title: How convert decimal to time
body: <p>I'm working with php and try to convert decimal to time(hh : mm)
  but it does not work with any code and tested, the original string is from excel
  eg:</p>
  
  <pre><code>0.625 = 15:00
  0.53541666666667 = 12:51
  0.40277777777778 = 09:40
  </code></pre>