title: Determining Millisecond Time Intervals In Cocoa
body: <p>Just as background, I'm building an application in Cocoa.  This application existed originally in C++ in another environment.  I'd like to do as much as possible in Objective-C.</p>
  
  <p>My questions are:</p>
  
  <p>1)
  How do I compute, as an integer, the number of milliseconds between now and the previous time I remembered as now?</p>
  
  <p>2)
  When used in an objective-C program, including time.h, what are the units of </p>
  
  <p>clock()</p>
  
  <p>Thank you for your help.</p>