核心数据。按日期筛选

我在核心数据中有一个.xcdatamodel,其中包含实体内容和属性dateCreated类型Date和text1类型String。

//CREATE
   func createData() {
       guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
       let managedContext = appDelegate.persistentContainer.viewContext
       let contentEntity = NSEntityDescription.entity(forEntityName: "Content", in: managedContext)!

       let content = NSManagedObject(entity: contentEntity, insertInto: managedContext)
       content.setValue(Date(), forKey: "dateCreated")
       content.setValue("someText", forKey: "text1")

       do {
           try managedContext.save()
       } catch let error as NSError {
           print("Could not save. \(error), \(error.userInfo)")
       }
    }

//READ
    func readData() {
           guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
           let managedContext = appDelegate.persistentContainer.viewContext
           let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Content")
           fetchRequest.predicate = NSPredicate(format: "text1 = %@", "some text")

           do {
               let result = try managedContext.fetch(fetchRequest)

               for data in result as! [NSManagedObject] {
                   print(data.value(forKey: "dateCreated") as! Date)
                   print(data.value(forKey: "text1") as! String)
               }
           } catch {
               print("Failed")
           }
       }

如果我打印dateCreated,它会给出:2020-03-12 10:20:42+0000 我的问题是:我如何阅读和过滤日期?只有日期,没有时间。例如2020-03-12或任何其他没有时间的日期:

fetchRequest.predicate = NSPredicate(format: "dateCreated = %@", ?????)