How to implement Datetime widget in Django 2?

Question

Django

I'm using Django 2.2 In the model field:
USE_TZ = True

class Training(UuidBasedModel):
    client = models.ForeignKey('common.User', on_delete=models.CASCADE, verbose_name=_('Client'))
    canceled = models.BooleanField(default=False, verbose_name=_('Canceled'))
    cancel_reason = models.CharField(default='', max_length=255, blank=True, verbose_name=_('Cancel reason'))
    
    training_datetime = models.DateTimeField(default=timezone.localtime, verbose_name=_('Training date and time'))

The form is as follows:

class TrainingForm(forms.ModelForm):
    def clean(self):
        if self.cleaned_data['client'].trainings_list.filter(training_datetime__date=self.cleaned_data['training_datetime'].date()).exists():
            raise forms.ValidationError({'client': self.SECOND_TRAINING_FOR_SINGLE_CLIENT_ERROR})

    class Meta:
        model = models.Training
        fields = '__all__'
        widgets = {
            'training_datetime': forms.DateTimeInput(attrs={'type': 'datetime-local'}),
        }

Problems:
1) the default value is not inserted
2) after submitting the form, a KeyError occurs at the clean stage, there is no training_datetime.
If you remove the {'type': 'datetime-local'} attribute from the field widget, everything starts working.
But you need exactly datetime-local field with native controls, and datetime - deprecated.
among other things, datetime-local is not supported by firefox. So maybe there are some other options how to solve this problem.

Answer 1

Use some plugin like bootstrap datepicker. And don't use the built in DataTimeInput