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How to add the format of abbreviations to date in iOS, for example. "th", "st"

I have the following code that formats my date and time in a string, for example:

Monday, October 25, 2013 - 14:56:34

NSDate *today = [[NSDate alloc] init];
dateFormatter = [[NSDateFormatter alloc] init];
[self.dateFormatter setDateFormat:@"EEEE, MMMM dd YYYY - HH:mm:ss"];

NSString *currentTime = [self.dateFormatter stringFromDate: today];
self.timerLabel.text = currentTime.uppercaseString;

It works well. But how do I put "th" or "rd" or "st" appropriately on a date, that is, after 25 in the above example?

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1 answer
NSDateFormatter *format = [[NSDateFormatter alloc] init];
[format setDateFormat:@"MMMM dd"];

NSDate *now = [[NSDate alloc] init];

NSString *dateString = [format stringFromDate:[now dateByAddingTimeInterval:(-60*60*24*10)]];
NSMutableString *tempDate = [[NSMutableString alloc]initWithString:dateString];
int day = [[tempDate substringFromIndex:[tempDate length]-2] intValue];
switch (day) {
    case 1:
    **case 21:
    case 31:**
        [tempDate appendString:@"st"];
        break;
    case 2:
    **case 22:**
        [tempDate appendString:@"nd"];
        break;
    case 3:
    **case 23:**
        [tempDate appendString:@"rd"];
        break;
    default:
        [tempDate appendString:@"th"];
        break;
}
NSLog(@"%@",tempDate);
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