

fn add_assign(&mut self, rhs: TimeDelta)

Performs the += operation.

impl AddAssign<TimeDelta> for NaiveDate

Add-assign of TimeDelta to NaiveDate.

This discards the fractional days in TimeDelta, rounding to the closest integral number of days towards TimeDelta::zero().

Panics

Panics if the resulting date would be out of range. Consider using NaiveDate::checked_add_signed to get an Option instead.

fn add_assign(&mut self, rhs: TimeDelta)

Performs the += operation.

impl AddAssign<TimeDelta> for NaiveDateTime

Add-assign TimeDelta to NaiveDateTime.

As a part of Chrono’s [leap second handling], the addition assumes that there is no leap second ever, except when the NaiveDateTime itself represents a leap second in which case the assumption becomes that there is exactly a single leap second ever.

Panics

Panics if the resulting date would be out of range. Consider using NaiveDateTime::checked_add_signed to get an Option instead.

fn add_assign(&mut self, rhs: TimeDelta)

Performs the += operation.

impl AddAssign<TimeDelta> for NaiveTime

Add-assign TimeDelta to NaiveTime.

This wraps around and never overflows or underflows. In particular the addition ignores integral number of days.

fn add_assign(&mut self, rhs: TimeDelta)

Performs the += operation.

impl AddAssign for TimeDelta

fn add_assign(&mut self, rhs: TimeDelta)

Performs the += operation.

impl Clone for TimeDelta

fn clone(&self) -> TimeDelta

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for TimeDelta

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

Formats the value using the given formatter.

impl Default for TimeDelta

fn default() -> TimeDelta

Returns the “default value” for a type.

impl Display for TimeDelta

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

Format a TimeDelta using the ISO 8601 format

impl Div<i32> for TimeDelta

type Output = TimeDelta

The resulting type after applying the / operator.

fn div(self, rhs: i32) -> TimeDelta

Performs the / operation.

impl Hash for TimeDelta

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 Mul<i32> for TimeDelta

type Output = TimeDelta

The resulting type after applying the * operator.

fn mul(self, rhs: i32) -> TimeDelta

Performs the * operation.

impl Neg for TimeDelta

type Output = TimeDelta

The resulting type after applying the - operator.

fn neg(self) -> TimeDelta

Performs the unary - operation.

impl Ord for TimeDelta

fn cmp(&self, other: &TimeDelta) -> 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 + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for TimeDelta

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

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

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

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

impl PartialOrd for TimeDelta

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

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

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

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

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

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

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

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

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

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

impl<Tz: TimeZone> Sub<TimeDelta> for Date<Tz>

type Output = Date<Tz>

The resulting type after applying the - operator.

fn sub(self, rhs: TimeDelta) -> Date<Tz>

Performs the - operation.

impl<Tz: TimeZone> Sub<TimeDelta> for DateTime<Tz>

Subtract TimeDelta from DateTime.

This is the same as the addition with a negated TimeDelta.

As a part of Chrono’s [leap second handling] the subtraction assumes that there is no leap second ever, except when the DateTime itself represents a leap second in which case the assumption becomes that there is exactly a single leap second ever.

Panics

Panics if the resulting date would be out of range. Consider using DateTime<Tz>::checked_sub_signed to get an Option instead.

type Output = DateTime<Tz>

The resulting type after applying the - operator.

fn sub(self, rhs: TimeDelta) -> DateTime<Tz>

Performs the - operation.

impl Sub<TimeDelta> for NaiveDate

Subtract TimeDelta from NaiveDate.

This discards the fractional days in TimeDelta, rounding to the closest integral number of days towards TimeDelta::zero(). It is the same as the addition with a negated TimeDelta.

Panics

Panics if the resulting date would be out of range. Consider using NaiveDate::checked_sub_signed to get an Option instead.

Example

use chrono::{NaiveDate, TimeDelta};

let from_ymd = |y, m, d| NaiveDate::from_ymd_opt(y, m, d).unwrap();

assert_eq!(from_ymd(2014, 1, 1) - TimeDelta::zero(), from_ymd(2014, 1, 1));
assert_eq!(from_ymd(2014, 1, 1) - TimeDelta::try_seconds(86399).unwrap(), from_ymd(2014, 1, 1));
assert_eq!(
    from_ymd(2014, 1, 1) - TimeDelta::try_seconds(-86399).unwrap(),
    from_ymd(2014, 1, 1)
);
assert_eq!(from_ymd(2014, 1, 1) - TimeDelta::try_days(1).unwrap(), from_ymd(2013, 12, 31));
assert_eq!(from_ymd(2014, 1, 1) - TimeDelta::try_days(-1).unwrap(), from_ymd(2014, 1, 2));
assert_eq!(from_ymd(2014, 1, 1) - TimeDelta::try_days(364).unwrap(), from_ymd(2013, 1, 2));
assert_eq!(
    from_ymd(2014, 1, 1) - TimeDelta::try_days(365 * 4 + 1).unwrap(),
    from_ymd(2010, 1, 1)
);
assert_eq!(
    from_ymd(2014, 1, 1) - TimeDelta::try_days(365 * 400 + 97).unwrap(),
    from_ymd(1614, 1, 1)
);

type Output = NaiveDate

The resulting type after applying the - operator.

