bug #22996 [2.7][Form] Fix \IntlDateFormatter timezone parameter usag…

…e to bypass PHP bug #66323 (romainneutron)

This PR was merged into the 2.7 branch.

Discussion
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[2.7][Form] Fix \IntlDateFormatter timezone parameter usage to bypass PHP bug #66323

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no <!-- don't forget updating src/**/CHANGELOG.md files -->
| BC breaks?    | no
| Deprecations? | no <!-- don't forget updating UPGRADE-*.md files -->
| Tests pass?   | yes
| Fixed tickets | N/A <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        | N/A

The issue is documented here.
The current symfony code works when `intl.use_exception` is off. however, it's on on PHP 7+ and the issue is reproducible. See https://3v4l.org/PllP1 and https://3v4l.org/3XnKI

Commits
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f42c73f [Form] Fix \IntlDateFormatter timezone parameter usage to bypass PHP bug #66323

src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToLocalizedStringTransformer.php

@@ -163,6 +163,10 @@ protected function getIntlDateFormatter($ignoreTimezone = false)
         $dateFormat = $this->dateFormat;
         $timeFormat = $this->timeFormat;
         $timezone = $ignoreTimezone ? 'UTC' : $this->outputTimezone;
+        if (class_exists('IntlTimeZone', false)) {
+            // see https://bugs.php.net/bug.php?id=66323
+            $timezone = \IntlTimeZone::createTimeZone($timezone);
+        }
         $calendar = $this->calendar;
         $pattern = $this->pattern;
 

src/Symfony/Component/Form/Extension/Core/Type/DateType.php

@@ -77,7 +77,8 @@ public function buildForm(FormBuilderInterface $builder, array $options)
                 \Locale::getDefault(),
                 $dateFormat,
                 $timeFormat,
-                null,
+                // see https://bugs.php.net/bug.php?id=66323
+                class_exists('IntlTimeZone', false) ? \IntlTimeZone::createDefault() : null,
                 $calendar,
                 $pattern
             );