Enum Weekday

pub enum Weekday {
    Mon = 0,
    Tue = 1,
    Wed = 2,
    Thu = 3,
    Fri = 4,
    Sat = 5,
    Sun = 6,
}

The day of week.

The order of the days of week depends on the context. (This is why this type does not implement PartialOrd or Ord traits.) One should prefer *_from_monday or *_from_sunday methods to get the correct result.

Example

use chrono::Weekday;

let monday = "Monday".parse::<Weekday>().unwrap();
assert_eq!(monday, Weekday::Mon);

let sunday = Weekday::try_from(6).unwrap();
assert_eq!(sunday, Weekday::Sun);

assert_eq!(sunday.num_days_from_monday(), 6); // starts counting with Monday = 0
assert_eq!(sunday.number_from_monday(), 7); // starts counting with Monday = 1
assert_eq!(sunday.num_days_from_sunday(), 0); // starts counting with Sunday = 0
assert_eq!(sunday.number_from_sunday(), 1); // starts counting with Sunday = 1

assert_eq!(sunday.succ(), monday);
assert_eq!(sunday.pred(), Weekday::Sat);

Variants

Mon = 0

Monday.

Tue = 1

Tuesday.

Wed = 2

Wednesday.

Thu = 3

Thursday.

Fri = 4

Friday.

Sat = 5

Saturday.

Sun = 6

Sunday.

Implementations

impl Weekday

pub const fn succ(&self) -> Weekday

The next day in the week.

w:	Mon	Tue	Wed	Thu	Fri	Sat	Sun
w.succ():	Tue	Wed	Thu	Fri	Sat	Sun	Mon

pub const fn pred(&self) -> Weekday

The previous day in the week.

w:	Mon	Tue	Wed	Thu	Fri	Sat	Sun
w.pred():	Sun	Mon	Tue	Wed	Thu	Fri	Sat

pub const fn number_from_monday(&self) -> u32

Returns a day-of-week number starting from Monday = 1. (ISO 8601 weekday number)

w:	Mon	Tue	Wed	Thu	Fri	Sat	Sun
w.number_from_monday():	1	2	3	4	5	6	7

pub const fn number_from_sunday(&self) -> u32

Returns a day-of-week number starting from Sunday = 1.

w:	Mon	Tue	Wed	Thu	Fri	Sat	Sun
w.number_from_sunday():	2	3	4	5	6	7	1

pub const fn num_days_from_monday(&self) -> u32

Returns a day-of-week number starting from Monday = 0.

w:	Mon	Tue	Wed	Thu	Fri	Sat	Sun
w.num_days_from_monday():	0	1	2	3	4	5	6

Example

// MTWRFSU is occasionally used as a single-letter abbreviation of the weekdays.
// Use `num_days_from_monday` to index into the array.
const MTWRFSU: [char; 7] = ['M', 'T', 'W', 'R', 'F', 'S', 'U'];

let today = Local::now().weekday();
println!("{}", MTWRFSU[today.num_days_from_monday() as usize]);

pub const fn num_days_from_sunday(&self) -> u32

Returns a day-of-week number starting from Sunday = 0.

w:	Mon	Tue	Wed	Thu	Fri	Sat	Sun
w.num_days_from_sunday():	1	2	3	4	5	6	0

pub const fn days_since(&self, other: Weekday) -> u32

The number of days since the given day.

Examples

use chrono::Weekday::*;
assert_eq!(Mon.days_since(Mon), 0);
assert_eq!(Sun.days_since(Tue), 5);
assert_eq!(Wed.days_since(Sun), 3);

Trait Implementations

impl Clone for Weekday

fn clone(&self) -> Weekday

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Weekday

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

Formats the value using the given formatter.

impl Display for Weekday

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

Formats the value using the given formatter.

impl FromPrimitive for Weekday

Any weekday can be represented as an integer from 0 to 6, which equals to Weekday::num_days_from_monday in this implementation. Do not heavily depend on this though; use explicit methods whenever possible.

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

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_u64(n: u64) -> Option<Weekday>

Converts an u64 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_u32(n: u32) -> Option<Self>

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_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 Weekday

Parsing a str into a Weekday uses the format %A.

Example

use chrono::Weekday;

assert_eq!("Sunday".parse::<Weekday>(), Ok(Weekday::Sun));
assert!("any day".parse::<Weekday>().is_err());

The parsing is case-insensitive.

assert_eq!("mON".parse::<Weekday>(), Ok(Weekday::Mon));

Only the shortest form (e.g. sun) and the longest form (e.g. sunday) is accepted.

assert!("thurs".parse::<Weekday>().is_err());

type Err = ParseWeekdayError

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 Weekday

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 PartialEq for Weekday

fn eq(&self, other: &Weekday) -> 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 TryFrom<u8> for Weekday

Any weekday can be represented as an integer from 0 to 6, which equals to Weekday::num_days_from_monday in this implementation. Do not heavily depend on this though; use explicit methods whenever possible.

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 Weekday

impl Eq for Weekday

impl StructuralPartialEq for Weekday