diff --git a/.travis/phpunit.travis.xml b/.travis/phpunit.travis.xml
index a7c27627..30741227 100644
--- a/.travis/phpunit.travis.xml
+++ b/.travis/phpunit.travis.xml
@@ -22,7 +22,7 @@
         <listener class="NunoMaduro\Collision\Adapters\Phpunit\Listener"/>
     </listeners>
     <php>
-        <env name="APP_ENV" value="test"/>
+        <env name="APP_ENV" value="unittest"/>
         <env name="APP_KEY" value="base64:ve66Z5Kt/zTN3p++0zOPu854PHfZkwJE5VuoFAlzHtI="/>
         <env name="APP_DEBUG" value="true"/>
         <env name="APP_LOG_LEVEL" value="debug"/>
diff --git a/app/Contracts/Metar.php b/app/Contracts/Metar.php
index a06c2f7d..d5a205cb 100644
--- a/app/Contracts/Metar.php
+++ b/app/Contracts/Metar.php
@@ -2,8 +2,9 @@
 
 namespace App\Contracts;
 
-use Cache;
-use Log;
+use GuzzleHttp\Exception\GuzzleException;
+use Illuminate\Support\Facades\Cache;
+use Illuminate\Support\Facades\Log;
 
 /**
  * Base class for implementing retrieving METARs
@@ -43,7 +44,7 @@ abstract class Metar
         $raw_metar = Cache::remember($key, $cache['time'], function () use ($icao) {
             try {
                 return $this->metar($icao);
-            } catch (\GuzzleHttp\Exception\GuzzleException $e) {
+            } catch (GuzzleException $e) {
                 Log::error('Error getting METAR: '.$e->getMessage(), $e->getTrace());
                 return '';
             } catch (\Exception $e) {
diff --git a/app/Support/Dates.php b/app/Support/Dates.php
index c404c0ad..a97cc457 100644
--- a/app/Support/Dates.php
+++ b/app/Support/Dates.php
@@ -38,11 +38,27 @@ class Dates
     public static function getMonthBoundary($month): array
     {
         [$year, $month] = explode('-', $month);
-        $days = \cal_days_in_month(CAL_GREGORIAN, $month, $year);
+        $days = static::getDaysInMonth($month, $year);
 
         return [
             "$year-$month-01",
             "$year-$month-$days",
         ];
     }
+
+    /**
+     * Get the number of days in a month
+     * https://www.php.net/manual/en/function.cal-days-in-month.php#38666
+     *
+     * @param int $month
+     * @param int $year
+     *
+     * @return int
+     */
+    public static function getDaysInMonth($month, $year): int
+    {
+        $month = (int) $month;
+        $year = (int) $year;
+        return $month == 2 ? ($year % 4 ? 28 : ($year % 100 ? 29 : ($year % 400 ? 28 : 29))) : (($month - 1) % 7 % 2 ? 30 : 31);
+    }
 }
diff --git a/composer.json b/composer.json
index f1d006e0..bb125dcf 100755
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,6 @@
     "homepage": "http://www.phpvms.net",
     "require": {
         "php": ">=7.2",
-        "ext-calendar": "*",
         "ext-json": "*",
         "ext-mbstring": "*",
         "ext-simplexml": "*",
diff --git a/modules/Installer/Config/config.php b/modules/Installer/Config/config.php
index ef299cf6..637f4527 100644
--- a/modules/Installer/Config/config.php
+++ b/modules/Installer/Config/config.php
@@ -15,7 +15,6 @@ return [
     ],
 
     'extensions' => [
-        'calendar',
         'openssl',
         'pdo',
         'mbstring',