获取昨天的某个时刻

gistfile1.py

import datetime

yestoday = datetime.date.today() - datetime.timedelta(days=1)
print yestoday

yestoday_datetime = datetime.datetime.combine(yestoday, datetime.time.min)
print yestoday_datetime

yestoday_datetime = datetime.datetime.combine(yestoday, datetime.time())
print yestoday_datetime

the_time = yestoday_datetime + datetime.timedalta(hours=6)