title: excel year() formula returns incorrect year
body: <p>For some reason the Excel year() formula does not return <b>2008</b> as expected!</p>
  
  <p>I am using Excel 2016 (offline version)</p>
  
  <pre><code>Row    C              D                     Formula
  1      SourceDate     YearOnly
  2      2008/12/01     1905/06/30            =YEAR(C2)
  </code></pre>