Calculates the exact duration in between 2 given dates.

duration.js

/*
DURATION
Calculates the exact duration in between 2 given dates.
Copyright (c) 2020 Abhishek Kumar.
Protected by Creative Commons license (CC BY 4.0).

@file     duration.js
@author   Abhishek Kumar
*/

const APP_VER = '1.0.0';
const MS_PER_DAY = 1000 * 60 * 60 * 24;

function dayDiff(a, b) {
    let utc1 = Date.UTC(a.getFullYear(), a.getMonth(), a.getDate());
    let utc2 = Date.UTC(b.getFullYear(), b.getMonth(), b.getDate());
    let utc = Math.floor((utc2 - utc1) / MS_PER_DAY);
    return utc;
}

function calcAge(days) {
    let y = Math.floor(days / 365);
    let m = Math.floor((days % 365) / 30);
    let d = Math.floor((days % 365) % 30);
    return `${y}y ${m}m ${d}d`;
}

function render(fromdate, todate) {
    let diff = dayDiff(new Date(fromdate), new Date(todate));
    let diffs = [
        `${calcAge(diff)}`,
        `${(diff / 365).toFixed(2)} years`,
        `${(diff / 30).toFixed(2)} months`,
        `${diff} days`,
        `${(diff / 7).toFixed(2)} weeks`,
        `${(diff * 24)} hours`,
        `${(diff * 24 * 60)} minutes`,
        `${(diff * 24 * 60 * 60)} seconds`,
    ];
    return `${diffs.join('\n')}`;
}

export function duration(argv) {
    if (argv.h || argv.help) {
        return `
Calculates the exact difference in between 2 given dates.

Syntax:
 duration [from-date] [to-date]
 
 where,
  [from-date]   From date in YYYY-MM-DD format
  [to-date]     To date in YYYY-MM-DD format

Options:
 -h --help   show help options
 -v --ver    show version
        `;
    } else if (argv.v || argv.ver) {
        return `DURATION (Version ${APP_VER})`;
    } else if (argv._.length == 0) {
        return `Missing both dates`;
    } else if (argv._.length == 1) {
        return `Missing another date`;
    } else {
        return render(argv._[0], argv._[1]);
    }
}

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