Oracle Scheduler - Oracle 10g/11g Data and Database Management Utilities - page 210

The resulting schedule will include the first day of each month, except January 1st. It
must be pointed out that the FIRST_MONTH_DAY_SCHED schedule is defined to run at
08:00 a.m., meanwhile Jan 1 does not have a defined time.

Excluded dates without a time component are treated as twenty four
hour periods. All timestamps that fall on an excluded date are removed.

Considering the previously detailed expression:

FREQ=MONTHLY;BYMONTHDAY=1;BYHOUR=8;EXCLUDE=JAN_FIRST

All instances of the job are removed for Jan 01.

COMBINED SCHEDULE - EXCLUDE

FIRST_MONTH_DAY_SCHED JAN_FIRST

Feb 1st
Mar 1st

Apr 1st

May 1st
Jul 1st
Sep 1st

Jun 1st
Aug 1st

Jan 1st

Oct 1st

Nov 1st Dec 1st

FREQ=MONTHLY; BYMONTHDAY=1; BYHOUR=8; EXCLUDE=JAN_FIRST

Include scenario
In this scenario two schedules are defined, the first one defines several holidays, and
the second one defines a maintenance schedule that is meant to run every Sunday
and on holidays. If a given date is both a Sunday and a holiday, the scheduled task is
meant to run only once.