Count Down Timer in iPhone
<p>I have two time.. one fetched directly as string(@"21:00") and other is the current time. I want to display a count down timer showing how much time left from now to reach 21:00.</p>

<p>For eg: the label i use should display "You have 3hrs and 30 minutes left.." if the current time is 17:30.
thanks..</p>
