Make "Countdown" aware of time locales

Summary:
When you type "5 PM", it should mean "5 PM in your local time", not "5 PM in the
server's time". Use locale-aware functions to read and write times.

Also a couple of usability tweaks.

Test Plan:
Swapped my time between America/Los_Angeles and America/New_York and created a
bunch of countdowns.

Reviewed By: jungejason
Reviewers: hsb, toulouse, jungejason, tuomaspelkonen, aran
CC: aran, jungejason
Differential Revision: 531

src/applications/countdown/controller/edit/PhabricatorCountdownEditController.php

@@ -55,18 +55,25 @@ class PhabricatorCountdownEditController
       $errors = array();
       $title = $request->getStr('title');
       $datepoint = $request->getStr('datepoint');
-      $timestamp = strtotime($datepoint);
 
       $e_text = null;
       if (!strlen($title)) {
         $e_text = 'Required';
-        $errors[] = 'You must give it a name';
+        $errors[] = 'You must give it a name.';
       }
 
-      if ($timestamp === false) {
+      // If the user types something like "5 PM", convert it to a timestamp
+      // using their local time, not the server time.
+      $timezone = new DateTimeZone($user->getTimezoneIdentifier());
+
+      try {
+        $date = new DateTime($datepoint, $timezone);
+        $timestamp = $date->format('U');
+      } catch (Exception $e) {
         $errors[] = 'You entered an incorrect date. You can enter date like'.
           ' \'2011-06-26 13:33:37\' to create an event at'.
-          ' 13:33:37 on the 26th of June 2011';
+          ' 13:33:37 on the 26th of June 2011.';
+        $timestamp = null;
       }
 
       $timer->setTitle($title);
@@ -77,8 +84,7 @@ class PhabricatorCountdownEditController
         $timer->save();
         return id(new AphrontRedirectResponse())
           ->setURI('/countdown/'.$timer->getID().'/');
-      }
-      else {
+      } else {
         $error_view = id(new AphrontErrorView())
           ->setErrors($errors)
           ->setTitle('It\'s not The Final Countdown (du nu nuuu nun)' .
@@ -86,6 +92,14 @@ class PhabricatorCountdownEditController
       }
     }
 
+    if ($timer->getDatePoint()) {
+      $display_datepoint = phabricator_datetime(
+        $timer->getDatePoint(),
+        $user);
+    } else {
+      $display_datepoint = $request->getStr('datepoint');
+    }
+
     $form = id(new AphrontFormView())
       ->setUser($user)
       ->setAction($request->getRequestURI()->getPath())
@@ -97,9 +111,13 @@ class PhabricatorCountdownEditController
       ->appendChild(
         id(new AphrontFormTextControl())
           ->setLabel('End date')
-          ->setValue(strftime("%F %H:%M:%S", $timer->getDatePoint()))
+          ->setValue($display_datepoint)
           ->setName('datepoint')
-          ->setCaption('Post any date that is parsable by strtotime'))
+          ->setCaption(
+            'Examples: '.
+            '<tt>2011-12-25</tt> or '.
+            '<tt>3 hours</tt> or '.
+            '<tt>June 8 2011, 5 PM</tt>.'))
       ->appendChild(
         id(new AphrontFormSubmitControl())
           ->addCancelButton('/countdown/')

src/applications/countdown/controller/edit/__init__.php

@@ -15,6 +15,7 @@ phutil_require_module('phabricator', 'view/form/control/submit');
 phutil_require_module('phabricator', 'view/form/control/text');
 phutil_require_module('phabricator', 'view/form/error');
 phutil_require_module('phabricator', 'view/layout/panel');
+phutil_require_module('phabricator', 'view/utils');
 
 phutil_require_module('phutil', 'utils');
 

src/applications/countdown/controller/view/PhabricatorCountdownViewController.php

@@ -49,8 +49,9 @@ class PhabricatorCountdownViewController
     $content =
       '<div class="phabricator-timer">
         <h1 class="phabricator-timer-header">'.
-          phutil_escape_html($timer->getTitle()).'
-        </h1>
+          phutil_escape_html($timer->getTitle()).' &middot; '.
+          phabricator_datetime($timer->getDatePoint(), $user).
+        '</h1>
         <div class="phabricator-timer-pane">
           <table class="phabricator-timer-table">
             <tr>

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

@@ -11,6 +11,7 @@ phutil_require_module('phabricator', 'applications/countdown/controller/base');
 phutil_require_module('phabricator', 'applications/countdown/storage/timer');
 phutil_require_module('phabricator', 'infrastructure/celerity/api');
 phutil_require_module('phabricator', 'infrastructure/javelin/api');
+phutil_require_module('phabricator', 'view/utils');
 
 phutil_require_module('phutil', 'markup');
 phutil_require_module('phutil', 'utils');