title: django forms dateField fails validation
body: <p>I am trying to validate a User Profiling form in django and I can't. It seems that there is something wrong with forms.dateField(). It does not validate (ie. is_valid() return false)</p>
  
  <p>this is my forms dateField entry:
  <code>date_of_birth = forms.DateField(label=u'date of birth', input_formats='%d/%m/%Y', required=False, widget=forms.DateInput(format = '%d/%m/%Y'))</code></p>
  
  <p>I noticed that <code>request.POST.get('date_of_birth', '')</code> returns the correct date (ie. the date I have typed in the html form field). </p>
  
  <p>I also noticed that in this function:</p>
  
  <pre><code>def clean_date_of_birth(self):
      date = self.cleaned_data['date_of_birth']
  </code></pre>
  
  <p>date object is always None. </p>
  
  <p>What am I doing wrong? </p>
  
  <p>EDIT: </p>
  
  <p>This is what I am trying to enter:
  <code>29/07/1974</code> (July 29th, 1974)</p>
  
  <p>This is the output of 'submit' (various requests)</p>
  
  <pre><code>29/07/1974
  profile form is *NOT* valid
  [23/Feb/2012 12:16:27] "POST /profile/chris/ HTTP/1.1" 200 16289
  
  29/7/1974
  profile form is *NOT* valid
  [23/Feb/2012 12:16:33] "POST /profile/chris/ HTTP/1.1" 200 16289
  
  1974-07-29
  profile form is *NOT* valid
  [23/Feb/2012 12:18:15] "POST /profile/chris/ HTTP/1.1" 200 16289
  </code></pre>
  
  <p>This is my template</p>
  
  <pre><code>    &lt;div class="input_area"&gt;
          &lt;form id="profile_form" method="post" action="/profile/{{ user.username }}/"&gt;{% csrf_token %}
              {{ form.as_p }}
              &lt;input type="submit" id="submit" value="save" class="submitButton idle" style="width:70px" /&gt;
          &lt;/form&gt;
      &lt;/div&gt;
  </code></pre>
  
  <p>this is my views.py</p>
  
  <pre><code>def profile(request, username):
      form = ProfileForm(request.POST)
      print request.POST.get('date_of_birth', 'None')
      try:
          user = User.objects.get(username=username)
      except User.DoesNotExist:
          raise Http404(u'User not Found')
      if form.is_valid():
          print 'profile form is valid'
      else:
          print 'profile form is *NOT* valid'
  </code></pre>
  
  <p>and finally this is my forms.py (do not use clean_data functions at the moment)</p>
  
  <pre><code>class ProfileForm(forms.Form):
  
      tz = []
      timezones = Timezone.objects.all()
      for timezone in timezones:
          val = str(timezone.hour)
          v = val.split(':')
          tuple = (timezone.id, '('+timezone.sign+''+v[0]+':'+v[1]+') '+timezone.name)
          tz.append(tuple)
  
      sex = [('male','male'),('female', 'female'),('unknown', 'prefer not to say')]
      real_name = forms.CharField(label=u'real name', widget=forms.TextInput, required=False)
      date_of_birth = forms.DateField(label=u'date of birth', input_formats='%d/%m/%Y', required=False, widget=forms.DateInput(format = '%d/%m/%Y'))
      pp_email = forms.EmailField(label=u'Paypal Email', widget=forms.TextInput, required=False)
      gender = forms.ChoiceField(label=u'sex', choices=sex, widget=forms.Select(), required=False)
      timezone = forms.ChoiceField(label=u'time zone', choices=tz, widget=forms.Select())
      address = forms.CharField(label=u'street address', widget=forms.Textarea, required=False)
      postal  = forms.CharField(label=u'postal code', widget=forms.TextInput, required=False)
  </code></pre>