Help with formatISO

[laurensiusadi]

I'm trying to use formatISO from the docs
The example as follows:

const result = formatISO(new Date(2019, 8, 18, 19, 0, 52))
//=> '2019-09-18T19:00:52Z'

But instead I'm getting 2019-09-18T19:00:52+07:00

How do I get the format like in the docs?

[devuxer]

1. Easiest way I know of is to just use the built-in JS functiontoISOString(), though it's not exactly the same as the date-fns docs.

const result = new Date(2019, 8, 18, 19, 0, 52).toISOString();
// "2019-09-18T19:00:52.000Z"

2. You could kind of fudge it like this:

const result = format(new Date(2019, 8, 18, 19, 0, 52), "yyyy-MM-dd'T'HH:mm:ss'z'")
// "2019-09-18T19:00:52z"

3. Finally, you could go into your OS settings and change the time zone to "(UTC) Coordinate Universal Time" (or equivalent), then try your code again. You should get exactly what's in the date-fns docs. (This is probably not practical unless you can count on your code always running on a server with this setting.)

[safareli]

[laurensiusadi]

@safareli This will depends on your local UTC time. So the native Date method won't work.
I end up using the formatISO above with +00:00 timezone because it just works when you do parseISO it will transform back to correct Date object.

I found a way to get the result, but didn't use it. So I haven't tested this code.

function toUTC(date) {
  return dateFns.subMinutes(date, date.getTimezoneOffset())
}

[Shyam-Chen]

import * as d from 'date-fns';

const t = new Date();

const a = d.format(toUTC(t), "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
const b = t.toISOString();

function toUTC(date: Date) {
  return d.addMinutes(date, date.getTimezoneOffset());
}

console.log(a === b); // true