app\models\Contest::state PHP Method

    public function state()
    {
        if ($this->entry_starts_at === null || $this->entry_starts_at->isFuture()) {
            return 'preparing';
        }
        if ($this->isSubmissionOpen()) {
            return 'entry';
        }
        if ($this->isVotingOpen()) {
            return 'voting';
        }
        if ($this->show_votes) {
            return 'results';
        }
        return 'over';
    }