Formatting ISO time with Luxon

Question

Using Luxon JS, I've been trying to format datetime to output in a certain format, using the native toISO function:

This is what I get:

"2018-08-25T09:00:40.000-04:00"

And this is what I want:

"2018-08-25T13:00:40.000Z"

I know that they are both equivalent in terms of unix time and mean the same thing except in a different format, I just want to be able to out the second string rather than the first. I looked through the Luxon docs but was unable to find any arguments/options that would give me what I need.

Answer 1

As other already stated in the comments, you can use 2 approaches:

• Convert Luxon DateTime to UTC using toUTC:

  "Set" the DateTime's zone to UTC. Returns a newly-constructed DateTime.

• Use toISOString() method of JS Date.

  You can use toJSDate() to get the Date object from a luxon DateTime:

  Returns a JavaScript Date equivalent to this DateTime.

---

Examples:

const DateTime = luxon.DateTime;
const dt = DateTime.now();
console.log(dt.toISO())
console.log(dt.toUTC().toISO())
console.log(dt.toJSDate().toISOString())
console.log(new Date().toISOString())

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Answer 2

From documentation I saw that in the method .fromISO of DateTime you can add an option object after the string of ISO date ("2018-08-25T09:00:40.000-04:00" in your example). In this object specify zone: utc like that:

const DateTime = luxon.DateTime;

const stringDate = "2018-08-25T09:00:40.000-04:00";

const dt = DateTime.fromISO(stringDate, {zone: 'utc'});

console.log('This is your date format', dt.toISO())

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