for p in patterns:
        pattern_counter = 0
        fail_counter = 0
        for s in expire_date:
            try:
                conv = datetime.strptime(s, p)
                formatted = conv.strftime(p)
                pattern_counter += 1
                # best_count +=1
                # best_count +=1
                # print(formatted ,p)
            except ValueError:
                fail_counter +=1
		 print('fail counter', fail_counter, ' pattern_counter ', pattern_counter)
        if pattern_counter > fail_counter:
            print(p)