Iterate through a range of dates in NodeJS

You can use moment.js in a node.js application.

npm install moment

Then you can very easily do this:

var moment = require('moment');

var a = moment('2013-01-01');
var b = moment('2013-06-01');

// If you want an exclusive end date (half-open interval)
for (var m = moment(a); m.isBefore(b); m.add(1, 'days')) {
  console.log(m.format('YYYY-MM-DD'));
}

// If you want an inclusive end date (fully-closed interval)
for (var m = moment(a); m.diff(b, 'days') <= 0; m.add(1, 'days')) {
  console.log(m.format('YYYY-MM-DD'));
}

Hmmm... this looks a lot like the code you already wrote in your own answer. Moment.js is a more popular library has tons of features, but I wonder which one performs better? Perhaps you can test and let us know. :)

But neither of these do as much as JodaTime. For that, you need a library that implements the TZDB in JavaScript. I list some of those here.

Also, watch out for problems with JavaScript dates in general. This affects NodeJS as well.

I would propose a change to the earlier response by Matt. His code will cause a mutation on the a object. try this...

var moment = require('moment');
var a = moment('2013-01-01');
var b = moment('2013-06-01');

for (var m = moment(a); m.isBefore(b); m.add(1, 'days')) {
    console.log(m.format('YYYY-MM-DD'));
}

Here's one solution without external libraries:

  var start = new Date('October 1, 2020 03:00:00Z');
  var now = new Date();

  for (var d = start; d < now; d.setDate(d.getDate() + 1)) {
    console.log(d);
  }

Result:

2020-10-01T03:00:00.000Z
2020-10-02T03:00:00.000Z
2020-10-03T03:00:00.000Z
2020-10-04T03:00:00.000Z
2020-10-05T03:00:00.000Z
2020-10-06T03:00:00.000Z

The Z at the end of the first date is for UTC. If you want your time zone, just remove the Z.

Use the https://github.com/JerrySievert/node-date-utils framework, then you can iterate easily like this:

require('date-utils');

var d = new Date('2013-01-01');
var e = new Date('2013-06-01');

for(var i = d; i.isBefore(e); i.addDays(1)) {
  console.log(i.toFormat("YYYY-MM-DD"));  
}