在Python中使用pytz本地化时代时间 [英] Localizing Epoch Time with pytz in Python

问题描述

我正在使用pytz将纪元时间戳转换为不同时区中的日期。我正在尝试做的是创建一个DateTime对象，该对象接受Olson数据库时区和一个纪元时间并返回本地化的datetime对象。最终，我需要回答诸如在新纪元1350663248的纽约几点钟了？之类的问题。

Im working on converting epoch timestamps to dates in different timezones with pytz. What I am trying to do is create a DateTime object that accepts an Olson database timezone and an epoch time and returns a localized datetime object. Eventually I need to answer questions like "What hour was it in New York at epoch time 1350663248?"

此处某些内容无法正常工作：

Something is not working correctly here:

import datetime, pytz, time

class DateTime:
    def __init__(self, timezone, epoch):
        self.timezone = timezone
        self.epoch = epoch
        timezoneobject = pytz.timezone(timezone)
        datetimeobject = datetime.datetime.fromtimestamp( self.epoch )
        self.datetime = timezoneobject.localize(datetimeobject)

    def hour(self):
        return self.datetime.hour

if __name__=='__main__':
    epoch = time.time()
    dt = DateTime('America/Los_Angeles',epoch)
    print dt.datetime.hour
    dt = DateTime('America/New_York',epoch)
    print dt.datetime.hour

此命令打印同一小时，而提前3个小时左右。怎么了我是Python的新手，非常感谢！

This prints the same hour, whereas one should be 3 or so hours ahead. Whats going wrong here? I'm a total Python beginner, any help is appreciated!

推荐答案

datetime.fromtimestamp（self。 返回不应与任意时区一起使用的本地时间。您需要 utcfromtimestamp（）来获取UTC中的日期时间，然后将其转换为所需的时区：

datetime.fromtimestamp(self.epoch) returns localtime that shouldn't be used with an arbitrary timezone.localize(); you need utcfromtimestamp() to get datetime in UTC and then convert it to a desired timezone:

from datetime import datetime
import pytz

# get time in UTC
utc_dt = datetime.utcfromtimestamp(posix_timestamp).replace(tzinfo=pytz.utc)

# convert it to tz
tz = pytz.timezone('America/New_York')
dt = utc_dt.astimezone(tz)

# print it
print(dt.strftime('%Y-%m-%d %H:%M:%S %Z%z'))

或更简单的选择是直接从时间戳构造：

Or a simpler alternative is to construct from the timestamp directly:

from datetime import datetime
import pytz

# get time in tz
tz = pytz.timezone('America/New_York')
dt = datetime.fromtimestamp(posix_timestamp, tz)
# print it
print(dt.strftime('%Y-%m-%d %H:%M:%S %Z%z'))

在这种情况下，它是从UTC隐式转换的。

It converts from UTC implicitly in this case.

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