Using Z in the format pattern (using time zone) throws an error

[micaelmbagira]

I am running this example taken from https://date-fns.org/v2.4.1/docs/Time-Zones

const { zonedTimeToUtc, utcToZonedTime, format } = require('date-fns-tz');

const zonedDate = utcToZonedTime(Date.now(), 'Europe/Berlin');
const pattern = 'd.m.yyyy HH:mm:ss.SSS [GMT]Z (z)';
const output = format(zonedDate, pattern, { timeZone: 'Europe/Berlin' });

and I get the following error

RangeError: Format string contains an unescaped latin alphabet character Z

Even though Z is in the list of available tokens: https://date-fns.org/v2.4.1/docs/format

[dkozickis]

Hi @micaelmbagira! Docs seem to be slightly out of date.

• Z (uppercase) is not accepted anymore (docs are correct on that)
• You'll have to use XXX for GMT offset

Following should work

const { zonedTimeToUtc, utcToZonedTime, format } = require('date-fns-tz');

const zonedDate = utcToZonedTime(Date.now(), "Europe/Berlin");
const pattern = "d.m.yyyy HH:mm:ss.SSS 'GMT' XXX (z)";
const output = format(zonedDate, pattern, { timeZone: "Europe/Berlin" });

See repro here - https://codesandbox.io/embed/adoring-hermann-yb7fx

We'll update the docs.

[masbaehr]

still wrong as of today: https://date-fns.org/v2.12.0/docs/Time-Zones

[kossnocorp]

@masbaehr sorry I must have missed a pull-request from you.

[kossnocorp]

@masbaehr weird, I couldn't find it so I did it myself ¯\(ツ)/¯

[masbaehr]

@masbaehr weird, I couldn't find it so I did it myself ¯_(ツ)_/¯

Haha of course you did not find it - there is none. I just mentioned it as i came across it while switching from moment to date-fns ;D since the pattern is "Z" there

[kossnocorp]

Ok, I see. You just sounded like someone who's tried to help but got ignored.