一天之后添加'nd'，'st'，'rd'

Question

  

可能重复：
  Ordinal Month-day Suffix Option for NSDateFormatter setDateFormat

我正在尝试显示Tues, Jan 24th 2012的日期。任何人都知道如何让th nd，st，rd出现？

NSDate *currDate = [NSDate date];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
    dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en-US"];
    [dateFormatter setDateFormat:@"E, MMM dd, YYYY"];
    longDate = [dateFormatter stringFromDate:currDate];
    NSLog(@"%@",longDate);

将显示Tue, Jan 24, 2012