如何格式化两个时刻日期之间的差异

import datetime

def format_time_difference(start_time, end_time):
    start_timestamp = datetime.datetime.strptime(start_time, "%Y-%m-%d %H:%M:%S").timestamp()
    end_timestamp = datetime.datetime.strptime(end_time, "%Y-%m-%d %H:%M:%S").timestamp()
    time_difference = int(end_timestamp - start_timestamp)

    days = time_difference // (24 * 3600)
    time_difference = time_difference % (24 * 3600)
    hours = time_difference // 3600
    time_difference %= 3600
    minutes = time_difference // 60
    time_difference %= 60
    seconds = time_difference

    formatted_time_difference = f"{days}天 {hours}小时 {minutes}分钟 {seconds}秒"
    return formatted_time_difference

start_time = "2022-01-01 12:00:00"
end_time = "2022-01-02 14:30:15"
result = format_time_difference(start_time, end_time)
print(result)