问Sqlite数据库统一中的系统数据保存为4位数

EN

PlayerPrefs.SetString("date_time", System.DateTime.Now.ToString("yyyy-MM-dd")); 
CurrentDate = PlayerPrefs.GetString("date_time");

//Add new event with o timer at the start of the game
    public void AddEvent(){
        using (IDbConnection dbConnection = new SqliteConnection(connectionString)){
            dbConnection.Open();

            using(IDbCommand dbCmd = dbConnection.CreateCommand()){
                string sqlQuery = String.Format("INSERT INTO events(date,timer_count) VALUES({0},0)",System.DateTime.Now.ToString("yyyy-MM-dd"));
                dbCmd.CommandText = sqlQuery;
                dbCmd.ExecuteScalar();
                dbConnection.Close();
            }
        }

        PlayerPrefs.SetString("date_time", System.DateTime.Now.ToString("yyyy-MM-dd")); 
        Debug.Log(PlayerPrefs.GetString("date_time"));
    }