phabricator_format_timestamp => phabricator_datetime

Summary: make the change, kill the function.   be sure to get a good $user or
$viewer variable

Test Plan:
for each controller or view, look at it in the ui.   change timezone, refresh ui
and note change.   i did not test the OAuthSettingsPanelController; not sure how
to get to that badboy and i got a bit lazy

Maniphest Tasks: T222

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, btrahan, epriestley

Maniphest Tasks: T222

Differential Revision: 1166

src/applications/differential/controller/revisionview/DifferentialRevisionViewController.php

@@ -214,6 +214,7 @@ class DifferentialRevisionViewController extends DifferentialController {
     $diff_history->setSelectedVersusDiffID($diff_vs);
     $diff_history->setSelectedDiffID($target->getID());
     $diff_history->setSelectedWhitespace($whitespace);
+    $diff_history->setUser($user);
 
     $local_view = new DifferentialLocalCommitsView();
     $local_view->setUser($user);