如何将Python日期时间对象转换为时间戳而没有时间和时间倒退？

Question

I am making a timestamp out of a datetime object without minutes, seconds and so on:

import datetime
import time
import pytz
today_timestamp = datetime.datetime.now(pytz.timezone('Europe/Moscow')).replace(hour=0, minute=0,second=0, microsecond=0).timestamp()

And as a result I get:

1506546000.0

Then I am making a timestamp out of a string type object:

str_to_time = time.strptime('28.09.17', '%d.%m.%y')
time_to_timestamp = time.mktime(str_to_time)

And I get:

1506556800.0

I put the today's date in a string. Why these numbers are different?

Answer 1

time.strptime uses whatever timezone it inherited from the process that started the python process. Likely the timezone that was set when python was launched is not Europe/Moscow , but UTC . Did you have TZ=UTC set when launching the python interpreter?

today_timestamp = datetime.datetime.now(pytz.timezone('UTC')).replace(hour=0, minute=0,second=0, microsecond=0).timestamp()
1506556800.0