python 获取前一天凌晨unix时间

# -*- coding:utf-8 -*-
import time

now_time = int(time.time())
day_time = now_time - now_time % 86400 + time.timezone
day_time_str = time.asctime(time.localtime(day_time))
print day_time
print day_time_str

import datetime
today = datetime.date.today()
today_time = int(time.mktime(today.timetuple()))
print today_time