具有相同时区但不同的utcoffset（）的Datetime对象

In my django application i'm confronting two datetime objects (self.dueDate is a date object):

在我的django应用程序中,我遇到了两个日期时间对象(self.dueDate是一个日期对象):

ref_time = timezone.localtime(timezone.now(), timezone.get_default_timezone() )
threshold = datetime.combine( self.dueDate, 
                               time(tzinfo=timezone.get_default_timezone())) 
           - timedelta(days = 1)

I'm constructing them to have the same timezone (which they have), but they end up having two different UTC offsets.

我正在构建它们以具有相同的时区(它们具有相同的时区),但它们最终具有两个不同的UTC偏移。

>>>print threshold, threshold.tzinfo
2015-03-13 12:08:00+00:50 Europe/Rome 
>>>print ref_time, ref_time.tzinfo
2015-03-13 12:48:29.372984+01:00 Europe/Rome

Why is this happening? How can it be that there are two different offsets for the same tz? (and why would that offest be 50 minutes?)

为什么会这样?对于相同的tz,有两种不同的偏移量怎么样? (为什么那会是50分钟?)

1 个解决方案

#1

A timezone may have different utc offsets at different times. time(tzinfo=tz) uses a default utc offset e.g., for the earliest date that is most likely is not what you want. See:

时区在不同时间可能具有不同的utc偏移。 time(tzinfo = tz)使用默认的utc偏移量,例如,对于最有可能不是您想要的最早日期。看到:

Datetime Timezone conversion using pytz

使用pytz的Datetime时区转换

datetime with pytz timezone. Different offset depending on how tzinfo is set

与pytz时区的datetime。不同的偏移量取决于tzinfo的设置方式

pytz localize vs datetime replace

pytz localize vs datetime replace

To get the current time in tz timezone as an aware datetime object:

要将tz timezone中的当前时间作为有意识的日期时间对象获取:

from datetime import datetime

ref_time = datetime.now(tz)

To get a midnight a day before self.dueDate as an aware datetime object:

要在self.dueDate作为知晓日期时间对象之前的一天午夜:

from datetime import time as datetime_time, timedelta
from django.utils import timezone

midnight_yesterday = datetime.combine(self.dueDate, datetime_time()) - timedelta(1)
threshold = timezone.make_aware(midnight_yesterday)

Note: threshold may be more/less than 24 hours ago, see How can I subtract a day from a python date?.

注意:阈值可能多于/少于24小时前,请参阅如何从python日期减去一天?

1 个解决方案

#1

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