Use phabricator_ time functions in more places

Summary:
Replace some more date() calls with locale-aware calls.

Also, at least on my system, the DateTimeZone / DateTime stuff didn't actually
work and always rendered in UTC. Fixed that.

Test Plan:
Viewed daemon console, differential revisions, files, and maniphest timestamps
in multiple timezones.

Reviewed By: toulouse
Reviewers: toulouse, fratrik, jungejason, aran, tuomaspelkonen
CC: aran, toulouse
Differential Revision: 530

src/applications/files/controller/view/PhabricatorFileViewController.php

@@ -28,6 +28,9 @@ class PhabricatorFileViewController extends PhabricatorFileController {
 
   public function processRequest() {
 
+    $request = $this->getRequest();
+    $user = $request->getUser();
+
     $file = id(new PhabricatorFile())->loadOneWhere(
       'phid = %s',
       $this->phid);
@@ -93,7 +96,7 @@ class PhabricatorFileViewController extends PhabricatorFileController {
         id(new AphrontFormStaticControl())
           ->setLabel('Created')
           ->setName('created')
-          ->setValue(date('Y-m-d g:i:s A', $file->getDateCreated())))
+          ->setValue(phabricator_datetime($file->getDateCreated(), $user)))
       ->appendChild(
         id(new AphrontFormStaticControl())
           ->setLabel('Mime Type')

src/applications/files/controller/view/__init__.php

@@ -18,6 +18,7 @@ phutil_require_module('phabricator', 'view/form/base');
 phutil_require_module('phabricator', 'view/form/control/static');
 phutil_require_module('phabricator', 'view/form/control/submit');
 phutil_require_module('phabricator', 'view/layout/panel');
+phutil_require_module('phabricator', 'view/utils');
 
 phutil_require_module('phutil', 'markup');
 phutil_require_module('phutil', 'utils');