r/Dailyprogrammer Challenge #201 Easy - Rust Date Math

rdp_201_easy.rs

///////////////////////////////////////////////////
// r/Dailyprogrammer #201 Easy                   //
//    coded by Michael Repper                    //
//    query [a * t] gridoodle [ d * o * t ] com  //
///////////////////////////////////////////////////

extern crate time;
use std::num::SignedInt;

////
// Takes 2 dates and returns the difference in days.
// Dates should be passed as arrays in the form:
// [mm, dd, YYYY]
////

fn days_diff(date_1:&[int, ..3], date_2:&[int, ..3] )
{
    let proc_1 = 365 * date_1[2] + date_1[2] / 4 - date_1[2] / 100 + date_1[2] / 400 + date_1[1] + (153 * date_1[0] + 8) / 5;
    let proc_2 = 365 * date_2[2] + date_2[2] / 4 - date_2[2] / 100 + date_2[2] / 400 + date_2[1] + (153 * date_2[0] + 8) / 5;
    let diff = (proc_1 - proc_2).abs();
    println!("{} days from {}-{}-{} to {}-{}-{}", diff, date_1[0], date_1[1], date_1[2], date_2[0], date_2[1], date_2[2]);
}

fn main() 
{
    let date_1:[int, ..3];
    let date_2:[int, ..3];
    date_1 = [01, 01, 1901];
    date_2 = [01, 01, 3001];
    days_diff(&date_1, &date_2);
}