Django表单中的初始时间不会更新

from django.utils import timezone

def my_view(request):
    current_time = timezone.now()
    form = MyForm(initial={'time_field': current_time})
    # 其他处理逻辑

from django import forms
from django.utils import timezone

class MyForm(forms.Form):
    time_field = forms.DateTimeField()

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields['time_field'].initial = timezone.now()

def my_view(request):
    form = MyForm()
    # 其他处理逻辑

from django import forms
from django.utils import timezone

class MyModel(models.Model):
    time_field = models.DateTimeField()

class MyModelForm(forms.ModelForm):
    class Meta:
        model = MyModel
        fields = ['time_field']

def my_view(request):
    instance = MyModel.objects.first()
    instance.time_field = timezone.now()
    form = MyModelForm(instance=instance)
    # 其他处理逻辑