Create a file name is YYYY-MM-DD.js, if file existes, append content to file

yyyy-mm-dd.js

var fs = require('fs');

var date = new Date();
var month = date.getMonth() + 1;
month = (month < 10 ? '0' : '') + month;
var day = date.getDate();
day = (day < 10 ? '0' : '') + day;
var filename = date.getFullYear() + '-' + month + '-' + day + '.js';

content = 'Content to add/append to file';

fs.stat(filename, function(err, stat) {
    if (err == null) {
        fs.appendFile(filename, content, function(err) {
            if (err) console.error(err);
        });
    } else if (err.code == 'ENOENT') {
        console.log('File does not exists');
        fs.writeFile(filename, content, function(err) {
					if(err) return console.log(err);
				}); 
    } else {
        console.log('Error: ', err.code);
    }
});