Enum Month

pub enum Month {
    January = 0,
    February = 1,
    March = 2,
    April = 3,
    May = 4,
    June = 5,
    July = 6,
    August = 7,
    September = 8,
    October = 9,
    November = 10,
    December = 11,
}

The month of the year.

This enum is just a convenience implementation. The month in dates created by DateLike objects does not return this enum.

It is possible to convert from a date to a month independently

use chrono::prelude::*;
let date = Utc.with_ymd_and_hms(2019, 10, 28, 9, 10, 11).unwrap();
// `2019-10-28T09:10:11Z`
let month = Month::try_from(u8::try_from(date.month()).unwrap()).ok();
assert_eq!(month, Some(Month::October))

Or from a Month to an integer usable by dates

let month = Month::January;
let dt = Utc.with_ymd_and_hms(2019, month.number_from_month(), 28, 9, 10, 11).unwrap();
assert_eq!((dt.year(), dt.month(), dt.day()), (2019, 1, 28));

Allows mapping from and to month, from 1-January to 12-December. Can be Serialized/Deserialized with serde

Variants

January = 0

January

February = 1

February

March = 2

March

April = 3

April

May = 4

May

June = 5

June

July = 6

July

August = 7

August

September = 8

September

October = 9

October

November = 10

November

December = 11

December

Implementations

impl Month

pub const fn succ(&self) -> Month

The next month.

m:	January	February	...	December
m.succ():	February	March	...	January

pub const fn pred(&self) -> Month

The previous month.

m:	January	February	...	December
m.pred():	December	January	...	November

pub const fn number_from_month(&self) -> u32

Returns a month-of-year number starting from January = 1.

m:	January	February	...	December
m.number_from_month():	1	2	...	12

pub const fn name(&self) -> &'static str

Get the name of the month

use chrono::Month;

assert_eq!(Month::January.name(), "January")

pub fn num_days(&self, year: i32) -> Option<u8>

Get the length in days of the month

Yields None if year is out of range for NaiveDate.

Trait Implementations

impl Clone for Month

fn clone(&self) -> Month

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Month

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Month

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl FromPrimitive for Month

fn from_u64(n: u64) -> Option<Month>

Returns an Option<Month> from a i64, assuming a 1-index, January = 1.

Month::from_i64(n: i64): | 1 | 2 | … | 12 —————————| –––––––––– | ——————— | … | —– ``: | Some(Month::January) | Some(Month::February) | … | Some(Month::December)

fn from_i64(n: i64) -> Option<Month>

Converts an i64 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_u32(n: u32) -> Option<Month>

Converts an u32 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_isize(n: isize) -> Option<Self>

Converts an isize to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_i8(n: i8) -> Option<Self>

Converts an i8 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_i16(n: i16) -> Option<Self>

Converts an i16 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_i32(n: i32) -> Option<Self>

Converts an i32 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_i128(n: i128) -> Option<Self>

Converts an i128 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_usize(n: usize) -> Option<Self>

Converts a usize to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_u8(n: u8) -> Option<Self>

Converts an u8 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_u16(n: u16) -> Option<Self>

Converts an u16 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_u128(n: u128) -> Option<Self>

Converts an u128 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_f32(n: f32) -> Option<Self>

Converts a f32 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

fn from_f64(n: f64) -> Option<Self>

Converts a f64 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

impl FromStr for Month

Parsing a str into a Month uses the format %B.

Example

use chrono::Month;

assert_eq!("January".parse::<Month>(), Ok(Month::January));
assert!("any day".parse::<Month>().is_err());

The parsing is case-insensitive.

assert_eq!("fEbruARy".parse::<Month>(), Ok(Month::February));

Only the shortest form (e.g. jan) and the longest form (e.g. january) is accepted.

assert!("septem".parse::<Month>().is_err());
assert!("Augustin".parse::<Month>().is_err());

type Err = ParseMonthError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for Month

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 Month

fn cmp(&self, other: &Month) -> 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 Month

fn eq(&self, other: &Month) -> 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 Month

fn partial_cmp(&self, other: &Month) -> 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 Serialize for Month

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl TryFrom<u8> for Month

type Error = OutOfRange

The type returned in the event of a conversion error.

fn try_from(value: u8) -> Result<Self, Self::Error>

Performs the conversion.

impl Copy for Month

impl Eq for Month

impl StructuralPartialEq for Month