dit-rs/libstardit/src/lib.rs

extern crate chrono;

pub mod libstardit {
	use chrono::{Datelike, LocalResult, TimeZone};

	pub struct StarDIT {
		pub year: u16,
		pub weekade: u16,
		pub day_name: String,
		pub day: u16,
	}

	pub fn unix_to_stardit(unix: f64) -> StarDIT {
		let date = match chrono::Utc.timestamp_millis_opt(((unix as i64) - 12 * 3600) * 1000) {
			LocalResult::Single(date) => date,
			_ => panic!("Incorrect timestamp_millis"),
		};
		let day = date.ordinal() as u16;
		StarDIT {
			year: (date.year() + 10000) as u16,
			weekade: day / 10,
			day_name: match day % 10 {
				0 => "zéridi",
				1 => "unidi",
				2 => "duodi",
				3 => "tridi",
				4 => "quartidi",
				5 => "quintidi",
				6 => "sextidi",
				7 => "septidi",
				8 => "octidi",
				9 => "nonidi",
				_ => "?",
			}
			.to_string(),
			day,
		}
	}
}