Struct chrono::Months

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pub struct Months(/* private fields */);
Expand description

A duration in calendar months

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impl Months

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pub const fn new(num: u32) -> Self

Construct a new Months from a number of months

Trait Implementations§

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

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type Output = DateTime<Tz>

The resulting type after applying the + operator.
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fn add(self, rhs: Months) -> Self::Output

Performs the + operation. Read more
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impl Add<Months> for NaiveDate

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fn add(self, months: Months) -> Self::Output

An addition of months to NaiveDate clamped to valid days in resulting month.

§Panics

Panics if the resulting date would be out of range.

§Example
use chrono::{Duration, NaiveDate, Months};

let from_ymd = NaiveDate::from_ymd;

assert_eq!(from_ymd(2014, 1, 1) + Months::new(1), from_ymd(2014, 2, 1));
assert_eq!(from_ymd(2014, 1, 1) + Months::new(11), from_ymd(2014, 12, 1));
assert_eq!(from_ymd(2014, 1, 1) + Months::new(12), from_ymd(2015, 1, 1));
assert_eq!(from_ymd(2014, 1, 1) + Months::new(13), from_ymd(2015, 2, 1));
assert_eq!(from_ymd(2014, 1, 31) + Months::new(1), from_ymd(2014, 2, 28));
assert_eq!(from_ymd(2020, 1, 31) + Months::new(1), from_ymd(2020, 2, 29));
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type Output = NaiveDate

The resulting type after applying the + operator.
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impl Add<Months> for NaiveDateTime

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fn add(self, rhs: Months) -> Self::Output

An addition of months to NaiveDateTime clamped to valid days in resulting month.

§Panics

Panics if the resulting date would be out of range.

§Example
use chrono::{Duration, NaiveDateTime, Months, NaiveDate};
use std::str::FromStr;

assert_eq!(
    NaiveDate::from_ymd_opt(2014, 1, 1).unwrap().and_hms_opt(1, 0, 0).unwrap() + Months::new(1),
    NaiveDate::from_ymd_opt(2014, 2, 1).unwrap().and_hms_opt(1, 0, 0).unwrap()
);
assert_eq!(
    NaiveDate::from_ymd_opt(2014, 1, 1).unwrap().and_hms_opt(0, 2, 0).unwrap() + Months::new(11),
    NaiveDate::from_ymd_opt(2014, 12, 1).unwrap().and_hms_opt(0, 2, 0).unwrap()
);
assert_eq!(
    NaiveDate::from_ymd_opt(2014, 1, 1).unwrap().and_hms_opt(0, 0, 3).unwrap() + Months::new(12),
    NaiveDate::from_ymd_opt(2015, 1, 1).unwrap().and_hms_opt(0, 0, 3).unwrap()
);
assert_eq!(
    NaiveDate::from_ymd_opt(2014, 1, 1).unwrap().and_hms_opt(0, 0, 4).unwrap() + Months::new(13),
    NaiveDate::from_ymd_opt(2015, 2, 1).unwrap().and_hms_opt(0, 0, 4).unwrap()
);
assert_eq!(
    NaiveDate::from_ymd_opt(2014, 1, 31).unwrap().and_hms_opt(0, 5, 0).unwrap() + Months::new(1),
    NaiveDate::from_ymd_opt(2014, 2, 28).unwrap().and_hms_opt(0, 5, 0).unwrap()
);
assert_eq!(
    NaiveDate::from_ymd_opt(2020, 1, 31).unwrap().and_hms_opt(6, 0, 0).unwrap() + Months::new(1),
    NaiveDate::from_ymd_opt(2020, 2, 29).unwrap().and_hms_opt(6, 0, 0).unwrap()
);
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type Output = NaiveDateTime

The resulting type after applying the + operator.
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impl Clone for Months

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fn clone(&self) -> Months

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Months

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

Formats the value using the given formatter. Read more
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impl Hash for Months

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

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for Months

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

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

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

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl<Tz: TimeZone> Sub<Months> for DateTime<Tz>

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type Output = DateTime<Tz>

The resulting type after applying the - operator.
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fn sub(self, rhs: Months) -> Self::Output

Performs the - operation. Read more
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impl Sub<Months> for NaiveDate

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fn sub(self, months: Months) -> Self::Output

A subtraction of Months from NaiveDate clamped to valid days in resulting month.

§Panics

Panics if the resulting date would be out of range.

§Example
use chrono::{Duration, NaiveDate, Months};

let from_ymd = NaiveDate::from_ymd;

assert_eq!(from_ymd(2014, 1, 1) - Months::new(11), from_ymd(2013, 2, 1));
assert_eq!(from_ymd(2014, 1, 1) - Months::new(12), from_ymd(2013, 1, 1));
assert_eq!(from_ymd(2014, 1, 1) - Months::new(13), from_ymd(2012, 12, 1));
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type Output = NaiveDate

The resulting type after applying the - operator.
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impl Sub<Months> for NaiveDateTime

A subtraction of Months from NaiveDateTime clamped to valid days in resulting month.

§Panics

Panics if the resulting date would be out of range.

§Example

use chrono::{Duration, NaiveDateTime, Months, NaiveDate};
use std::str::FromStr;

assert_eq!(
    NaiveDate::from_ymd_opt(2014, 01, 01).unwrap().and_hms_opt(01, 00, 00).unwrap() - Months::new(11),
    NaiveDate::from_ymd_opt(2013, 02, 01).unwrap().and_hms_opt(01, 00, 00).unwrap()
);
assert_eq!(
    NaiveDate::from_ymd_opt(2014, 01, 01).unwrap().and_hms_opt(00, 02, 00).unwrap() - Months::new(12),
    NaiveDate::from_ymd_opt(2013, 01, 01).unwrap().and_hms_opt(00, 02, 00).unwrap()
);
assert_eq!(
    NaiveDate::from_ymd_opt(2014, 01, 01).unwrap().and_hms_opt(00, 00, 03).unwrap() - Months::new(13),
    NaiveDate::from_ymd_opt(2012, 12, 01).unwrap().and_hms_opt(00, 00, 03).unwrap()
);
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type Output = NaiveDateTime

The resulting type after applying the - operator.
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fn sub(self, rhs: Months) -> Self::Output

Performs the - operation. Read more
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impl Copy for Months

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impl Eq for Months

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impl StructuralPartialEq for Months

Auto Trait Implementations§

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impl Freeze for Months

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impl RefUnwindSafe for Months

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impl Send for Months

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impl Sync for Months

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impl Unpin for Months

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impl UnwindSafe for Months

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. 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.

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

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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> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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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.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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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.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.