title: VLOOKUP is returning blank as 1/0/1990, rather than nothing visible
body: <p>All cells are formatted for dates, when a cell is blank I would like it to return an apparently blank cell rather than <code>1/0/1900</code>.  Here is what I have so far however It is still returning the date instead of a blank:</p>
  
  <pre><code>= IF(ISNA(VLOOKUP($B$4,TrainingDatabase!$A$3:$S$14,3,0))=  0,"", (VLOOKUP($B$4,TrainingDatabase!$A$3:$S$14,3,0)))
  </code></pre>