如何根据日期对FASTA文件进行排序？

import os
import datetime

def get_creation_date(file_path):
    # 获取文件的创建日期
    creation_time = os.path.getctime(file_path)
    return datetime.datetime.fromtimestamp(creation_time)

def parse_fasta(file_path):
    # 解析FASTA文件，提取序列和日期信息
    sequences = []
    dates = []
    with open(file_path, 'r') as file:
        sequence = ''
        for line in file:
            if line.startswith('>'):
                if sequence:
                    sequences.append(sequence)
                sequence = ''
                dates.append(line.strip()[1:])
            else:
                sequence += line.strip()
        if sequence:
            sequences.append(sequence)
    return sequences, dates

def sort_fasta_by_date(file_path):
    # 根据日期对FASTA文件进行排序
    sequences, dates = parse_fasta(file_path)
    sorted_indices = sorted(range(len(dates)), key=lambda x: datetime.datetime.strptime(dates[x], '%Y-%m-%d'))
    sorted_sequences = [sequences[i] for i in sorted_indices]
    sorted_dates = [dates[i] for i in sorted_indices]

    # 将排序后的序列写入新的FASTA文件
    with open('sorted.fasta', 'w') as file:
        for sequence, date in zip(sorted_sequences, sorted_dates):
            file.write(f'>{date}\n')
            file.write(f'{sequence}\n')

# 示例用法
file_path = 'example.fasta'
sort_fasta_by_date(file_path)