use std::time::{SystemTime,UNIX_EPOCH};
use chrono::{Duration,Datelike};

fn main() {

	// DIT

	let current_timestamp = SystemTime::now()
		.duration_since(UNIX_EPOCH)
		.unwrap()
		.as_secs_f64();

	let current_dit = (current_timestamp - 12.0*3600.0) % 86400.0 / 86400.0;

	let deca = (current_dit * 10.0 % 10.0) as u16;
	let decim = (current_dit * 1000.0 % 100.0) as u16;
	let desec = (current_dit * 100000.0 % 100.0) as u16;

	// StarDIT

	let date_opt = chrono::Utc::now().checked_add_signed(Duration::hours(-12));
	let date = match date_opt {
		Some(date) => date,
		None => panic!("Time overflow"),
	};

	let year = date.year() + 10000;
	let day = date.ordinal();

	let 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",
		_ => "?",
	};

	let weekade = day / 10;

	// Display
	println!("{}.{}.{}\n{}, décade {}, {}", deca, format!("{:0>2}", decim), format!("{:0>2}", desec), year, weekade, day_name);
}