format date

src/app/bc-info/purchase/purchase.component.html

@@ -1,7 +1,7 @@
 <div class="card">
 
     <div class="card-header">
-        <small>{{timestamp}}</small>
+        <small>{{timestamp | date:"dd.MM.yyyy hh:mm:ss"}}</small>
         <span style="float: right;">                            
             <button style="margin-right: 5px" class="btn btn-secondary btn-sm" (click)="onRequestData()">
                 Data