Add format parameter to DateFormatterFactory

[marvincaspar]

Description (*)

Fixes incorrect datetime parsing caused by using locale-dependent IntlDateFormatter::parse() without an explicit pattern when processing ISO-formatted datetime strings.

Magento currently creates an IntlDateFormatter using SHORT date/time styles and then parses values such as:

YYYY-MM-DD HH:MM:SS

However, SHORT formats are locale-dependent (e.g. dd.MM.yy HH:mm in de_DE) and do not match ISO datetime strings. As a result, parsing is undefined and may produce incorrect timestamps instead of failing.

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes IntlDateFormatter::parse() misparses ISO datetime string in PHP 8.4 (returns incorrect date) #40524

Manual testing scenarios (*)

$formatter = new \IntlDateFormatter(
    'de_DE',
    \IntlDateFormatter::SHORT,
    \IntlDateFormatter::SHORT,
    'UTC',
    null,
    'yyyy-MM-dd HH:mm:ss'
);

$timestamp = $formatter->parse('2026-02-10 10:49:38');
var_dump(date('Y-m-d H:i:s', $timestamp));

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

[m2-assistant]

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[marvincaspar]

@magento run all tests

[marvincaspar]

@magento run all tests

[marvincaspar]

@magento run Static Tests, Unit Tests

[marvincaspar]

@magento run Static Tests

[marvincaspar]

@magento run all tests

[marvincaspar]

@magento run all tests

[marvincaspar]

@magento run Functional Tests B2B, Functional Tests CE, Functional Tests EE, Integration Tests

[marvincaspar]

@engcom-Bravo, the functional and integration tests are failing but thats not because of my change. Can you please verify. From my point of view I'm ready with this PR