PL/SQL :: How To Run A Scheduler Using Scheduled Time

-- Scheduler details

BEGIN
dbms_scheduler.create_schedule( 
schedule_name  => 'INTERVAL_EVERY_1_MINUTES', 
start_date    => trunc(sysdate)+18/24, 
repeat_interval => 'freq=MINUTELY;interval=1', 
comments     => 'Runtime: Every day all 1 minutes'); 
END;-- program code
BEGIN     

[code]....

all above three code compiled successfully . but it is not running automatically and not run every 1 minute.

I try to run this manuall by using following code

BEGIN
dbms_scheduler.run_job('JOB_FEED_UK_DATA',TRUE);
END;

It works fine..

create or replace
PROCEDURE LOAD_CUSTOMERS_UK
IS
BEGIN
  Insert into CUSTOMERS_UK (ID, NAME, CITY)  VALUES (1,'SMITH','LONDON');
  Insert into CUSTOMERS_UK (ID, NAME, CITY)  VALUES (2,'JONES','LONDON');
  Insert into CUSTOMERS_UK (ID, NAME, CITY)  VALUES (3,'BROWN','BRIGHTON');

[code]....