NSDateFormat for 03AM

I know its simple but I cant just get it right. Have been staring at this long time. I have a string with 03AM but when I try to get date from it I cannot get it working. It gives me 1970-01-01 21:00:00 +0000. dont know why. Can anyone help out here :

    NSDateFormatter *dateFormat = [[[NSDateFormatter alloc] init] autorelease];
    [dateFormat setDateFormat:@"ha"];
    [dateFormat setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"] autorelease] ];
    NSDate *date1 = [dateFormat dateFromString:display];
    NSLog(@"Display 2开发者_Python百科 : %@", date1);

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[dateFormat setDateFormat:@"ha"];

Should be:

[dateFormat setDateFormat:@"hh a"];

See if that works ;)

ref: http://unicode.org/reports/tr35/tr35-6.html#Date_Format_Patterns

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To get AM/PM to display correctly you may have to set the locale to a special value. See this thread.