title: convert Excel decimal date time into time.Time
body: <p>While parsing an excel file in Golang, a date time column is getting read as <code>44531.553587963</code> which actually represents the time <code>12/01/2021 13:17:10</code>.</p>
  <p>How can I convert this decimal representation to <code>time.Time</code> object in go?</p>