diff --git hotel_booking/hotel_booking.util.inc hotel_booking/hotel_booking.util.inc
index 1640e93..5ede387 100644
--- hotel_booking/hotel_booking.util.inc
+++ hotel_booking/hotel_booking.util.inc
@@ -412,8 +412,8 @@ function hotel_booking_calculate_prices($check_in, $check_out, $rooms,
   }
   $dates = $results = array();
   //cache caldates
-  $start_date = new DateObject($check_in, date_default_timezone(), DATE_FORMAT_ISO);
-  $end_date = new DateObject($check_out, date_default_timezone(), DATE_FORMAT_ISO);
+  $start_date = new DateObject($check_in, date_default_timezone(), DATE_FORMAT_DATE);
+  $end_date = new DateObject($check_out, date_default_timezone(), DATE_FORMAT_DATETIME);
   $query = "SELECT r.calendar_dt, r.rate, hbrt.nid
             FROM {hotel_booking_room_types} hbrt
             INNER JOIN {node} n
@@ -611,4 +611,4 @@ function hotel_booking_auto_availability($node = NULL) {
     }
   }
 
-}
\ No newline at end of file
+}