title: Convert time from numeric to time format in R
body: <p>I read data from an xls file. Apparently, the time is not in the right format. It is as follows (for example)</p>
  
  <pre><code>0.3840277777777778
  0.3847222222222222
  0.3854166666666667
  </code></pre>
  
  <p>Indeed, they should be</p>
  
  <pre><code>09:12
  09:13
  09:13
  </code></pre>
  
  <p>I don't know how to convert it to the right format. I searched several threads and all of them are about converting the date (with/without time) to the right format. </p>
  
  <p>Can somebody give me any clues?</p>