url(r'^(?P<year>[0-9]{4})/(?P<month>[0-9]{2})/$', views.calendar, name='calendar')

  def find_lase_next_month(year, month):
  	cur_date = datetime.date(year, month, 15)
  	step = datetime.timedelta(days=30)
  	next, prev = cur_date + step, cur_date - step
  	nmonth, nyear = '{:02}'.format(next.month), next.year
  	pmonth, pyear = '{:02}'.format(prev.month), prev.year
  	res = {'nmonth': nmonth, 'nyear': nyear, 'pmonth': pmonth, 'pyear': pyear}

class PetAdd(generic.edit.CreateView):
	form_class = PetForm
	template_name = 'pets/pets_form.html'
	def form_valid(self, form):
		birth_date_ff = form.cleaned_data['form_birth_date']
		if birth_date_ff:
			birth_date_ff = birth_date_ff.split('.')[::-1]
		else:
			birth_date_ff = []
		instance = form.save(commit=False)
		instance.u_name = self.request.user
		a = instance.pet_name
		data = []
		for k in range(3):
			try:
				data.append(birth_date_ff.pop(0))
			except IndexError:
				data.append(None)
		instance.birth_year, instance.birth_month, instance.birth_date = data
		if not instance.pet_name:
			psn = instance.species.__str__()
			uniq, i = False, 0
			while uniq == False:
				i+=1
				pr_pet_name = '%s %s' % (psn, i)
				if not Pets.objects.filter(u_name=self.request.user, pet_name=pr_pet_name).exists():
					instance.pet_name = pr_pet_name
					uniq = True
		instance.save()
		self.object = instance
		return redirect(self.get_success_url())
class PetUpdate(generic.edit.UpdateView):
	form_class = PetForm
	template_name = 'pets/pets_form.html'
	model = Pets
	def get_object(self):
		object = super(PetUpdate, self).get_object()
		if self.request.user == object.u_name:
			return object
		else:
			raise PermissionDenied
	def get_initial(self):
		initial = super(PetUpdate, self).get_initial()
		initial['form_birth_date'] = self.object.form_birth_date
		return initial
	def form_valid(self, form):
		birth_date_ff = form.cleaned_data['form_birth_date']
		if birth_date_ff:
			birth_date_ff = birth_date_ff.split('.')[::-1]
		else:
			birth_date_ff = []
		pet_name_ff = form.cleaned_data['pet_name']
		instance = form.save(commit=False)
		data = []
		for k in range(3):
			try:
				data.append(birth_date_ff.pop(0))
			except IndexError:
				data.append(None)
		instance.birth_year, instance.birth_month, instance.birth_date = data
		if not pet_name_ff:
			psn = instance.species.__str__()
			uniq, i = False, 0
			while uniq == False:
				i+=1
				pr_pet_name = '%s %s' % (psn, i)
				if not Pets.objects.filter(u_name=self.request.user, pet_name=pr_pet_name).exists():
					instance.pet_name = pr_pet_name
					uniq = True
		instance.save()
		self.object = instance
		return redirect(self.get_success_url())