Get the creation date for a generated mongo id

mongo-creation-date.js

#!/usr/bin/env node

var getDate = function(id) {
	return new Date(parseInt(id.toString().slice(0, 8), 16) * 1000);
}

if (process.argv.length > 2) {
	process.argv.slice(2).forEach(function (val, i) {
		console.log(val + ": " + getDate(val));
	});
} else {
	var readline = require('readline');
	var rl = readline.createInterface({
		input: process.stdin,
		output: process.stdout,
		terminal: false
	});

	rl.on('line', function(line){
		console.log(getDate(line));
	});
}