Why are my labels disappearing when executing this code?
<p>I'm just beginning in iOS development, and am trying to make a simple app that takes time input in EST and then outputs PST and CST. I've gotten the View Controller setup, but my function for actually displaying the times only makes my labels disappear. Here's that function's code.</p>

<pre><code>- (IBAction)buttonPress {
NSDateFormatter *date = [[NSDateFormatter alloc] init];
[date setDateFormat:@"hh:mm a"];
[date setDateStyle:NSDateFormatterNoStyle];
[date setTimeStyle:NSDateFormatterShortStyle];

NSDate *estTime = [date dateFromString:self.estText.text];
[date setDateFormat:@"hh:mm a zzz"];
self.pstText.text = [date stringFromDate:estTime];

[date setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"CST"]];

self.cstText.text = [date stringFromDate:estTime];
</code></pre>

<p>}</p>
