## forms.py
class MultiDatesField(forms.Field):
    def to_python(self, value):
        """Normalize timestamps to a list of strings."""
        dates = []

        if not value:
            return dates

        for ts in value.split(','):
            try:
                dt = parse_date(ts)
                print(dt)
                dates.append(dt)
            except:
                pass

        return dates

class CourseAddStep2Form(forms.ModelForm):

    dates = MultiDatesField(required=False)
    #[...]


## views.py
@user_is_org_admin
def course_add_step2(request):
    if request.method == "POST":
        form = CourseAddStep2Form(request.POST)
        if form.is_valid():
        #[...]