blocks|key|362359|text|默认情况下，datetime对象在Python语言中为naive，因此您需要将这两个对象都设置为朴素的或有意识的datetime对象。这可以使用以下命令来完成：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|362360|import+datetime
import+pytz

utc=pytz.UTC

challenge.datetime_start+=+utc.localize(challenge.datetime_start)+
challenge.datetime_end+=+utc.localize(challenge.datetime_end)+
#+now+both+the+datetime+objects+are+aware,+and+you+can+compare+them|code-block|syntax|javascript|362361|注意:如果已经设置了tzinfo，这将引发一个ValueError。如果您不确定这一点，只需使用|362362|start_time+=+challenge.datetime_start.replace(tzinfo=utc)
end_time+=+challenge.datetime_end.replace(tzinfo=utc)|362363|顺便说一句，您可以使用时区信息格式化datetime.datetime对象中的UNIX时间戳，如下所示|362364|d+=+datetime.datetime.utcfromtimestamp(int(unix_timestamp))
d_with_tz+=+datetime.datetime(
++++year=d.year,
++++month=d.month,
++++day=d.day,
++++hour=d.hour,
++++minute=d.minute,
++++second=d.second,
++++tzinfo=pytz.UTC)|362365|entityMap^0|6|8|R|5|1K|8|0|0|A|6|N|A|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|17|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|18|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|19|8|@]|D|@]|E|$I|J]]|$1|S|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|T|$]]

By default, the <code>datetime</code> object is <code>naive</code> in Python, so you need to make both of them either naive or aware <code>datetime</code> objects. This can be done using:

<pre><code>import datetime
import pytz

utc=pytz.UTC

challenge.datetime_start = utc.localize(challenge.datetime_start) 
challenge.datetime_end = utc.localize(challenge.datetime_end) 
# now both the datetime objects are aware, and you can compare them
</code></pre>

Note: This would raise a <code>ValueError</code> if <code>tzinfo</code> is already set. If you are not sure about that, just use

<pre><code>start_time = challenge.datetime_start.replace(tzinfo=utc)
end_time = challenge.datetime_end.replace(tzinfo=utc)
</code></pre>

BTW, you could format a UNIX timestamp in datetime.datetime object with timezone info as following

<pre><code>d = datetime.datetime.utcfromtimestamp(int(unix_timestamp))
d_with_tz = datetime.datetime(
 year=d.year,
 month=d.month,
 day=d.day,
 hour=d.hour,
 minute=d.minute,
 second=d.second,
 tzinfo=pytz.UTC)
</code></pre>

blocks|key|144242|text|datetime.datetime.now不支持时区。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|144243|Django附带了一个帮助器，它需要pytz|144244|from+django.utils+import+timezone
now+=+timezone.now()|code-block|syntax|javascript|144245|您应该能够将now与challenge.datetime_start进行比较|144246|entityMap^0|0|L|0|I|4|0|0|6|3|A|O|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|P|$]]

<code>datetime.datetime.now</code> is not timezone aware.

Django comes with a helper for this, which requires <code>pytz</code>

<pre><code>from django.utils import timezone
now = timezone.now()
</code></pre>

You should be able to compare <code>now</code> to <code>challenge.datetime_start</code>

blocks|key|362491|text|因此，我要解决这个问题的方法是确保两个日期时间位于正确的时区。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|362492|我可以看到您正在使用datetime.now()，它将返回系统当前时间，但没有设置tzinfo。|offset|length|style|CODE|362493|tzinfo是附加到datetime的信息，以便让它知道它所在的时区。如果你使用的是朴素的datetime，你需要在整个系统中保持一致。我强烈建议只使用datetime.utcnow()|362494|考虑到您正在创建与tzinfo关联的datetime，您需要做的是确保它们被本地化(与tzinfo关联)到正确的时区。|362495|看看Delorean，它使处理这类事情变得容易得多。|362496|entityMap|0|LINK|mutability|MUTABLE|url|http://delorean.readthedocs.org/en/latest/^0|0|A|E|0|24|H|0|0|2|8|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@$D|X|E|Y|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|12|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|13|8|@]|9|@$D|14|E|15|1|16]]|A|$]]|$1|N|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]]]

So the way I would solve this problem is to make sure the two datetimes are in the right timezone. 

I can see that you are using <code>datetime.now()</code> which will return the systems current time, with no tzinfo set. 

tzinfo is the information attached to a datetime to let it know what timezone it is in. If you are using naive datetime you need to be consistent through out your system. I would highly recommend only using <code>datetime.utcnow()</code>

seeing as somewhere your are creating datetime that have tzinfo associated with them, what you need to do is make sure those are localized (has tzinfo associated) to the correct timezone.

Take a look at <a href="http://delorean.readthedocs.org/en/latest/" rel="nofollow">Delorean</a>, it makes dealing with this sort of thing much easier.

blocks|key|362525|text|它正在从我身上发挥作用。在这里，我创建了表datetime，并在datetime上添加了10分钟。稍后，根据当前时间，执行过期操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|362526|from+datetime+import+datetime,+time,+timedelta
import+pytz|code-block|syntax|javascript|362527|在数据库日期时间上增加了10分钟|362528|table_datetime+=+'2019-06-13+07:49:02.832969‘(示例)|362529|#+Added+10+minutes+on+database+datetime
#+table_datetime+=+'2019-06-13+07:49:02.832969'+(example)

table_expire_datetime+=+table_datetime+%2B+timedelta(minutes=10+)

#+Current+datetime
current_datetime+=+datetime.now()


#+replace+the+timezone+in+both+time
expired_on+=+table_expire_datetime.replace(tzinfo=utc)
checked_on+=+current_datetime.replace(tzinfo=utc)


if+expired_on+<+checked_on:
++++print("Time+Crossed)
else:
++++print("Time+not+crossed+")|362530|这对我很管用。|362531|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

It is working form me.
Here I am geeting the table created datetime and adding 10 minutes on the datetime.
later depending on the current time, Expiry Operations are done.

