Why date value added from java to Sqlite database in Android is always null? : I am absolute beginner to Android. But I am having a problem with working with date in Android. Now I am inserting a value from EditText field to a Sqlite table column that is date database date. It is always null when it is added to database. Please help me. What is wrong with my code ?

> My DatabaseHelper class

    public class DatabaseHelper extends SQLiteOpenHelper {
    
        private static final int DATABASE_VERSION = 1;
        private static final String DATABASE_NAME = "todo.db";
        private static final String TABLE_NAME = "task";
        private static final String COLUMN_ID = "id";
        private static final String COLUMN_DESCRIPTION = "description";
        private static final String COLUMN_DATE ="date";
        private static final String COLUMN_DONE = "done";
        private static final String CREATE_TABLE = "CREATE TABLE "+TABLE_NAME+" ("+COLUMN_ID+" INTEGER PRIMARY KEY AUTOINCREMENT,"+COLUMN_DESCRIPTION+" TEXT,"+
        COLUMN_DATE+" DATE,"+COLUMN_DONE+" BOOLEAN)";
        SQLiteDatabase db;
    
        public DatabaseHelper(Context context)
        {
            super(context,DATABASE_NAME,null,DATABASE_VERSION);
        }
    
    
        @Override
        public void onCreate(SQLiteDatabase db)
        {
            this.db = db;
            db.execSQL(CREATE_TABLE);
        }
    
        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            String query = "DROP TABLE IF EXISTS "+TABLE_NAME;
            db.execSQL(query);
            this.onCreate(db);
        }
    
        public  void insertTask(Task task)
        {
            db = getWritableDatabase();
            ContentValues values = new ContentValues();
            values.put(COLUMN_DESCRIPTION,task.getDescription());
            values.put(COLUMN_DATE,task.getDate().toString());
            values.put(COLUMN_DONE,Boolean.FALSE.toString());
            db.insert(TABLE_NAME, null, values);
            db.close();
        }
    }

> This is my save method in Fragment

    public void saveTask()
        {
            String description = tfDescription.getText().toString();
            String date = tfDate.getText().toString();
    
            if(description.isEmpty())
            {
                Toast.makeText(getActivity().getBaseContext(),"Description is required",Toast.LENGTH_SHORT).show();
            }
            else if(date.isEmpty())
            {
                Toast.makeText(getActivity().getBaseContext(),"Date is required",Toast.LENGTH_SHORT).show();
            }
            else if(description.length()<getResources().getInteger(R.integer.min_description_length))
            {
                String minChar = String.valueOf(getResources().getInteger(R.integer.min_description_length));
                Toast.makeText(getActivity().getBaseContext(),"Description should be minium "+minChar+" characters",Toast.LENGTH_SHORT).show();
            }
            else{
                //check date
                SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy");
                boolean parseOk = false;
                Date taskDate = new Date();
                try{
                    taskDate = format.parse(date);
                    Task task = new Task();
                    task.setDescription(description);
                    task.setDate(taskDate);
                    dbHelper.insertTask(task);
                    parseOk = true;
                }
                catch(ParseException e)
                {
                    parseOk = false;
                }
    
                if(parseOk)
                {
                    //insert task to database
                    Toast.makeText(getActivity().getBaseContext(),"Task saved",Toast.LENGTH_SHORT).show();
                }
                else{
                    Toast.makeText(getActivity().getBaseContext(),"Invalid date format",Toast.LENGTH_SHORT).show();
                }
            }
        }

> This is my Task class

    public class Task {
        private int Id;
        private String Description;
        private java.util.Date TaskDate;
        private boolean Done;
    
        public void setId(int Id)
        {
            this.Id = Id;
        }
    
        public int getId()
        {
            return this.Id;
        }
    
        public void setDescription(String Description)
        {
            this.Description = Description;
        }
    
        public String getDescription()
        {
            return this.Description;
        }
    
        public void setDate(Date taskDate)
        {
            this.TaskDate = taskDate;
        }
    
        public Date getDate(){
            return this.TaskDate;
        }
    
        public void setDone(Boolean done)
        {
            this.Done = done;
        }
    
        public Boolean getDone()
        {
            return this.Done;
        }
    }


Please help me why my date value is always null in database. The input format of the text field is MM/dd/yyyy for date. Please what is wrong with my code ?