diff --git a/scheduler.admin.inc b/scheduler.admin.inc
index 6b9b780..e6eb4bc 100644
--- a/scheduler.admin.inc
+++ b/scheduler.admin.inc
@@ -7,8 +7,6 @@
 
 use Drupal\Component\Utility\String;
 use Drupal\Core\Form\FormStateInterface;
-use Drupal\Core\Session\AccountInterface;
-use Drupal\Core\Url;
 
 /**
  * Helper function for the real hook_form_node_type_form_alter().
@@ -233,60 +231,6 @@ function _scheduler_generate_key(array $form, FormStateInterface $form_state) {
 }
 
 /**
- * Page callback: Generate the timecheck admin page.
- */
-function _scheduler_timecheck() {
-  return theme('scheduler_timecheck', array('now' => REQUEST_TIME));
-}
-
-/**
- * Returns HTML the timecheck administration page.
- *
- * @param array $variables
- *   An associative array containing:
- *   - 'now': A UNIX timestamp to format.
- *
- * @ingroup themeable
- */
-function theme_scheduler_timecheck($variables) {
-  $account = \Drupal::currentUser();
-
-  $now = $variables['now'];
-  $date_default_timezone = variable_get('date_default_timezone', date_default_timezone_get());
-
-  $t_options = array(
-    // For @utc specify 'GMT' as the timezone (4th parameter) so that no
-    // timezone offset is returned.
-    '@utc' => format_date($now, 'custom', 'jS F Y, H:i:s P', 'GMT'),
-    // For @localtime do not specify any timezone parameter so that the user or
-    // site default setting is returned.
-    '@localtime' => format_date($now, 'custom', 'jS F Y, H:i:s P T e'),
-    '@daylight_saving' => format_date($now, 'custom', 'I') ? t('currently in daylight saving mode') : t('not in daylight saving mode'),
-    '@user_account' => Url::fromRoute('entity.user.edit_form', array('user' => $account->id())),
-    '@date_default_timezone' => String::checkPlain($date_default_timezone),
-    '@date_default_offset' => format_date($now, 'custom', 'P', $date_default_timezone),
-    '@date_default_code' => format_date($now, 'custom', 'T', $date_default_timezone),
-    '@admin_regional_settings' => Url::fromRoute('system.regional_settings'),
-  );
-
-  $output = '<h4>' . t('Time check') . '</h4>'
-    . '<p>' . t('Your server\'s time is @utc. In most cases this should match <a href="https://www.google.com/search?q=Greenwich%20Mean%20Time">Greenwich Mean Time (GMT) / Coordinated Universal Time (UTC)</a>', $t_options) . '</p>'
-    . '<p>' . t('The website default timezone is @date_default_timezone (@date_default_code) which is offset from GMT by @date_default_offset hours. This timezone can be <a href="@admin_regional_settings">changed by admin users</a> with the appropriate access.', $t_options) . '</p>';
-
-  if (variable_get('configurable_timezones', 1)) {
-    $output .= '<p>' . t('Your local time is @localtime (@daylight_saving). You can change this via your <a href="@user_account">user account</a>.', $t_options) . '</p>';
-    if (!$account->getTimezone()) {
-      $output .= '<p>' . t('Note: The user timezone has not been stored, so defaulting to the website timezone.') . '</p>';
-    }
-  }
-  else {
-    $output .= '<p>' . t('Your local time is @localtime (@daylight_saving). This is not configurable by you.', $t_options) . '</p>';
-  }
-
-  return $output;
-}
-
-/**
  * Page callback: Displays a list of nodes scheduled for (un)publication.
  *
  * This will appear as a tab on the content admin page ('admin/content'). It is
diff --git a/scheduler.install b/scheduler.install
index ec01632..25e9422 100644
--- a/scheduler.install
+++ b/scheduler.install
@@ -6,6 +6,65 @@
  */
 