fn sub(self, rhs: TimeDelta) -> NaiveDate

Performs the - operation.

impl Sub<TimeDelta> for NaiveDateTime

Subtract TimeDelta from NaiveDateTime.

This is the same as the addition with a negated TimeDelta.

As a part of Chrono’s leap second handling the subtraction assumes that there is no leap second ever, except when the NaiveDateTime itself represents a leap second in which case the assumption becomes that there is exactly a single leap second ever.

Panics

Panics if the resulting date would be out of range. Consider using NaiveDateTime::checked_sub_signed to get an Option instead.

Example

use chrono::{NaiveDate, TimeDelta};

let from_ymd = |y, m, d| NaiveDate::from_ymd_opt(y, m, d).unwrap();

let d = from_ymd(2016, 7, 8);
let hms = |h, m, s| d.and_hms_opt(h, m, s).unwrap();
assert_eq!(hms(3, 5, 7) - TimeDelta::zero(), hms(3, 5, 7));
assert_eq!(hms(3, 5, 7) - TimeDelta::try_seconds(1).unwrap(), hms(3, 5, 6));
assert_eq!(hms(3, 5, 7) - TimeDelta::try_seconds(-1).unwrap(), hms(3, 5, 8));
assert_eq!(hms(3, 5, 7) - TimeDelta::try_seconds(3600 + 60).unwrap(), hms(2, 4, 7));
assert_eq!(
    hms(3, 5, 7) - TimeDelta::try_seconds(86_400).unwrap(),
    from_ymd(2016, 7, 7).and_hms_opt(3, 5, 7).unwrap()
);
assert_eq!(
    hms(3, 5, 7) - TimeDelta::try_days(365).unwrap(),
    from_ymd(2015, 7, 9).and_hms_opt(3, 5, 7).unwrap()
);

let hmsm = |h, m, s, milli| d.and_hms_milli_opt(h, m, s, milli).unwrap();
assert_eq!(hmsm(3, 5, 7, 450) - TimeDelta::try_milliseconds(670).unwrap(), hmsm(3, 5, 6, 780));

Leap seconds are handled, but the subtraction assumes that it is the only leap second happened.

let leap = hmsm(3, 5, 59, 1_300);
assert_eq!(leap - TimeDelta::zero(), hmsm(3, 5, 59, 1_300));
assert_eq!(leap - TimeDelta::try_milliseconds(200).unwrap(), hmsm(3, 5, 59, 1_100));
assert_eq!(leap - TimeDelta::try_milliseconds(500).unwrap(), hmsm(3, 5, 59, 800));
assert_eq!(leap - TimeDelta::try_seconds(60).unwrap(), hmsm(3, 5, 0, 300));
assert_eq!(leap - TimeDelta::try_days(1).unwrap(),
           from_ymd(2016, 7, 7).and_hms_milli_opt(3, 6, 0, 300).unwrap());

type Output = NaiveDateTime

The resulting type after applying the - operator.

fn sub(self, rhs: TimeDelta) -> NaiveDateTime

Performs the - operation.

impl Sub<TimeDelta> for NaiveTime

Subtract TimeDelta from NaiveTime.

This wraps around and never overflows or underflows. In particular the subtraction ignores integral number of days. This is the same as addition with a negated TimeDelta.

As a part of Chrono’s leap second handling, the subtraction assumes that there is no leap second ever, except when the NaiveTime itself represents a leap second in which case the assumption becomes that there is exactly a single leap second ever.

