diff --git a/src/application/controllers/Backend_api.php b/src/application/controllers/Backend_api.php
index fb5abeff..2f5ae866 100644
--- a/src/application/controllers/Backend_api.php
+++ b/src/application/controllers/Backend_api.php
@@ -199,12 +199,16 @@ class Backend_api extends CI_Controller {
             }
 
             // Get appointments
-            $where_clause = [
-                $where_id => $this->input->post('record_id'),
-                'DATE(start_datetime) >=' => $this->input->post('start_date'),
-                'DATE(start_datetime) <=' => date('Y-m-d', strtotime($this->input->post('end_date') . ' +1 day')),
-                'is_unavailable' => FALSE
-            ];
+            $record_id = $this->db->escape($_POST['record_id']);
+            $start_date = $this->db->escape($_POST['start_date']);
+            $end_date = $this->db->escape(date('Y-m-d', strtotime($_POST['end_date'] . ' +1 day')));
+
+            $where_clause = $where_id . ' = ' . $record_id . '
+                AND ((start_datetime > ' . $start_date . ' AND start_datetime < ' . $end_date . ') 
+                or (end_datetime > ' . $start_date . ' AND end_datetime < ' . $end_date . ') 
+                or (start_datetime <= ' . $start_date . ' AND end_datetime >= ' . $end_date . ')) 
+                AND is_unavailable = 0
+            ';
 
             $response['appointments'] = $this->appointments_model->get_batch($where_clause);
 
@@ -218,12 +222,12 @@ class Backend_api extends CI_Controller {
             // Get unavailable periods (only for provider).
             if ($this->input->post('filter_type') == FILTER_TYPE_PROVIDER)
             {
-                $where_clause = [
-                    $where_id => $this->input->post('record_id'),
-                    'DATE(start_datetime) >=' => $this->input->post('start_date'),
-                    'DATE(start_datetime) <=' => date('Y-m-d', strtotime($this->input->post('end_date') . ' +1 day')),
-                    'is_unavailable' => TRUE
-                ];
+                $where_clause = $where_id . ' = ' . $record_id . '
+                    AND ((start_datetime > ' . $start_date . ' AND start_datetime < ' . $end_date . ') 
+                    or (end_datetime > ' . $start_date . ' AND end_datetime < ' . $end_date . ') 
+                    or (start_datetime <= ' . $start_date . ' AND end_datetime >= ' . $end_date . ')) 
+                    AND is_unavailable = 1
+                ';
 
                 $response['unavailables'] = $this->appointments_model->get_batch($where_clause);
             }