title: Setting NSDate from NSString
body: <p>I am using XCode 4.2 to develop an iPhone App , I am new to App development </p>
  
  <p>I have the following NSStrings</p>
  
  <pre><code>NSString *year;
  NSString *month;
  NSString *day;
  NSString *hour;
  NSString *minute;
  </code></pre>
  
  <p>how can I set an <code>NSDate *date</code> variable using those</p>
  
  <p>Thanks</p>