title: Set attributes of SplitDateTimeField
body: <p>I have a form which I build dynamically based on data provided by the user using crispy-forms.
  For certain types of data, I want to provide a SplitDateTimeField to the user. I wanted to add attributes to this field, like a placeholder, a label or a help_text, but couldn't find any hint on how to do it.</p>
  <p>Maybe I'm searching in the wrong place, but I couldn't find even a little piece of advice anywhere even though I've been searching for quite a while.</p>
  <p>I used an AdminSplitDateTime widget in order to at least get labels :</p>
  <pre><code>datetime = forms.SplitDateTimeField(widget=AdminSplitDateTime())
  </code></pre>
  <p>While it gets closer to what I want, that's not exactly it. I've searched <a href="https://docs.djangoproject.com/fr/4.0/ref/forms/fields/#splitdatetimefield" rel="nofollow noreferrer">in the documentation</a> and tried with a SplitDateTimeWidget but didn't manage to make any of its attributes to work.</p>
  <p>I'm currently lost as to what I should do so I'm asking here.</p>
  <p>My form, simplified (I kept the crispy FormHelper in it in case it impacts the behaviour of the form) :</p>
  <pre><code>from crispy_forms.helper import FormHelper
  from django.urls import reverse_lazy
  
  class ScriptInputForm2(forms.Form):
      datetime = forms.SplitDateTimeField(widget=AdminSplitDateTime())
  
      def __init__(self, *args, **kwargs):
          super().__init__(*args, **kwargs)
          
          self.helper = FormHelper()
  
          self.helper.add_input(Submit('submit', 'Submit'))
          self.helper.add_input(Submit('cancel', 'Back To Selection Page', css_class='ms-2 btn btn-danger'))
  
          self.helper.attrs = {
              'novalidate': ''
          }
  
          self.helper.form_class = 'form-horizontal'
          self.helper.label_class = 'col-2'
          self.helper.field_class = 'col-10'
          
          self.helper.form_action = reverse_lazy('index')
  </code></pre>