change value of field while form save django view code example

Example 1: passing user instance django form submission

if form.is_valid():
    post = form.save(commit=False)
    post.author = request.user
    post.published_date = timezone.now()
    post.save()

Example 2: django model form

class YourForm(ModelForm):
	class Meta:
    	model = YourModel
    	fields = ['pub_date', 'headline', 'content', 'reporter']