Benchmark time subtraction: process.hrtime; process.hrtime.bigint(); Date.now()

benchmark-processHrtime-vs-dateNow.js

/**
 * I know that the process.hrtime as a higher precision over the
 * Date constructor object so it's not a "fair" benchmark,
 * but if you doesn't need a high precision timer and you just want
 * to compare the fastest time subtraction this benchmark can
 * be usefull
 * 
 * Licensed under MIT
 * Copyright (c) 2020 [Samuel Carreira]
 */

const benchmark = require('nodemark');
const os = require('os');

function dateNow() {
    const t = Date.now();
    return Date.now() - t; // milliseconds
}

function hrTimeBigInt() {
    const t = process.hrtime.bigint();
    return process.hrtime.bigint() - t; // nanoseconds
}

function hrTime() {
    const t = process.hrtime();
    const diff = process.hrtime(t);
    return diff[0] * 1e9 + diff[1]; // nanoseconds
}

console.log(`Node ${process.version}`);
console.log(`CPU ${os.cpus()[0].model}`);

console.log('process.hrtime: ' + benchmark(hrTime));
console.log('process.hrtime.bigint(): ' + benchmark(hrTimeBigInt));
console.log('Date.now(): ' + benchmark(dateNow));

Run 1:
Node v18.13.0
CPU Apple M1 Max
process.hrtime: 14,693,093 ops/sec ±0.42% (16188265 samples)
process.hrtime.bigint(): 12,370,171 ops/sec ±0.29% (16894424 samples)
Date.now(): 12,599,143 ops/sec ±0.33% (15674109 samples)

Run 2:
Node v18.13.0
CPU Apple M1 Max
process.hrtime: 14,652,087 ops/sec ±0.43% (16216034 samples)
process.hrtime.bigint(): 12,301,886 ops/sec ±0.28% (16976581 samples)
Date.now(): 12,799,446 ops/sec ±0.31% (15855477 samples)

Interesting results.