Example

use chrono::{NaiveTime, TimeDelta};

let from_hmsm = |h, m, s, milli| NaiveTime::from_hms_milli_opt(h, m, s, milli).unwrap();

assert_eq!(from_hmsm(3, 5, 7, 0) - TimeDelta::zero(), from_hmsm(3, 5, 7, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) - TimeDelta::try_seconds(1).unwrap(), from_hmsm(3, 5, 6, 0));
assert_eq!(
    from_hmsm(3, 5, 7, 0) - TimeDelta::try_seconds(60 + 5).unwrap(),
    from_hmsm(3, 4, 2, 0)
);
assert_eq!(
    from_hmsm(3, 5, 7, 0) - TimeDelta::try_seconds(2 * 60 * 60 + 6 * 60).unwrap(),
    from_hmsm(0, 59, 7, 0)
);
assert_eq!(
    from_hmsm(3, 5, 7, 0) - TimeDelta::try_milliseconds(80).unwrap(),
    from_hmsm(3, 5, 6, 920)
);
assert_eq!(
    from_hmsm(3, 5, 7, 950) - TimeDelta::try_milliseconds(280).unwrap(),
    from_hmsm(3, 5, 7, 670)
);

The subtraction wraps around.

assert_eq!(from_hmsm(3, 5, 7, 0) - TimeDelta::try_seconds(8*60*60).unwrap(), from_hmsm(19, 5, 7, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) - TimeDelta::try_days(800).unwrap(), from_hmsm(3, 5, 7, 0));

Leap seconds are handled, but the subtraction assumes that it is the only leap second happened.

let leap = from_hmsm(3, 5, 59, 1_300);
assert_eq!(leap - TimeDelta::zero(), from_hmsm(3, 5, 59, 1_300));
assert_eq!(leap - TimeDelta::try_milliseconds(200).unwrap(), from_hmsm(3, 5, 59, 1_100));
assert_eq!(leap - TimeDelta::try_milliseconds(500).unwrap(), from_hmsm(3, 5, 59, 800));
assert_eq!(leap - TimeDelta::try_seconds(60).unwrap(), from_hmsm(3, 5, 0, 300));
assert_eq!(leap - TimeDelta::try_days(1).unwrap(), from_hmsm(3, 6, 0, 300));

type Output = NaiveTime

The resulting type after applying the - operator.

fn sub(self, rhs: TimeDelta) -> NaiveTime

Performs the - operation.

impl Sub for TimeDelta

type Output = TimeDelta

The resulting type after applying the - operator.

fn sub(self, rhs: TimeDelta) -> TimeDelta

Performs the - operation.

impl<Tz: TimeZone> SubAssign<TimeDelta> for Date<Tz>

fn sub_assign(&mut self, rhs: TimeDelta)

Performs the -= operation.

impl<Tz: TimeZone> SubAssign<TimeDelta> for DateTime<Tz>

Subtract-assign TimeDelta from DateTime.

This is the same as the addition with a negated TimeDelta.

As a part of Chrono’s [leap second handling], the addition assumes that there is no leap second ever, except when the DateTime itself represents a leap second in which case the assumption becomes that there is exactly a single leap second ever.

Panics

Panics if the resulting date would be out of range. Consider using DateTime<Tz>::checked_sub_signed to get an Option instead.

fn sub_assign(&mut self, rhs: TimeDelta)

Performs the -= operation.

impl SubAssign<TimeDelta> for NaiveDate

Subtract-assign TimeDelta from NaiveDate.

This discards the fractional days in TimeDelta, rounding to the closest integral number of days towards TimeDelta::zero(). It is the same as the addition with a negated TimeDelta.

Panics

Panics if the resulting date would be out of range. Consider using NaiveDate::checked_sub_signed to get an Option instead.

fn sub_assign(&mut self, rhs: TimeDelta)

Performs the -= operation.

impl SubAssign<TimeDelta> for NaiveDateTime

Subtract-assign TimeDelta from NaiveDateTime.

This is the same as the addition with a negated TimeDelta.

As a part of Chrono’s [leap second handling], the addition assumes that there is no leap second ever, except when the NaiveDateTime itself represents a leap second in which case the assumption becomes that there is exactly a single leap second ever.

Panics

Panics if the resulting date would be out of range. Consider using NaiveDateTime::checked_sub_signed to get an Option instead.

fn sub_assign(&mut self, rhs: TimeDelta)

Performs the -= operation.

impl SubAssign<TimeDelta> for NaiveTime

Subtract-assign TimeDelta from NaiveTime.

This wraps around and never overflows or underflows. In particular the subtraction ignores integral number of days.

fn sub_assign(&mut self, rhs: TimeDelta)

Performs the -= operation.

impl SubAssign for TimeDelta

fn sub_assign(&mut self, rhs: TimeDelta)

Performs the -= operation.

impl<'a> Sum<&'a TimeDelta> for TimeDelta

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

Method which takes an iterator and generates Self from the elements by “summing up” the items.

impl Sum for TimeDelta

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

Method which takes an iterator and generates Self from the elements by “summing up” the items.

impl Copy for TimeDelta

impl Eq for TimeDelta

impl StructuralPartialEq for TimeDelta