title: Subtract two days and calculate working days only (no Saturdays or Sundays)
body: <p>I am looking for an external JAR or a method that will supply me the following abilities: </p>
  
  <ol>
  <li>Subtract two dates.</li>
  <li>Define holidays as Saturday and Sunday, or Friday and Saturday.</li>
  <li>Calculate the difference with holidays or without them.</li>
  </ol>
  
  <p>Can anyone recommend an external JAR before I go into Gregorian calendar calculations?</p>