add pickups

lib/vo/pickup.dart

@@ -8,6 +8,7 @@ class PickUp {
   int weight;
   String address;
   String status;
+  DateTime date;
 
   PickUp(
       {this.id,
@@ -18,7 +19,10 @@ class PickUp {
       this.numberOfPackage,
       this.weight,
       this.address,
-      this.status});
+      this.status,
+      this.date});
+
+  int get last => DateTime.now().difference(date).inDays;
 
   factory PickUp.fromMap(Map<String, dynamic> map, String id) {
     return PickUp(