如何在不使用库的情况下在python中按自定义月份增加日期时间

import datetime

import datetime

def add_months(date, months):
    year = date.year + (date.month + months - 1) // 12
    month = (date.month + months - 1) % 12 + 1
    day = min(date.day, (date.replace(year=year, month=month, day=1) - datetime.timedelta(days=1)).day)
    return date.replace(year=year, month=month, day=day)

# 测试代码
date = datetime.datetime(2022, 1, 31)  # 初始日期为2022年1月31日
months_to_add = 13  # 增加13个月

new_date = add_months(date, months_to_add)
print(new_date)

2023-02-28 00:00:00