title: How to sort NSMutableArray of date objects
body: <p>I'm doing some small work on sorting the date strings in the NSMutableArray, i'm getting the array from the sqlite db. 
  If you print the array it is showing like this</p>
  
  <p>date strings are (
      "2011-05-01",
      "2011-02-01",
      "2012-01-08",
      "2012-05-08",
      "2010-01-09
  )</p>
  
  <p>I want to show the dates in ascending order. Please help me out guys..... I'm newbie to objc..</p>