title: Convert series of numbers to date in R
body: <p>I have a .xlsx file that I read onto R. This file has one of the columns in date format (d/m/y) but for some reason it's displaying as series of numbers in the data frame on RStudio.</p>
  
  <p>My question is how do I change the column to the original date format?
  Here's an example of the date that's showing: <code>887587200</code> - instead of something like <code>12/03/1974</code>.</p>
  
  <p>Any help to fix this would be appreciated.
  Thanks</p>