title: Should I use Timer or Concurrency Service to change my ObservableObject of Date?
body: <p>I have an <code>ObservableValue</code> object of <code>LocalDate</code>:</p>
  
  <pre><code>private ObjectProperty&lt;LocalDate&gt; cal = new SimpleObjectProperty&lt;&gt;(this, "cal", LocalDate.now());
  </code></pre>
  
  <p>I want to change the value of <code>cal</code> object periodically to <code>LocalDate.now</code>. What is preferable for this: <code>Timer</code> or <code>Concurrency</code> ?</p>