Python - 在特定时区设置日期时间（无UTC转换） [英] Python - Setting a datetime in a specific timezone (without UTC conversions)

问题描述

要清楚，这是python 2.6，我使用pytz。

Just to be clear, this is python 2.6, I am using pytz.

这是一个仅处理美国时区的应用程序，我需要能够锚定一个日期（今天），并获得一个unix时间戳（时代）晚上8点和晚上11点，只有PST。

This is for an application that only deals with US timezones, I need to be able to anchor a date (today), and get a unix timestamp (epoch time) for 8pm and 11pm in PST only.

这让我很疯狂。

> pacific = pytz.timezone("US/Pacific")

> datetime(2011,2,11,20,0,0,0,pacific)

datetime.datetime(2011, 2, 11, 20, 0, tzinfo=<DstTzInfo 'US/Pacific' PST-1 day, 16:00:0 STD>)

> datetime(2011,2,11,20,0,0,0,pacific).strftime("%s")
'1297454400'

zsh> date -d '@1297454400'    
Fri Feb 11 12:00:00 PST 2011

所以，即使我正在设置一个时区，并且使用这个时区创建datetime ，它仍然是以UTC形式创建的，然后进行转换。这是一个更多的问题，因为当我尝试进行计算时，UTC将是一天。

So, even though I am setting up a timezone, and creating the datetime with that time zone, it is still creating it as UTC and then converting it. This is more of a problem since UTC will be a day ahead when I am trying to do the calculations.

是否有一个简单（或至少是感性的）生成方式今天晚上8点PST的时间戳记？

Is there an easy (or at least sensical) way to generate a timestamp for 8pm PST today?

（要清楚的是，我明白了在大多数情况下使用UTC的价值，如数据库时间戳或一般存储，不是这些情况之一，我特别需要PST的晚上时间戳，UTC不应该输入。）

(to be clear, I do understand the value of using UTC in most situations, like database timestamps, or for general storage. This is not one of those situations, I specifically need a timestamp for evening in PST, and UTC should not have to enter into it.)

推荐答案

p>为UTC时区创建一个tzinfo对象 utc ，然后尝试：

Create a tzinfo object utc for the UTC time zone, then try this:

#XXX: WRONG (for any timezone with a non-fixed utc offset), DON'T DO IT
datetime(2011,2,11,20,0,0,0,pacific).astimezone(utc).strftime("%s")

编辑：在评论中指出，将时区放入 datetime 构造函数并不总是强大的。使用 pytz文档的首选方法是：

As pointed out in the comments, putting the timezone into the datetime constructor isn't always robust. The preferred method using the pytz documentation would be:

#XXX: WRONG (unless your local timezone is UTC), DON'T DO IT
pacific.localize(datetime(2011,2,11,20,0,0,0)).astimezone(utc).strftime("%s")

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