After you create an oracle job, you may need to edit it.
Oracle provides a procedures for the same.
Eg: to change the next time a job is to be run,
dbms_job.next_date(
job IN BINARY_INTEGER,
next_date IN DATE);
Log in as the user who owns the job and execute a commit after the operation.
ref: http://www.psoug.org/reference/dbms_job.html
