在Django ModelForm中，如何接受包含毫秒的日期时间字符串？

from django.forms import DateTimeField
from django.utils.dateparse import parse_datetime

class MillisecondDateTimeField(DateTimeField):
    def to_python(self, value):
        value = super().to_python(value)
        if value and isinstance(value, str):
            try:
                value = parse_datetime(value)
            except ValueError:
                pass
        return value

from django import forms
from .models import YourModel

class YourModelForm(forms.ModelForm):
    your_datetime_field = MillisecondDateTimeField()

    class Meta:
        model = YourModel
        fields = ['your_datetime_field']