 /**
+ * Implements hook_requirements().
+ */
+function scheduler_requirements($phase) {
+  $requirements = array();
+
+  // Report server internal clock.
+  if ($phase === 'runtime') {
+    $user = \Drupal::currentUser();
+
+    $now = REQUEST_TIME;
+    $system_date = \Drupal::config('system.date');
+    $date_default_timezone = $system_date->get('timezone.default') ?: date_default_timezone_get();
+    $date_formatter = \Drupal::service('date.formatter');
+
+    $t_options = array(
+      // For %utc specify 'GMT' as the timezone (4th parameter) so that no
+      // timezone offset is returned.
+      '%utc' => $date_formatter->format($now, 'custom', 'jS F Y, H:i:s P', 'GMT'),
+      // For %localtime do not specify any timezone parameter so that the user or
+      // site default setting is returned.
+      '%localtime' => $date_formatter->format($now, 'custom', 'jS F Y, H:i:s P T e'),
+      '%daylight_saving' => $date_formatter->format($now, 'custom', 'I') ? t('currently in daylight saving mode') : t('not in daylight saving mode'),
+      '%date_default_timezone' => $date_default_timezone,
+      '%date_default_offset' => $date_formatter->format($now, 'custom', 'P', $date_default_timezone),
+      '%date_default_code' => $date_formatter->format($now, 'custom', 'T', $date_default_timezone),
+      '!account_edit' => \Drupal::url('entity.user.edit_form', ['user' => $user->id()]),
+      '!admin_regional_settings' => \Drupal::url('system.regional_settings'),
+      '!link_gmt' => 'https://www.google.com/search?q=Greenwich%20Mean%20Time',
+    );
+
+    $description = '';
+    $description .= t('Your server\'s time is %utc. In most cases this should match <a href="!link_gmt">Greenwich Mean Time (GMT) / Coordinated Universal Time (UTC)</a>', $t_options);
+    $description .= '<br />' . t('The website default timezone is %date_default_timezone (%date_default_code) which is offset from GMT by %date_default_offset hours. This timezone can be <a href="!admin_regional_settings">changed by admin users</a> with the appropriate access.', $t_options);
+
+    if ($system_date->get('timezone.user.configurable')) {
+      $description .= '<br />' . t('Your local time is %localtime (%daylight_saving). You can change this via your <a href="!account_edit">user account</a>.', $t_options);
+      if (!$user->getTimezone()) {
+        $description .= '<br />' . t('Note: The user timezone has not been stored, so defaulting to the website timezone.');
+      }
+    }
+    else {
+      $description .= '<br />' . t('Your local time is %localtime (%daylight_saving). This is not configurable by you.', $t_options);
+    }
+
+    $requirements['scheduler_timecheck'] = array(
+      'title' => t('Time Check'),
+      'value' => t('%utc', $t_options),
+      'description' => array(
+        '#type' => 'inline_template',
+        '#template' => '{{ description|raw }}',
+        '#context' => array('description' => $description),
+      ),
+    );
+  }
+
+  return $requirements;
+}
+
+/**
  * Implements hook_schema().
  */
 function scheduler_schema() {
diff --git a/scheduler.module b/scheduler.module
index dc4e966..b402158 100644
--- a/scheduler.module
+++ b/scheduler.module
@@ -65,15 +65,6 @@ function scheduler_menu() {
     'weight' => 10,
     'file' => 'scheduler.admin.inc',
   );
-  $items['admin/config/content/scheduler/timecheck'] = array(
-    'title' => 'Time Check',
-    'description' => 'Allows site admin to check their servers internal clock',
-    'page callback' => '_scheduler_timecheck',
-    'access arguments' => array('administer scheduler'),
-    'type' => MENU_LOCAL_TASK,
-    'weight' => 15,
-    'file' => 'scheduler.admin.inc',
-  );
   $items['admin/content/scheduler'] = array(
     'title' => 'Scheduled',
     'page callback' => 'scheduler_list',
@@ -666,17 +657,6 @@ function _scheduler_scheduler_api(NodeInterface $node, $action) {
 }
 
 /**
- * Implements hook_theme().
- */
-function scheduler_theme() {
-  return array(
-    'scheduler_timecheck' => array(
-      'arguments' => array('now' => NULL),
-    ),
-  );
-}
-
-/**
  * Implements hook_views_api().
  */
 function scheduler_views_api() {