title: Check if date exist in list of dates
body: <p>How can I compare only mounth and day (not year) from a list of dates?</p>
  
  <pre><code> DateTime[] dates= new DateTime[]
                  {
                      new DateTime(DateTime.Now.Year, 1, 1), 
                      new DateTime(DateTime.Now.Year, 5, 1), 
                      new DateTime(DateTime.Now.Year, 5, 8)
                  };
  // Result
  DateTime date_1 = new DateTime(2016, 1, 1); // OK
  DateTime date_2 = new DateTime(2022, 1, 1); // OK
  DateTime date_3 = new DateTime(2016, 1, 2); // KO
  DateTime date_4 = new DateTime(2016, 1, 3); // KO
  </code></pre>