Using ChatGPT to generate javascript for code node

Questions
1

I asked “write javascript for n8n code node that tells me if it is the 4th Wednesday of the month” and it generated the code below (which worked when I commented out line 1):

const { DateTime } = require("luxon");

// Get the current date
const now = DateTime.now();

// Check if today is the 4th Wednesday of the month
if (now.weekday === 3 && now.day > 22 && now.day <= 28) {
  // Today is the 4th Wednesday of the month
  return { message: "Today is the 4th Wednesday of the month" };
} else {
  // Today is not the 4th Wednesday of the month
  return { message: "Today is not the 4th Wednesday of the month" };
}

I then asked “Update the script so I can use it in future months and years”

const { DateTime } = require("luxon");

// Get the current date
const now = DateTime.now();

// Calculate the 4th Wednesday of the month
const year = now.year;
const month = now.month;
const firstDayOfMonth = DateTime.local(year, month, 1);
const firstWednesday = firstDayOfMonth.plus({ days: (3 - firstDayOfMonth.weekday + 7) % 7 });
const fourthWednesday = firstWednesday.plus({ weeks: 3 });

// Check if today is the 4th Wednesday of the month
if (now.toISODate() === fourthWednesday.toISODate()) {
  // Today is the 4th Wednesday of the month
  return { message: "Today is the 4th Wednesday of the month" };
} else {
  // Today is not the 4th Wednesday of the month
  return { message: "Today is not the 4th Wednesday of the month" };
}

It seems to work, but as a non-coder I’m not 100% sure!

Does it make sense?

3

Short answer

To get this to run in the Code node, you’ll need to remove the first line (where you require Luxon) Luxon is automatically available in n8n already.

Once I remove that line, and ran the code in the Code node, it worked (delightfully, today is the 4th Wednesday of the month)

A bit more detail

As you mentioned you’re not a coder, you may be wondering what Luxon is. It’s a JavaScript library to make working with date and time easier. Luxon website if you want to check it out.

Luxon in n8n provides a lot of utility: more info in the docs

If you want to, you can simplify your code a little more: n8n uses Luxon to provide two custom variables, including $now, which is equivalent to DateTime.now(). So your final code could look like this:

// Calculate the 4th Wednesday of the month
const year = $now.year;
const month = $now.month;
const firstDayOfMonth = DateTime.local(year, month, 1);
const firstWednesday = firstDayOfMonth.plus({ days: (3 - firstDayOfMonth.weekday + 7) % 7 });
const fourthWednesday = firstWednesday.plus({ weeks: 3 });

// Check if today is the 4th Wednesday of the month
if ($now.toISODate() === fourthWednesday.toISODate()) {
  // Today is the 4th Wednesday of the month
  return { message: "Today is the 4th Wednesday of the month" };
} else {
  // Today is not the 4th Wednesday of the month
  return { message: "Today is not the 4th Wednesday of the month" };
}