Computus

Computus Easter calculation in Rust

Usage

Add this to your Cargo.toml:

[dependencies]
computus = "1.1.0"

You can find when Easter Sunday is for a particular year with:

// For Gregorian calendars
let easter = computus::gregorian(2016).unwrap();
assert_eq!((easter.month, easter.day), (3, 27));
// For Julian calendars
let easter = computus::julian(2016).unwrap();
assert_eq!((easter.month, easter.day), (4, 18));
// With `chrono` feature
#[cfg(feature = "chrono")] {
    use chrono::Datelike;
    let easter = computus::gregorian_naive(2023).unwrap();
    assert_eq!((easter.month(), easter.day()), (4, 9));
}

lib.rs:

Overview

Calculate the date of Easter Sunday in Gregorian/Julian calendar using the computus method.

Features

Optional features:

• [chrono][]: Enable directly producing a chrono::NaiveDate

Example

You can find when Easter is for a particular year with:

// For Gregorian calendars
let easter = computus::gregorian(2016).unwrap();
assert_eq!((easter.month, easter.day), (3, 27));
// For Julian calendars
let easter = computus::julian(2016).unwrap();
assert_eq!((easter.month, easter.day), (4, 18));
// With `chrono` feature
#[cfg(feature = "chrono")] {
    use chrono::Datelike;
    let easter = computus::gregorian_naive(2023).unwrap();
    assert_eq!((easter.month(), easter.day()), (4, 9));
}