title: Javascript convert short date number to javascript date
body: <p>I have a <code>.xlsx</code> file which has a table which contains dates. When I read the table in to javascript (with xlsx nodejs package) the dates are formatted as numbers. I would like to convert these numbers to dates. For example the number 43527 should be the date 13/03/2019. I have tried <code>new Date(43527*60*60*24*1000)</code> but this gives the wrong answer of <code>2089-03-04T00:00:00.000Z</code>.</p>