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对于我的大多数应用程序，使用 TIME_ZONE 和 USE_TZ 设置保存日期时间都很好。我的问题是，我怎样才能完成保存具有 UTC 日期时间的模型，但是设置了日期时间以便转换回用户输入的时区是正确的？下面给出了模型、视图、表单和 html。如果 USE_TZ = False 在 settings.py 文件中，此代码将起作用，但我想为项目中的其他所有内容保留时区。

模型：

class TZTestModel(models.Model):
    timezone = TimeZoneField()
    dt = models.DateTimeField()

看法：

class TZTestView(LoginRequiredMixin, TemplateView):
    template_name = "tz_test.html"

    def get_context_data(self, **kwargs):
        return {
            'form': self.form
        }

    def dispatch(self, request, *args, **kwargs):
        self.form = TZTestForm(self.request.POST or None)
        return super(TZTestView, self).dispatch(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        if self.form.is_valid():
            self.form.save()
        return self.render_to_response(self.get_context_data())

形式：

class TZTestForm(forms.ModelForm):
    class Meta:
        model = TZTestModel

    def clean(self):
        timezone = self.cleaned_data['timezone']
        dt = self.cleaned_data['dt']
        dt = timezone.localize(dt)
        self.cleaned_data['dt'] = pytz.UTC.normalize(dt.astimezone(pytz.UTC))
        return self.cleaned_data

模板：

<html>
    <body>
        <form method="post">
            {% csrf_token %}
            {{ form }}
            <input type="submit">
        </form>
    </body>
</html>

例子：

我希望能够输入“美国/阿拉斯加”的时区和今天 13:00 的日期时间，将其保存为 UTC 值，然后能够转换回“美国/阿拉斯加”并获得正确的值.

本质上，我试图将一个模型的日期时间保存在与我的应用程序不同的时区，其中时区由用户以与指定日期时间相同的形式指定。

4

2 回答 2

3

我对对象级时区也有同样的问题。

我找到了这个博客条目。它并不完美，但它有效！并且不是太复杂。加上处理管理员的处理。

在此处粘贴片段：

确保在所需时区处理表单：

def view(request):

    if request.method == 'POST':
        tz_form = TimeZoneForm(request.POST)
        if tz_form.is_valid():
            tz = tz_form.cleaned_data['event_time_zone']
            timezone.activate(tz)
            # Process the full form now
    else:
        # assuming we have an event object already
        timezone.activate(event.event_time_zone)
        # Continue to create form for display on the web page

在管理员列表视图中正确显示

class EventAdmin(admin.ModelAdmin):
    list_display = [..., 'event_datetime_in_timezone', ...]

    def event_datetime_in_timezone(self, event):
        """Display each event time on the changelist in its own timezone"""
        fmt = '%Y-%m-%d %H:%M:%S %Z'
        dt = event.event_datetime.astimezone(pytz_timezone(event.event_time_zone))
        return dt.strftime(fmt)
    event_datetime_in_timezone.short_description = _('Event time')

在管理员添加视图中正确解释日期时间

class EventAdmin(admin.ModelAdmin):
    # ...

    # Override add view so we can peek at the timezone they've entered and
    # set the current time zone accordingly before the form is processed
    def add_view(self, request, form_url='', extra_context=None):
        if request.method == 'POST':
            tz_form = TimeZoneForm(request.POST)
            if tz_form.is_valid():
                timezone.activate(tz_form.cleaned_data['event_time_zone'])
        return super(EventAdmin, self).add_view(request, form_url, extra_context)

在管理员编辑视图中正确处理时区

class EventAdmin(admin.ModelAdmin):
    # ...

    # Override change view so we can peek at the timezone they've entered and
    # set the current time zone accordingly before the form is processed
    def change_view(self, request, object_id, form_url='', extra_context=None):
        if request.method == 'POST':
            tz_form = TimeZoneForm(request.POST)
            if tz_form.is_valid():
                timezone.activate(tz_form.cleaned_data['event_time_zone'])
        else:
            obj = self.get_object(request, unquote(object_id))
            timezone.activate(obj.event_time_zone)
        return super(EventAdmin, self).change_view(request, object_id, form_url, extra_context)
于 2014-10-14T23:17:51.603 回答
0

编辑：表单字段的 pastebin 源：http: //pastebin.com/j4TnnHTS 进一步讨论：https ://code.djangoproject.com/ticket/21300

看起来这样做的方法是创建一个返回天真的日期时间的自定义表单字段，然后将其转换为用户指定的时区，然后将其转换为 UTC。

自定义字段：

class DateTimeNoTimeZoneField(forms.DateTimeField):
    def to_python(self, value):
        """
        Validates that the input can be converted to a datetime. Returns a
        Python datetime.datetime object.
        """
        if value in validators.EMPTY_VALUES:
            return None
        if isinstance(value, datetime.datetime):
            return value
        if isinstance(value, datetime.date):
            return datetime.datetime(value.year, value.month, value.day)
        if isinstance(value, list):
            # Input comes from a SplitDateTimeWidget, for example. So, it's two
            # components: date and time.
            if len(value) != 2:
                raise ValidationError(self.error_messages['invalid'])
            if value[0] in validators.EMPTY_VALUES and value[1] in validators.EMPTY_VALUES:
                return None
            value = '%s %s' % tuple(value)
                # Try to coerce the value to unicode.
        unicode_value = force_text(value, strings_only=True)
        if isinstance(unicode_value, six.text_type):
            value = unicode_value.strip()
        # If unicode, try to strptime against each input format.
        if isinstance(value, six.text_type):
            for format in self.input_formats:
                try:
                    return self.strptime(value, format)
                except (ValueError, TypeError):
                    continue
        raise ValidationError(self.error_messages['invalid'])

形式：

class TZTestForm(forms.ModelForm):
    dt = DateTimeNoTimeZoneField()

    class Meta:
        model = TZTestModel

    def clean(self):
        tz = self.cleaned_data['timezone']
        dt = self.cleaned_data['dt']
        dt = pytz.UTC.normalize(tz.localize(dt).astimezone(pytz.UTC))
        self.cleaned_data['dt'] = dt
        return self.cleaned_data
于 2013-10-22T01:05:26.047 回答