title: reading unsigned integer 64 bit from binary file
body: <p>I am struggling with importing data from a binary file into R.
  Among others, the data file contains a <em>64 bit unsigned integer value (little Endian)</em> which I need to read out.</p>
  
  <p>The value represents the number of seconds since 12:00 am, January 1, 1900 and is to be converted to a date and time value (e.g. YYMMDDhhmmss).</p>
  
  <p>As a beginner I have read about some packages (bit64, int64) but it seems they don't support unsigned integers or aren't maintained any longer.</p>
  
  <p>Can someone please help me?</p>