[Answer]-How to show a custom validation error for a DateTimeField in the Django admin?

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1👍

You can raise forms.ValidationError in forms.py
Here is an example:

class LoginForm(forms.Form):
    username = forms.CharField()
    password = forms.CharField(widget=forms.PasswordInput())

    def clean_username(self):
        username = self.cleaned_data.get("username")
        try:
            user = User.objects.get(username=username)
        except User.DoesNotExist:
            raise forms.ValidationError("Are you sure you are registered? We cannot find this user.")
        return username
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