bug #18821 [2.3][Form] Removed UTC specification with timestamp (fran…

…cisbesset)

This PR was merged into the 2.3 branch.

Discussion
----------

[2.3][Form] Removed UTC specification with timestamp

| Q             | A
| ------------- | ---
| Branch?       | 2.3
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

The function `date_parse()` indicates a warning if a timezone is used with the timestamp: `Double timezone specification`. I removed the UTC specification and this time it's more faster!

Commits
-------

0d14aac Removed UTC specification with timestamp

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

@@ -126,7 +126,7 @@ public function reverseTransform($value)
 
         try {
             // read timestamp into DateTime object - the formatter delivers in UTC
-            $dateTime = new \DateTime(sprintf('@%s UTC', $timestamp));
+            $dateTime = new \DateTime(sprintf('@%s', $timestamp));
         } catch (\Exception $e) {
             throw new TransformationFailedException($e->getMessage(), $e->getCode(), $e);
         }