补全时间

app/Api/Controllers/PrescriptionController.php

@@ -58,12 +58,12 @@ public function prescriptionList(Request $request)
         // 时间段
         $start_time = $request->input('start_time');
         if ($start_time) {
-            $start_time = $start_time . ' 00:00:00';
+            $start_time = $start_time.' 00:00:00';
             $query->where('created_at', '>=', $start_time);
         }
         $end_time = $request->input('end_time');
         if ($end_time) {
-            $end_time = $end_time . ' 23:59:59';
+            $end_time = $end_time.' 23:59:59';
             $query->where('created_at', '<=', $end_time);
         }