Finished adding the simplest form of Menus.

imports/api/menuItems.js

@@ -83,5 +83,19 @@ Meteor.methods({
         }
 
         return MenuItems.remove({ _id: itemId });
+    },
+    'shiftDate' (itemId, momentAddDay) {
+        check(itemId, String);
+        check(momentAddDay, String);
+
+        if (!this.userId) {
+            throw new Meteor.Error('You are not allowed to shift menu item dates. Make sure you are logged in with valid user credentials.');
+        }
+
+        return MenuItems.update({ _id: itemId }, {
+            $set: {
+                serveDate: momentAddDay,
+            }
+        });
     }
 });