我试着按照你的要求用**DateField()**解决这个问题
models.py

from django.db import models
from django.contrib.auth.models import User

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    birthday = models.DateField(blank=True, null=True)

    def __str__(self):
        return f'{self.user.username}'

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admin.py

from django import forms
from django.contrib import admin
from django.contrib.auth.admin import UserAdmin
from django.contrib.auth.models import User
from .models import Profile
import datetime

class ProfileAdminForm(forms.ModelForm):
    birthday_month = forms.IntegerField(label='Birthday Month', widget=forms.Select(choices=[(i, i) for i in range(1, 13)]))
    birthday_day = forms.IntegerField(label='Birthday Day', widget=forms.Select(choices=[(i, i) for i in range(1, 32)]))
    birthday_year = forms.IntegerField(label='Birthday Year', widget=forms.Select(choices=[(i, i) for i in range(datetime.datetime.now().year - 200, datetime.datetime.now().year)]))

    class Meta:
        model = Profile
        fields = ['user', 'birthday_month', 'birthday_day', 'birthday_year']

class ProfileAdmin(admin.ModelAdmin):
    form = ProfileAdminForm
    list_display = ['user', 'birthday']

    def save_model(self, request, obj, form, change):
        month = form.cleaned_data['birthday_month']
        day = form.cleaned_data['birthday_day']
        year = form.cleaned_data['birthday_year']

        # Format the date as YYYY-MM-DD
        obj.birthday = f'{year:04d}-{month:02d}-{day:02d}'
        super().save_model(request, obj, form, change)

admin.site.register(Profile, ProfileAdmin)

class CustomUserAdmin(UserAdmin):
    pass

admin.site.unregister(User)
admin.site.register(User, CustomUserAdmin)

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