Oracle returning a cursor from a function or procedure

I have the following code, which appears to be working fine.

As you can in the last piece of SQL the date range is hard coded. Is there a way to wrap it in a procedure or function and return a cursor (passing the dates directly to the procedure or function ) then modifying my SQL to reference each day  that falls between the date range.

Ie  something like this without the hard coded dates

WITH calendar ( start_date, end_date ) AS (

  SELECT DATE '2021-07-01', DATE '2021-07-30' FROM DUAL

UNION ALL

  SELECT start_date + 1, end_date

  FROM   calendar

  WHERE  start_date + 1 <= end_date

)

SELECT start_date AS day

FROM   calendar

    CREATE OR REPLACE PROCEDURE generate_dates

     (

      p_start_date  IN DATE,

     p_end_date   IN DATE

    )

    AS 

        BEGIN

        END;

    END generate_dates;

EXEC generate_dates(

DATE '2021-07-01',

DATE '2021-07-31');

ALTER SESSION SET 

       NLS_DATE_FORMAT = 'MMDDYYYY HH24:MI:SS';

    create table holidays(

      holiday_date DATE,

     holiday_name VARCHAR2(20)

    );

    INSERT into holidays

      (holiday_date,

       holiday_name)

     VALUES

    (

     TO_DATE('2021/07/21 00:00:00',   'yyyy/mm/dd hh24:mi:ss'), 'July 21 2021');

    Create table employees(

     employee_id NUMBER(6), 

     first_name VARCHAR2(20),

     last_name VARCHAR2(20),

     card_num VARCHAR2(10),

work_days VARCHAR2(7)

    );

     ALTER TABLE employees

             ADD ( CONSTRAINT employees_pk

           PRIMARY KEY (employee_id));

    INSERT INTO employees                   

    (

    EMPLOYEE_ID,

    first_name, 

    last_name,

    card_num, 

    work_days

   )

    WITH names AS ( 

SELECT 1, 'Jane',     'Doe',      'F123456', 'NYYYYYN'   FROM dual UNION ALL 

 SELECT 2, 'Madison', 'Smith', 'R33432','NYYYYYN'

     FROM dual UNION ALL 

     SELECT 3, 'Justin',   'Case',     'C765341','NYYYYYN'

     FROM dual UNION ALL 

    SELECT 4, 'Mike',     'Jones',      'D564311','NYYYYYN' FROM dual 

    ) SELECT * FROM names;  

    create table timeoff(

         seq_num integer  GENERATED BY DEFAULT AS IDENTITY (START WITH 1) NOT NULL,

    employee_id NUMBER(6),

    timeoff_date DATE,

    timeoff_type VARCHAR2(1),

     constraint timeoff_chk check (timeoff_date=trunc(timeoff_date, 'dd')),

      constraint timeoff_pk primary key (employee_id, timeoff_date)

     );

   INSERT INTO timeoff (EMPLOYEE_ID,TIMEOFF_DATE,TIMEOFF_TYPE

    ) 

     WITH dts AS ( 

        SELECT 1, to_date('20210726 00:00:00','YYYYMMDD HH24:MI:SS'),'V'    FROM dual UNION ALL 

    SELECT 2, to_date('20210726 00:00:00','YYYYMMDD HH24:MI:SS'),'V'    FROM dual UNION ALL 

    SELECT 2, to_date('20210727 00:00:00','YYYYMMDD HH24:MI:SS'),'V'    FROM dual  ) 

    SELECT * FROM dts;

            CREATE TABLE  emp_attendance(    

     seq_num integer  GENERATED BY DEFAULT AS IDENTITY (START WITH 1) NOT NULL,

      employee_id NUMBER(6),

      start_date DATE,

      end_date DATE,

      week_number NUMBER(2),

      create_date DATE DEFAULT SYSDATE

       );

    create table absences(

    seq_num integer  GENERATED BY DEFAULT AS IDENTITY (START WITH 1) NOT NULL,

    employee_id NUMBER(6),

    absent_date DATE,

    constraint absence_chk check (absent_date=trunc(absent_date, 'dd')),

      constraint absence_pk primary key (employee_id, absent_date)

    );

    INSERT INTO emp_attendance (    EMPLOYEE_ID, START_DATE,END_DATE,WEEK_NUMBER)

    WITH dts AS ( 

    SELECT 1, to_date('20210728 13:10:00','YYYYMMDD HH24:MI:SS'),

    to_date('20210728 23:15:00','YYYYMMDD HH24:MI:SS'), 30  FROM dual UNION ALL 

    SELECT 2, to_date('20210728 12:10:10','YYYYMMDD HH24:MI:SS'),

    to_date('20210728 20:15:01','YYYYMMDD HH24:MI:SS'), 30  FROM dual)

   SELECT * FROM dts;

SELECT e.employee_id,

       c.day

FROM   employees e

       INNER JOIN (

         WITH calendar ( start_date, end_date ) AS (

           SELECT DATE '2021-07-01', DATE '2021-07-30' FROM DUAL

         UNION ALL

           SELECT start_date + 1, end_date

           FROM   calendar

           WHERE  start_date + 1 <= end_date

         )

         SELECT start_date AS day

         FROM   calendar

       ) c

       PARTITION BY ( e.employee_id )

       ON (SUBSTR(e.work_days, TRUNC(c.day) - TRUNC(c.day, 'IW') + 1, 1) = 'Y')

WHERE  NOT EXISTS (

         SELECT 1

         FROM   holidays h

         WHERE  c.day = h.holiday_date

       )

AND    NOT EXISTS(

         SELECT 1

         FROM   timeoff t

         WHERE  e.employee_id = t.employee_id

         AND    t.timeoff_date = c.day

       )

ORDER BY

       e.employee_id,

       c.day