[英]Python string to Django timezone (aware datetime)
TL;DR;长话短说;博士;
How to convert 2016-01-01
to Django timezone
?如何将2016-01-01
转换为 Django timezone
?
Full version :完整版:
I receive a query string parameter from a form and I wanna get that string and use it as a datetime filter in Django.我从表单收到一个查询字符串参数,我想获取该字符串并将其用作 Django 中的日期时间过滤器。 The problem is that when I convert the string to a datetime, it's not making an aware datetime and so I lose a few hours due to timezone different.问题是,当我将字符串转换为日期时间时,它并没有意识到日期时间,因此由于时区不同,我损失了几个小时。 Maybe I'm losing myself in the formatting, but I'm not being able to do it.也许我在格式化中迷失了自己,但我做不到。
I have pytz, I have USE_TZ = True
in my settings as well.我有 pytz,我的设置中也有USE_TZ = True
。
example:例子:
from datetime import date
# Example from what I receive as GET querystring parameter
start_date, end_date = '15-01-2016', '16-01-2016'
DATE_FORMAT = '%Y-%m-%d'
start_date = start_date.split('-')
start_date = date(int(start_date[2]), int(start_date[1]), int(start_date[0]))
sd_filter = start_date.strftime(DATE_FORMAT)
end_date = end_date.split('-')
end_date = date(int(end_date[2]), int(end_date[1]), int(end_date[0]))
ed_filter = end_date.strftime(DATE_FORMAT)
#query
my_list = MyModel.objects.filter(created_at__range=(sd_filter, ed_filter))
the problem lies in the filter.问题出在过滤器上。 I'm losing a few hours due to timezone from Django settings.由于 Django 设置的时区,我损失了几个小时。
UPDATE: I don't need to convert a datetime.now()
to my time.更新:我不需要将datetime.now()
转换为我的时间。 I need to convert a string to datetime.我需要将字符串转换为日期时间。
I know this is old but maybe will be helpful since I got into this situation as well:我知道这是旧的,但也许会有所帮助,因为我也遇到了这种情况:
What about using make_aware()?使用 make_aware() 怎么样?
from datetime import datetime
from django.utils.timezone import make_aware
date = '22-05-2018'
aware = make_aware(datetime.strptime(date, '%d-%m-%Y'))
This will use the currently active timezone (activated by timezone.activate
).这将使用当前活动的时区(由timezone.activate
激活)。 If no timezone is activated explicitly, it would use the default timezone -- TIME_ZONE
specified in settings.py
.如果没有明确激活时区,它将使用默认时区——在settings.py
中指定的TIME_ZONE
。
You are comparing time-zone unaware Python Date
objects with the time-zone aware DateTimeField
fields in your database.您正在将不了解时区的 Python Date
对象与数据库中了解时区的DateTimeField
字段进行比较。 It is probably more intuitive to use DateTime
objects - and these can be made time-zone aware easily as follows:使用DateTime
对象可能更直观 - 这些对象可以很容易地识别时区,如下所示:
import datetime
import pytz
start_date = '15-01-2016'
end_date = '16-01-2016'
date_format = '%d-%m-%Y'
unaware_start_date = datetime.datetime.strptime(start_date, date_format)
aware_start_date = pytz.utc.localize(unaware_start_date)
unaware_end_date = datetime.datetime.strptime(end_date, date_format)
aware_end_date = pytz.utc.localize(unaware_end_date)
my_list = MyModel.objects.filter(created_at__range=(aware_start_date, aware_end_date))
This creates unaware_start_date
and unaware_end_date
DateTime
objects using strptime()
.这将使用strptime()
创建unaware_start_date
和unaware_end_date
DateTime
对象。 It then uses pytz.utc.localize
to make the objects time-zone aware (you will need to replace utc
with your relevant time-zone).然后它使用pytz.utc.localize
使对象具有时区意识(您需要将utc
替换为您的相关时区)。
You can then have time-zone aware DateTime
objects - aware_start_date
and aware_end_date
.然后,您可以拥有时区感知DateTime
对象 - aware_start_date
和aware_end_date
。 Feeding these into your filter should yield the desired results.将这些输入过滤器应该会产生预期的结果。
from django.utils import timezone
timestamp_raw = timezone.now() #current time, or use whatever time you have
date_format = '%Y-%m-%d %H:%M:%S' #time format day-month-year hour:minutes:seconds
timestamp = timezone.datetime.strftime(timestamp_raw, date_format)
Or Using the new f-string formatter或者使用新的 f-string 格式化程序
f"{timezone:%Y-%m-%d %H:%M:%S %p}"
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