Adding time using PL/SQL

How can I add time to time using PL/SQL?
If your time is stored in a table in a column of DATE data type, you can do the following:

For example, say you want to add 1 hour and 30 minutes to your new time. You can do the following:

1 hour and 30 minutes is equal to 3600 + 1800 = 5400 seconds.

 DECLARE my_date_var DATE := null; time_to_add NUMBER := 5400 ; -- Between 0 and 86399 and whatever value you -- need to add BEGIN SELECT DATE_FIELD INTO my_date_var FROM my_time_table WHERE MY_ID = 
 
  ;

 

-- Set your values for time_to_add

IF time_to_add is between 0 and 86399 THEN
My_date_var := to_date(to_char(my_date_var, 'SSSSS') + time_to_add, 'SSSSS')
END IF;
...

-- UPDATE my_time_table or whatever business logic you need to process
...

END;