node cron implementation comparison.js

// Timer helper
class Timer {
	constructor() {
		this.t = process.hrtime.bigint();
	}
	end() {
		return Number((process.hrtime.bigint() - this.t)/BigInt(1000))/1000;
	}
};

// Run all test cases
runtest("When is next saturday 29th of february","0 0 0 29 2 6");
runtest("When is next 15th of february","0 0 0 15 2 *");
runtest("When is next monday in october","0 0 0 * 10 1");
runtest("When is 23:00 next 31st march","0 0 23 31 3 *");

// Run test using all libraries and specified pattern
function runtest(text, targetPattern) {

	console.log("");
	console.log("Test: " + text + ", pattern '"+targetPattern+"'");
	console.log("");

	// node-schedule
	const schedule = require("node-schedule");
	let nsTime = new Timer();
	const job = schedule.scheduleJob(targetPattern, function(){
		console.log('This will not run right now');
	});
	console.log("node-schedule:    " + new Date(job.nextInvocation()).toLocaleString() + " in " + nsTime.end() + "ms");

	// cronosjs
	const cronos = require("cronosjs");
	let cjTime = new Timer();
	const cjJob = cronos.CronosExpression.parse(targetPattern);
	console.log("cronosjs:         " + new Date(cjJob.nextDate()).toLocaleString() + " in " + cjTime.end() + "ms");

	// node-cron
	const nodecron = require("node-cron");
	let ncTime = new Timer();
	const job2 = nodecron.schedule(targetPattern, function(a,b,c){
		console.log('This will not run right now');
	});
	console.log("node-cron:        ???" +  "                 in " + ncTime.end() + "ms");

	// cron
	const CronJob = require("cron").CronJob;
	let cTime = new Timer();
	const job3 = new CronJob(targetPattern, function(){
		console.log('This will not run right now');
	});
	console.log("cron:             " + new Date(job3.nextDates()).toLocaleString() + " in " + cTime.end() + "ms");

	// Croner
	const Cron = require("croner");
	let cronerTime = new Timer();
	const job4 = Cron(targetPattern, { legacyMode: true}, function(){
		console.log('This will not run right now');
	});
	console.log("croner (legacy mode, default):  " + job4.next().toLocaleString() + " in " + cronerTime.end() + "ms");

	// Croner
	const Cron2 = require("croner");
	let croner2Time = new Timer();
	const job5 = Cron(targetPattern, { legacyMode: false}, function(){
		console.log('This will not run right now');
	});
	console.log("croner (croner mode): " + job5.next().toLocaleString() + " in " + croner2Time.end() + "ms");
}

👍

Improved version available at https://github.com/hexagon/cron-comparison