diff --git a/src/Symfony/Component/Yaml/Inline.php b/src/Symfony/Component/Yaml/Inline.php
index 2f33429910065..54da91ef48d90 100644
--- a/src/Symfony/Component/Yaml/Inline.php
+++ b/src/Symfony/Component/Yaml/Inline.php
@@ -110,7 +110,16 @@ public static function dump(mixed $value, int $flags = 0): string
 
                 return self::dumpNull($flags);
             case $value instanceof \DateTimeInterface:
-                return $value->format('c');
+                $length = \strlen(rtrim($value->format('u'), '0'));
+                if (0 === $length) {
+                    $format = 'c';
+                } elseif ($length < 4) {
+                    $format = 'Y-m-d\TH:i:s.vP';
+                } else {
+                    $format = 'Y-m-d\TH:i:s.uP';
+                }
+
+                return $value->format($format);
             case $value instanceof \UnitEnum:
                 return sprintf('!php/const %s::%s', $value::class, $value->name);
             case \is_object($value):
@@ -712,15 +721,20 @@ private static function evaluateScalar(string $scalar, int $flags, array &$refer
                             return $time;
                         }
 
-                        try {
-                            if (false !== $scalar = $time->getTimestamp()) {
-                                return $scalar;
+                        $length = \strlen(rtrim($time->format('u'), '0'));
+                        if (0 === $length) {
+                            try {
+                                if (false !== $scalar = $time->getTimestamp()) {
+                                    return $scalar;
+                                }
+                            } catch (\ValueError) {
+                                // no-op
                             }
-                        } catch (\ValueError) {
-                            // no-op
+
+                            return (int) $time->format('U');
                         }
 
-                        return $time->format('U');
+                        return (float) $time->format('U.u');
                 }
         }
 
diff --git a/src/Symfony/Component/Yaml/Tests/DumperTest.php b/src/Symfony/Component/Yaml/Tests/DumperTest.php
index 47c0aa3578b29..54ffa37e77180 100644
--- a/src/Symfony/Component/Yaml/Tests/DumperTest.php
+++ b/src/Symfony/Component/Yaml/Tests/DumperTest.php
@@ -922,6 +922,52 @@ public function testDumpIdeographicSpaces()
         ], 2));
     }
 
+    /**
+     * @dataProvider getDateTimeData
+     */
+    public function testDumpDateTime(array $input, string $expected)
+    {
+        $this->assertSame($expected, rtrim($this->dumper->dump($input, 1)));
+    }
+
+    public function getDateTimeData()
+    {
+        yield 'Date without subsecond precision' => [
+            ['date' => new \DateTimeImmutable('2023-01-24T01:02:03Z')],
+            'date: 2023-01-24T01:02:03+00:00',
+        ];
+
+        yield 'Date with one digit for milliseconds' => [
+            ['date' => new \DateTimeImmutable('2023-01-24T01:02:03.4Z')],
+            'date: 2023-01-24T01:02:03.400+00:00',
+        ];
+
+        yield 'Date with two digits for milliseconds' => [
+            ['date' => new \DateTimeImmutable('2023-01-24T01:02:03.45Z')],
+            'date: 2023-01-24T01:02:03.450+00:00',
+        ];
+
+        yield 'Date with full milliseconds' => [
+            ['date' => new \DateTimeImmutable('2023-01-24T01:02:03.456Z')],
+            'date: 2023-01-24T01:02:03.456+00:00',
+        ];
+
+        yield 'Date with four digits for microseconds' => [
+            ['date' => new \DateTimeImmutable('2023-01-24T01:02:03.4567Z')],
+            'date: 2023-01-24T01:02:03.456700+00:00',
+        ];
+
+        yield 'Date with five digits for microseconds' => [
+            ['date' => new \DateTimeImmutable('2023-01-24T01:02:03.45678Z')],
+            'date: 2023-01-24T01:02:03.456780+00:00',
+        ];
+
+        yield 'Date with full microseconds' => [
+            ['date' => new \DateTimeImmutable('2023-01-24T01:02:03.456789Z')],
+            'date: 2023-01-24T01:02:03.456789+00:00',
+        ];
+    }
+
     private function assertSameData($expected, $actual)
     {
         $this->assertEquals($expected, $actual);
diff --git a/src/Symfony/Component/Yaml/Tests/InlineTest.php b/src/Symfony/Component/Yaml/Tests/InlineTest.php
index 46d30f12044e5..dc21c4dde70dd 100644
--- a/src/Symfony/Component/Yaml/Tests/InlineTest.php
+++ b/src/Symfony/Component/Yaml/Tests/InlineTest.php
@@ -563,9 +563,10 @@ public function getTestsForDump()
     /**
      * @dataProvider getTimestampTests
      */
-    public function testParseTimestampAsUnixTimestampByDefault(string $yaml, int $year, int $month, int $day, int $hour, int $minute, int $second)
+    public function testParseTimestampAsUnixTimestampByDefault(string $yaml, int $year, int $month, int $day, int $hour, int $minute, int $second, int $microsecond)
     {
-        $this->assertSame(gmmktime($hour, $minute, $second, $month, $day, $year), Inline::parse($yaml));
+        $expectedDate = (new \DateTimeImmutable($yaml))->format('U');
+        $this->assertSame($microsecond ? (float) "$expectedDate.$microsecond" : (int) $expectedDate, Inline::parse($yaml));
     }
 
     /**
diff --git a/src/Symfony/Component/Yaml/Tests/ParserTest.php b/src/Symfony/Component/Yaml/Tests/ParserTest.php
index 148a139be1206..4cddeca1c733e 100644
--- a/src/Symfony/Component/Yaml/Tests/ParserTest.php
+++ b/src/Symfony/Component/Yaml/Tests/ParserTest.php
@@ -1541,6 +1541,15 @@ public function getInvalidBinaryData()
         ];
     }
 
+    public function testParseDateWithSubseconds()
+    {
+        $yaml = <<<'EOT'
+date: 2002-12-14T01:23:45.670000Z
+EOT;
+
+        $this->assertSameData(['date' => 1039829025.67], $this->parser->parse($yaml));
+    }
+
     public function testParseDateAsMappingValue()
     {
         $yaml = <<<'EOT'