diff --git a/.appveyor.yml b/.appveyor.yml
index 17723f34aa873..594fdc8d5c850 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -27,7 +27,7 @@ install:
     - echo max_execution_time=1200 >> php.ini-min
     - echo post_max_size=2047M >> php.ini-min
     - echo upload_max_filesize=2047M >> php.ini-min
-    - echo date.timezone="America/Los_Angeles" >> php.ini-min
+    - echo date.timezone="UTC" >> php.ini-min
     - echo extension_dir=ext >> php.ini-min
     - echo extension=php_xsl.dll >> php.ini-min
     - copy /Y php.ini-min php.ini-max
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToLocalizedStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToLocalizedStringTransformer.php
index b7ea092591d51..52ac9d9e9d4b4 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToLocalizedStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToLocalizedStringTransformer.php
@@ -82,7 +82,8 @@ public function transform(mixed $dateTime): string
             throw new TransformationFailedException('Expected a \DateTimeInterface.');
         }
 
-        $value = $this->getIntlDateFormatter()->format($dateTime->getTimestamp());
+        $timestamp = $this->getCalendarConvertingFormatter()->parse($dateTime->format('Y-m-d H:i:s'));
+        $value = $this->getIntlDateFormatter()->format($timestamp);
 
         if (0 != intl_get_error_code()) {
             throw new TransformationFailedException(intl_get_error_message());
@@ -134,7 +135,7 @@ public function reverseTransform(mixed $value): ?\DateTime
         try {
             if ($dateOnly) {
                 // we only care about year-month-date, which has been delivered as a timestamp pointing to UTC midnight
-                $dateTime = new \DateTime(gmdate('Y-m-d', $timestamp), new \DateTimeZone($this->outputTimezone));
+                $dateTime = new \DateTime($this->getCalendarConvertingFormatter()->format($timestamp), new \DateTimeZone($this->outputTimezone));
             } else {
                 // read timestamp into DateTime object - the formatter delivers a timestamp
                 $dateTime = new \DateTime(sprintf('@%s', $timestamp));
@@ -196,4 +197,11 @@ protected function isPatternDateOnly(): bool
         // check for the absence of time-related placeholders
         return 0 === preg_match('#[ahHkKmsSAzZOvVxX]#', $pattern);
     }
+
+    private function getCalendarConvertingFormatter(): \IntlDateFormatter
+    {
+        $timezone = $this->isPatternDateOnly() ? 'UTC' : $this->inputTimezone;
+
+        return new \IntlDateFormatter(\Locale::getDefault(), \IntlDateFormatter::MEDIUM, \IntlDateFormatter::NONE, new \DateTimeZone($timezone), \IntlDateFormatter::GREGORIAN, 'yyyy-MM-dd HH:mm:ss');
+    }
 }
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/DateTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/DateTypeTest.php
index dfbae933092da..e3fd5618fd815 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/Type/DateTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/DateTypeTest.php
@@ -1160,4 +1160,19 @@ protected function getTestOptions(): array
     {
         return ['widget' => 'choice'];
     }
+
+    public function testSubmitDateBeforeBeginningOfGregorianCalendar()
+    {
+        if (\PHP_INT_SIZE < 8) {
+            $this->markTestSkipped('Parsing three digits years requires a 64bit PHP.');
+        }
+
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'widget' => 'single_text',
+        ]);
+        $form->submit('950-12-19');
+
+        $this->assertSame('0950-12-19', $form->getData()->format('Y-m-d'));
+        $this->assertSame('0950-12-19', $form->getViewData());
+    }
 }