gistfile1.txt

        // Block which determine whether two NSDates are on the same day
        BOOL(^areDatesSameDay)(NSDate *, NSDate *) = ^(NSDate *date1, NSDate *date2) {
            if (!date1 || !date2)
                return NO;
            
            NSDateComponents *day1 = [[NSCalendar currentCalendar] components:NSEraCalendarUnit|NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:date1];
            NSDateComponents *day2 = [[NSCalendar currentCalendar] components:NSEraCalendarUnit|NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:date2];
            
            if ([day1 day] == [day2 day] &&
                [day1 month] == [day2 month] &&
                [day1 year] == [day2 year] &&
                [day1 era] == [day2 era]) {
                return YES;
            }
            
            return NO;
        };