为什么用history_bars_date取不到夜盘的数据啊？ - 高级功能研发区 - 金字塔客服中心 - 专业程序化交易软件提供商

为什么用history_bars_date取不到夜盘的数据啊？？？白天都正常的。现在只能得到白天的数据。
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代码：

dt1 = datetime.now()

context.zeropoint_time = datetime.strptime('20190823211500','%Y%m%d%H%M%S')

stardate = context.zeropoint_time - timedelta(days = 1)

enddate = dt1 + timedelta(days = 1)

myrec=history_bars_date(context.s1,stardate,enddate,context.run_info.frequency,fields=['datetime','open','close'],include_now=True)

print('end date is %s',enddate)

rec_count = len(myrec)

print('recorders len is %d',rec_count)

dt1,pr1,pr2 = myrec[rec_count-2][0], myrec[rec_count-2][1],myrec[rec_count-2][2]

print("pre datetime is %d, open is %f close is %f.",dt1,pr1,pr2)

dt1,pr1,pr2 = myrec[rec_count-1][0], myrec[rec_count-1][1],myrec[rec_count-1][2]

print("last datetime is %d, open is %f close is %f.",dt1,pr1,pr2)

消息窗口输出是：

22:02:10 > end date is 2019-09-21 22:02:10.007407

22:02:10 > recorders len is 452

22:02:10 > pre datetime is 20190920144500, open is 3389.000000 close is 3385.000000.

22:02:10 > last datetime is 20190920150000, open is 3385.000000 close is 3388.000000.

主题：为什么用history_bars_date取不到夜盘的数据啊？