dirty_logging 0.1.0

A fast (to code), stateless logging utility with no dependancies to output to stout or output.log with ease.
Documentation 
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use std::time::{SystemTime, UNIX_EPOCH};
use std::collections::BTreeMap;

pub fn timestamp() -> String {
    let now: u128 = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_millis();
    millis_to_iso_8601(&now)
}

fn count_years_from_days(days: &u128) -> (u128, u128, bool){
    let mut days: u128 = *days;
    let mut year: u128 = 1970;
    let mut leap_year: bool = false;
    //statically drop out two years to make leap year calculations easier
    if days > (2*365){
        days = days - (2*365);
        year = year + 2;
    };
    let leap_cycles = days / (365 * 4 + 1);
    days = days - (leap_cycles * (365 * 4 + 1));
    let years = days / 365;
    days = days - (years * 365);
    year = year + (leap_cycles * 4) + years;
    //technically this calculation is only good until 2100, since that year will not be a leap year.
    //since this is for current time timestamp calculations, this is likely irrelevant.
    if ((year/4)*4) == year{
        leap_year = true;
    };
    (year, days, leap_year)
}

fn get_month_from_day(days: &u128, leap: &bool) -> u8{
    let mut months = BTreeMap::new();
    months.insert(1_u8, 31_i16);
    if *leap{
        months.insert(2_u8, 29_i16);
    } else {
        months.insert(2_u8, 28_i16);
    };
    months.insert(3_u8, 31_i16);
    months.insert(4_u8, 30_i16);
    months.insert(5_u8, 31_i16);
    months.insert(6_u8, 30_i16);
    months.insert(7_u8, 31_i16);
    months.insert(8_u8, 31_i16);
    months.insert(9_u8, 30_i16);
    months.insert(10_u8, 31_i16);
    months.insert(11_u8, 30_i16);
    months.insert(12_u8, 31_i16);
    let mut month:u8 = 0;
    let mut days = i16::try_from(*days).ok().unwrap();
    for (k,v) in months{
        days = days - v;
        if days < 1{
            month = k;
            break;
        }
    }
    month
}

fn millis_to_iso_8601(time: &u128) -> String {
    let mut milliseconds = *time;
    let day: u128 = 86_400_000;
    let hour: u128 = 3_600_000;
    let minute: u128 = 60_000;
    let second: u128 = 1_000;
    //this is only meant to be used as a reference to current time
    //therefore we will only reference the current leap-second count of 27 as of 20250111
    //let milliseconds = &(milliseconds + 27_000);
    let days = milliseconds/day;
    milliseconds = milliseconds - (days * day);
    let hours = milliseconds/hour;
    milliseconds = milliseconds - (hours * hour);
    let minutes = milliseconds/minute;
    milliseconds = milliseconds - (minutes * minute);
    let seconds = milliseconds/second;
    milliseconds = milliseconds - (seconds * second);
    let (years, days, leap_year) = count_years_from_days(&days);
    let month = get_month_from_day(&days, &leap_year);
    format!("{:0>4}-{:0>2}-{:0>2}T{:0>2}:{:0>2}:{:0>2}.{:0>3}Z", years, month, days, hours, minutes, seconds, milliseconds)
}