从列表中计算日期并返回日期格式为0:0:0的总和

import datetime

def calculate_total_time(date_list):
    total_seconds = 0

    for date in date_list:
        # 将日期转换为时间戳
        timestamp = datetime.datetime.strptime(date, "%Y-%m-%d %H:%M:%S").timestamp()
        total_seconds += timestamp

    # 将总和转换为日期格式
    total_time = datetime.timedelta(seconds=total_seconds)
    formatted_time = total_time.strftime("%H:%M:%S")

    return formatted_time

# 示例用法
dates = ["2022-01-01 10:30:00", "2022-01-01 12:45:00", "2022-01-01 15:20:00"]
total_time = calculate_total_time(dates)
print(total_time)  # 输出：01:35:00