diff --git a/.github/workflows/moodle-ci.yml b/.github/workflows/moodle-ci.yml
index a85790b..44cb94e 100644
--- a/.github/workflows/moodle-ci.yml
+++ b/.github/workflows/moodle-ci.yml
@@ -29,12 +29,12 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - php: '8.1'
-            moodle-branch: 'MOODLE_404_STABLE'
-            database: 'mariadb'
           # - php: '8.1'
-          #   moodle-branch: 'master'
-          #   database: 'pgsql'
+          #   moodle-branch: 'MOODLE_404_STABLE'
+          #   database: 'mariadb'
+          - php: '8.1'
+            moodle-branch: 'master'
+            database: 'pgsql'
     steps:
       - name: Checkout
         uses: actions/checkout@v3
diff --git a/lib.php b/lib.php
index 85efa33..4ee3b81 100644
--- a/lib.php
+++ b/lib.php
@@ -311,33 +311,45 @@ function update_availability(array $tabledata, \stdClass $driprelease) {
 
 
 /**
- * Get the date related availability for an activity
+ * Take an optional JSON string as input and return an array containing
+ * the date-related availability information.
+ * *
+ * If the input JSON is empty, the function returns an empty array.
  *
- * @param string $json
- * @return array
+ * Loop through each restriction in the JSON object and checks
+ * if the restriction type is "date". If true, it extracts the operator and
+ * timestamp from the restriction object.
+ *
+ * Based on the operator, the function updates the availability array with
+ * the formatted date string using userdate() function.
+ *
+ * The function returns the availability array containing the 'from' and 'to'
+ * dates in a human-readable format.
+ * @param string $json The optional JSON input string containing the availability restrictions
+ * @return array The availability array containing the 'from' and 'to' dates
  */
 function get_availability(?string $json): array {
-    global $USER;
     $availability = [];
-
-    if ($json > "" && $json <> '{}') {
-        $decoded = json_decode($json);
-        foreach ($decoded->c as $restriction) {
-            if (property_exists($restriction, 'type') && $restriction->type == "date") {
-                $operator = $restriction->d;
-                if ($operator == ">=") {
-                    $datetime = $restriction->t;
-                    $availability['from'] = userdate($datetime, '%a %d %b %Y %H:%M');
-                } else {
-                    $datetime = $restriction->t;
-                    $availability['to'] = userdate($datetime, '%a %d %b %Y %H:%M');
-                }
+    if (empty($json)) {
+        return $availability;
+    }
+    $decoded = json_decode($json);
+    foreach ($decoded->c as $restriction) {
+        if (property_exists($restriction, 'type') && $restriction->type == "date") {
+            $operator = $restriction->d;
+            if ($operator == ">=") {
+                $datetime = $restriction->t;
+                $availability['from'] = userdate($datetime, '%a %d %b %Y %H:%M');
+            } else {
+                $datetime = $restriction->t;
+                $availability['to'] = userdate($datetime, '%a %d %b %Y %H:%M');
             }
         }
     }
     return $availability;
 }
 
+
   /**
    * Calculate the dripping out of availability and format the dates for the session labels
    *
diff --git a/tests/driprelease_test.php b/tests/driprelease_test.php
index b49f1de..522427b 100644
--- a/tests/driprelease_test.php
+++ b/tests/driprelease_test.php
@@ -291,10 +291,10 @@ public function test_get_availability_with_dates(): void {
     public function test_get_availability_with_no_dates(): void {
         $this->resetAfterTest();
 
-        $json = '{}';
+        $json = "";
         $availability = get_availability($json);
 
-        // Assert the output
+        // Assert the output.
         $this->assertSame([], $availability);
     }
 
@@ -307,7 +307,7 @@ public function test_get_availability_with_null(): void {
 
         $availability = get_availability(null);
 
-        // Assert the output
+        // Assert the output.
         $this->assertSame([], $availability);
     }