如何获取最新修改量的最早日期？

import datetime

# 假设数据源是一个包含日期字段的列表
data = [
    {'id': 1, 'date': '2022-01-01'},
    {'id': 2, 'date': '2022-01-03'},
    {'id': 3, 'date': '2022-01-02'},
    {'id': 4, 'date': '2022-01-01'}
]

latest_date = None
earliest_date = None

for item in data:
    date_str = item['date']
    date = datetime.datetime.strptime(date_str, '%Y-%m-%d').date()
    
    if latest_date is None or date > latest_date:
        latest_date = date
    
    if earliest_date is None or date < earliest_date:
        earliest_date = date

print("最新修改量的日期：", latest_date)
print("最早日期：", earliest_date)