show 1st, 2nd, 3rd, 4th... day format

Utility.m

#import <Foundation/Foundation.h>

@interface Utlity : NSObject

+ (NSString *)formatDaySuffixForDate:(NSDate *)date;
+ (NSString *)formatDayWithSuffixForDate:(NSDate *)date withWeekday:(BOOL)showWeekday;

@end

@implementation Utlity

+ (NSString *)formatDaySuffixForDate:(NSDate *)date {
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSInteger dayOfMonth = [calendar component:NSCalendarUnitDay fromDate:date];
    NSString *result     = @"th";
    
    switch (dayOfMonth % 10) {
        case 1:
            result = @"st";
            break;
        case 2:
            result = @"nd";
            break;
        case 3:
            result = @"rd";
            break;
        default:
            result = @"th";
    }
    
    return [NSString stringWithFormat:@"%@%@", @(dayOfMonth), result];
}

+ (NSString *)formatDayWithSuffixForDate:(NSDate *)date withWeekday:(BOOL)showWeekday {
    NSString *day              = [Utility formatDaySuffixForDate:date];
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    formatter.dateFormat       = @"MMM";
    NSString *month            = [formatter stringFromDate:date];
    
    if (showWeekday) {
        formatter.dateFormat = @"EEE";
        NSString *weekday    = [formatter stringFromDate:date];
        
        // Mon 21st Jun
        return [NSString stringWithFormat:@"%@ %@ %@", weekday, day, month];
    }
    
    // 21st Jun
    return [NSString stringWithFormat:@"%@ %@", day, month];
}

@end