pytz 和 astimezone() 不能应用于天真的日期时间

2022-01-16 00:00:00 python datetime timezone pytz

问题描述

我有一个日期，我需要让它知道时区.

I have a date and I need to make it time zone aware.

local_tz = timezone('Asia/Tokyo')
start_date = '2012-09-27'
start_date = datetime.strptime(start_date, "%Y-%m-%d")   
start_date = start_date.astimezone(local_tz)


now_utc = datetime.now(timezone('UTC'))
local_now = now_utc.astimezone(local_tz)

我需要看看这是不是真的:

I need to find if this is true:

print start_date>local_now

但我收到此错误.

   start_date = start_date.astimezone(local_tz)
   ValueError: astimezone() cannot be applied to a naive datetime

我将 UTC 转换为东京没有问题.我需要在东京制作 start_date 时区感知广告.

I convert utc to tokyo with no issue. I need to make start_date timezone aware ad well in tokyo.

谢谢

解决方案

对于 pytz 时区，使用他们的 .localize() 方法来转换一个幼稚的 datetime 对象与时区合二为一:

For pytz timezones, use their .localize() method to turn a naive datetime object into one with a timezone:

start_date = local_tz.localize(start_date)

对于没有 DST 转换的时区，.replace()将时区附加到天真的 datetime 对象的方法 通常也可以工作:

For timezones without a DST transition, the .replace() method to attach a timezone to a naive datetime object should normally also work:

start_date = start_date.replace(tzinfo=local_tz)

有关详细信息，请参阅 pytz 文档的本地化时间和日期算术.

See the localized times and date arithmetic of the pytz documentation for more details.

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