`MessageFormatter` uses default timezone to format dates

[MatTheCat]

Description

The following code:

<?php

date_default_timezone_set('UTC');

echo MessageFormatter::formatMessage(
    'fr_FR',
    '{datetime, time, short}',
    ['datetime' => new DateTimeImmutable('2023-03-27T12:00', new DateTimeZone('Europe/Paris'))]
);

Resulted in this output:

10:00

But I expected this output instead:

12:00

PHP Version

all

Operating System

No response

[damianwadley]

The main problem I see is that ICU's MessageFormatter doesn't seem to support this sort of behavior: internally, the date being passed for formatting is actually just a numeric timestamp. Which means there's a big question of what to do if you try to format a message with multiple DateTimes in different timezones...

I'm changing this to a feature request of having a way to specify the timezone on the MessageFormatter directly, instead of relying on PHP's default timezone with no way (that I saw) to change that.

[MatTheCat]

Okay I guess this won’t be simple to implement 😅

As a workaround I’ll pass datetimes as strings returned by IntlDateFormatter.

[heiglandreas]

I'd suggest to set the default timezone to Europe/Paris to get the correct result.

[MatTheCat]

In my case the timezone is dynamic so I cannot act on the server's.