<pre><code>from datetime import datetime, time, timedelta
import pytz
</code></pre>

Added 10 minutes on database datetime

table_datetime = '2019-06-13 07:49:02.832969' (example)

<pre><code># Added 10 minutes on database datetime
# table_datetime = '2019-06-13 07:49:02.832969' (example)

table_expire_datetime = table_datetime + timedelta(minutes=10 )

# Current datetime
current_datetime = datetime.now()


# replace the timezone in both time
expired_on = table_expire_datetime.replace(tzinfo=utc)
checked_on = current_datetime.replace(tzinfo=utc)


if expired_on &lt; checked_on:
 print("Time Crossed)
else:
 print("Time not crossed ")
</code></pre>

It worked for me.

blocks|key|144395|text|只要：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|144396|dt+=+datetimeObject.strftime(format)+#+format+=+your+datetime+format+ex)+'%25Y+%25d+%25m'
dt+=+datetime.datetime.strptime(dt,format)|code-block|syntax|javascript|144397|所以要这样做：|144398|start_time+=+challenge.datetime_start.strftime('%25Y+%25d+%25m+%25H+%25M+%25S')
start_time+=+datetime.datetime.strptime(start_time,'%25Y+%25d+%25m+%25H+%25M+%25S')

end_time+=+challenge.datetime_end.strftime('%25Y+%25d+%25m+%25H+%25M+%25S')
end_time+=+datetime.datetime.strptime(end_time,'%25Y+%25d+%25m+%25H+%25M+%25S')|144399|然后使用start_time和end_time|offset|length|style|CODE|144400|entityMap^0|0|0|0|0|4|A|F|8|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@$M|X|N|Y|O|P]|$M|Z|N|10|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

Just:
<pre><code>dt = datetimeObject.strftime(format) # format = your datetime format ex) '%Y %d %m'
dt = datetime.datetime.strptime(dt,format)
</code></pre>
So do this:
<pre><code>start_time = challenge.datetime_start.strftime('%Y %d %m %H %M %S')
start_time = datetime.datetime.strptime(start_time,'%Y %d %m %H %M %S')

end_time = challenge.datetime_end.strftime('%Y %d %m %H %M %S')
end_time = datetime.datetime.strptime(end_time,'%Y %d %m %H %M %S')
</code></pre>
and then use <code>start_time</code> and <code>end_time</code>

blocks|key|362583|text|您正在尝试为已具有时区的date_time设置时区。使用replace和astimezone函数。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|362584|local_tz+=+pytz.timezone('Asia/Kolkata')

current_time+=+datetime.now().replace(tzinfo=pytz.utc).astimezone(local_tz)|code-block|syntax|javascript|362585|entityMap^0|S|7|10|A|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

You are trying to set the timezone for date_time which already has a timezone.
Use <code>replace</code> and <code>astimezone</code> functions.
<pre><code>local_tz = pytz.timezone('Asia/Kolkata')

current_time = datetime.now().replace(tzinfo=pytz.utc).astimezone(local_tz)
</code></pre>

blocks|key|362634|text|没有第三方，只有本机datetime模块。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|362635|from+datetime+import+datetime,+timedelta,+timezone

time1+=+datetime.strptime('2021-07-15T00:22:02%2B0000',+'%25Y-%25m-%25dT%25H:%25M:%25S%25z')
time2+=+datetime(2021,+7,+15,+tzinfo=timezone(offset=timedelta()))
if+time1+<+time2:
++++print(True)|code-block|syntax|javascript|362636|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

no third-party, only the native datetime module.
<pre><code>from datetime import datetime, timedelta, timezone

time1 = datetime.strptime('2021-07-15T00:22:02+0000', '%Y-%m-%dT%H:%M:%S%z')
time2 = datetime(2021, 7, 15, tzinfo=timezone(offset=timedelta()))
if time1 &lt; time2:
 print(True)
</code></pre>

I am trying to compare the current date and time with dates and times specified in models using comparison operators:

<pre><code>if challenge.datetime_start &lt;= datetime.now() &lt;= challenge.datetime_end:
</code></pre>

The script errors out with: 

<pre><code>TypeError: can't compare offset-naive and offset-aware datetimes
</code></pre>

The models look like this:

<pre><code>class Fundraising_Challenge(models.Model):
 name = models.CharField(max_length=100)
 datetime_start = models.DateTimeField()
 datetime_end = models.DateTimeField()
</code></pre>

I also have django using locale date and times.

What I haven't been able to find is the format django uses for DateTimeField(). Is it naive or aware? And how do I get datetime.now() to recognize locale datetime?

Can't compare naive and aware datetime.now() <= challenge.datetime_end

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我尝试使用比较运算符将当前日期和时间与模型中指定的日期和时间进行比较：if challenge.datetime_start <= datetime.now() <= challenge.datetime_end:脚本错误输出为：TypeError: can't compare offset-naive and off...

问无法比较naive和aware datetime.now() <= challenge.datetime_end
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问无法比较naive和aware datetime.now() <= challenge.datetime_endEN