'Sets a new due date.
Expects date to be a string that will be accepted by the input (for example, \'01/01/1970\')'

def change_problem_due_date(self, date):

    self.q(css='.subsection-header-actions    .configure-button').first.click()
    self.q(css='#due_date').fill(date)
    self.q(css='.action-save').first.click()
    self.wait_for_ajax()
