将微秒时间戳转换为Python中的datetime [英] Convert microsecond timestamp to datetime in Python

问题描述

我正在从Chrome浏览器提取cookie过期日期。从外观上看，Chrome正在将Cookie到期时间戳记以1601-01-01 00:00:00 UTC作为纪元。我当前的实现如下：

  stamp = int（result [3]）
 date = datetime.datetime。 fromtimestamp（stamp / 10000000.0）
打印date.year 
  

但是，这是错误的日期（约一年）。我在这里做错了什么？

解决方案

另一个选项（也假设 pytz ，所以你有一个 tzinfo 实现）：

 >>> import pytz 
>>>>从datetime import datetime，timedelta 
>>> epoch = datetime（1601,1,1，tzinfo = pytz.UTC）
>>> cookie_microseconds_since_epoch = 13022344559000000 
>>> cookie_datetime = epoch + timedelta（microseconds = cookie_microseconds_since_epoch）
>>> str（cookie_datetime）
'2013-08-29 13：55：59 + 00：00'
  

更新：

正如@JFSebastian正确指出的，如果您只使用隐含的UTC天真 datetime 对象，则使用 pytz 是多余的，上述可以简化为：

 >>>从datetime import datetime，timedelta 
>>> epoch = datetime（1601,1,1）
>>>> cookie_microseconds_since_epoch = 13022344559000000 
>>> cookie_datetime = epoch + timedelta（microseconds = cookie_microseconds_since_epoch）
>>> str（cookie_datetime）
'2013-08-30 13:55:59'
  

I'm pulling a cookie expiration date from Google Chrome. From what it looks like, Chrome is storing cookie expirations with a timestamp that uses 1601-01-01 00:00:00 UTC as the epoch. My current implementation is as follows:

stamp = int(result[3])
date = datetime.datetime.fromtimestamp(stamp / 10000000.0)
print date.year

However, this is producing the wrong date (off by about a year). What am I doing wrong here?

解决方案

Another option (also assuming pytz is installed so you have a tzinfo implementation):

>>> import pytz
>>> from datetime import datetime, timedelta
>>> epoch = datetime(1601, 1, 1, tzinfo=pytz.UTC)
>>> cookie_microseconds_since_epoch = 13022344559000000
>>> cookie_datetime = epoch + timedelta(microseconds=cookie_microseconds_since_epoch)
>>> str(cookie_datetime)
'2013-08-29 13:55:59+00:00'

I assume that the difference to your expected value is the timezones offset.

Update:

As @J.F.Sebastian correctly points out, if you are using only implicit UTC naive datetime objects, using pytz is redundant and the above can be simplified to:

>>> from datetime import datetime, timedelta
>>> epoch = datetime(1601, 1, 1)
>>> cookie_microseconds_since_epoch = 13022344559000000
>>> cookie_datetime = epoch + timedelta(microseconds=cookie_microseconds_since_epoch)
>>> str(cookie_datetime)
'2013-08-30 13:55:59'

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