diff --git a/oncall.php b/oncall.php
index 8faee7e..348ac15 100644
--- a/oncall.php
+++ b/oncall.php
@@ -4,12 +4,11 @@ declare(strict_types = 1);
 require_once 'vendor/autoload.php';
 
 use Yasumi\Holiday;
-
 /* On Call Ticket Notification Script */
 $oncall = new oncall();
 $oncall->dateAndTimeCheck();
 $oncall->retrieveItems();
-if (!$this->notify) {
+if (!$oncall->notify) {
   exit(0);
 }
 $oncall->setEmail();
@@ -71,7 +70,7 @@ class oncall {
    * A flag of whether Mattermost should be contacted.
    * @var bool
    */
-  private $notify;
+  public $notify;
 
   public function __construct() {
     // Load the .env file
@@ -107,7 +106,8 @@ class oncall {
     if ($td_min > 60) {
       $this->everyone = TRUE;
     }
-    if ($td_min < 3 || ($td_min >= 30 || $td_min < 33)) {
+    // Notify every 30 minutes.
+    if (($td_min % 30) < 3) {
       $this->notify = TRUE;
     }
     return $td_min;
@@ -201,7 +201,7 @@ class oncall {
 
   public function setEmail() {
     // path to file containing email of person on call
-    $contactfile = './contact.txt';
+    $contactfile = __DIR__ . "/contact.txt";
     // set the email of the person on call
     $this->email = trim(file_get_contents("$contactfile"));
   }
@@ -210,7 +210,7 @@ class oncall {
    * Checks whether we're responsible for on-call on this date and time.
    */
   public function dateAndTimeCheck() {
-    $today = new DateTime();
+    $today = new DateTime("now", new DateTimeZone('America/New_York'));
     $thisYear = (int) $today->format('Y');
     $thisHour = (int) $today->format('H');