Create a variable Date in format "yyyy-mm-dd"

I am trying to insert to my table, a date in format "yyyy-mm-dd". My table has a field date type DATETIME and I use SQLite DB SYSTEM. I need to be in this format, so later to have the option to select dates from - then.

My table:

CREATE TABLE "IsSELECTED"(
           "date" DATETIME PRIMARY KEY  NOT NULL  DEFAULT (CURRENT_DATE) ,
           "morning" BOOL NOT NULL  DEFAULT (0) ,
           "noon" BOOL NOT NULL  DEFAULT (0) ,
           "night" BOOL NOT NULL  DEFAULT (0) 
     )

and the method which i am trying to insert.

        public void setTodayInfo(HttpSession session, Date date) 
            throws SQLException, ClassNotFoundException {

        System.out.println("Initialize today's info...");
        String sq = "INSERT INTO IsSELECTED (date, morning, noon, night) VALUES (?, ?, ?, ?)";

        try {       
            Class.forName(typeDB);
            c = DriverManager.getConnection(path);            
            stm = c.prepareStatement(sq);

            PreparedStatement stm = c.prepareStatement(sq);

            stm.setDate(1, date);
            stm.setBoolean(2, FALSE);
            stm.setBoolean(3, FALSE);
            stm.setBoolean(4, FALSE);

            int rowsAffected = stm.executeUpdate();

        } catch (SQLException e) { 
        System.out.println(e.getMessage());
        } finally {
        if (stm != null) {
            stm.close();
        }
        if (c != null) {
            c.close();
        }
    }          
    }

How can i create a variable (DATE) with the format "yyyy-mm-dd" ?