回测日期设置不管用

在init函数中设置了回测起止时间，但在执行回测时，终端打印出来的日期却是

2024-09-09 09:30:00:hello world

请问是什么原因呀？

import pandas as pd
import numpy as np
import talib

def init(ContextInfo):
    ContextInfo.trade_code_list=['159941.SZ']
    ContextInfo.set_universe(ContextInfo.trade_code_list)

    ContextInfo.start = "2024-01-10 09:30:00"
    ContextInfo.end = "2024-01-20 09:30:00"

    ContextInfo.capital = 1000000




def handlebar(ContextInfo):
    d = ContextInfo.barpos
    date = timetag_to_datetime(ContextInfo.get_bar_timetag(d), "%Y-%m-%d %H:%M:%S")
    print(f"{date}:hello world")

    print("回测区间:", ContextInfo.start, "到", ContextInfo.end)
    print("第一条数据时间:", timetag_to_datetime(ContextInfo.get_bar_timetag(0), "%Y-%m-%d %H:%M:%S"))
    # print("最后一条数据时间:", timetag_to_datetime(ContextInfo.get_bar_timetag(ContextInfo.barcount-1), "%Y-%m-%d %H:%M:%S"))