Python 需要以历元格式获取日期范围

需要以历元格式获取当前月份的范围（从开始到月底，两个变量，以毫秒为单位的历元格式）。怎么做？也许有人已经这样做了，并且可以提供帮助？

来自熊猫文档：。将datetime转换为int64，然后除以转换单位

import pandas as pd

def to_epoch(**kwargs):
    """returns: NumPy ndarray."""
    stamps = pd.date_range(**kwargs)
    return stamps.view('int64') // pd.Timedelta(1, unit='s')

to_epoch(start='2017-04-01', end='2017-04-30')
array([1491004800, 1491091200, 1491177600, 1491264000, 1491350400,
       1491436800, 1491523200, 1491609600, 1491696000, 1491782400,
       1491868800, 1491955200, 1492041600, 1492128000, 1492214400,
       1492300800, 1492387200, 1492473600, 1492560000, 1492646400,
       1492732800, 1492819200, 1492905600, 1492992000, 1493078400,
       1493164800, 1493251200, 1493337600, 1493424000, 1493510400])

---

不是熊猫，但一般来说：

from datetime import datetime
import calendar

epoch = datetime.utcfromtimestamp(0)

def unix_time(dt):
    return (dt - epoch).total_seconds() * 1000.0


today = datetime.now()
lastDay = calendar.monthrange(today.year, today.month)[1]

firstDayOfMonth = today.replace(day=1)
lastDayofMonth = today.replace(day=lastDay)

firstEpoch = unix_time(firstDayOfMonth)
lastEpoch = unix_time(lastDayOfMonth)

或：