如何获得今天开始的毫秒数?

import pandas as pd
import datetime
int(pd.to_datetime(datetime.datetime.now().date()).value / 1000000)
# Outputs: 1536451200000

我希望这样做能以毫秒为单位获得所需的日期开始时间 Python 3

from datetime import datetime

dt_obj = datetime.strptime('09.09.2019 00:00',
                           '%d.%m.%Y %H:%M')
millisec = dt_obj.timestamp() * 1000

print(millisec)

Output>> 1568001600000.0