There were 3 failures:

1) Symfony\Component\Yaml\Tests\InlineTest::testParseTimestampAsDateTimeObject with data set "date" ('2001-12-15', 2001, 12, 15, 0, 0, 0)
Failed asserting that two DateTime objects are equal.
--- Expected
+++ Actual
@@ @@
-2001-12-15T23:00:00+0000
+2001-12-14T23:00:00+0000

2) Symfony\Component\Yaml\Tests\InlineTest::testParseNestedTimestampListAsDateTimeObject with data set "date" ('2001-12-15', 2001, 12, 15, 0, 0, 0)
Failed asserting that two arrays are equal.
--- Expected
+++ Actual
@@ @@
 Array (
     'nested' => Array (
-        0 => 2001-12-15T23:00:00+0000
+        0 => 2001-12-14T23:00:00+0000
     )
 )

3) Symfony\Component\Yaml\Tests\ParserTest::testParseDateAsMappingValue
Failed asserting that two arrays are equal.
--- Expected
+++ Actual
@@ @@
 Array (
-    'date' => 2002-12-14T00:00:00+0000
+    'date' => 2002-12-13T23:00:00+0000
 )

FAILURES!
Tests: 559, Assertions: 787, Failures: 3.