Omit Run Dates: Calendars vs Date Objects

We want to shift our processing to use calendars instead of date objects.
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We have mastered using "Run" and "Omit" Date objects to control our monthly processing-- we 'include' certain jobs and 'omit' certain others. The "Run" and "Omit" Date Objects list the same dates (although why we can't use the -same- date object to "Run" some jobs and "Omit" others is a mystery).
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To shift to Calendars I plan to use the "DAYNO" to control jobs-- some jobs will only run on "Month End Day" (DAYNO = 1); others run on every day -except- "Month End Day" (Opal program "NOT_MTHEND:" IF DAYMTH EQ 1;SKIP;END). Is DAYMTH the same as DAYNO???
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There are some company holidays when we do not run our full invoicing cycle. We use an Omit date object to mark the jobs to skip on those days.
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What's the best way to mark those jobs to skip on certain days?
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--a) continue to use Date Objects and mark the dates to omit certain jobs
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Are Holidays on a fiscal calendar the same as an Omit Date Object- is execution skipped on those days?
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--b) if Holidays work like an Omit Date Object create 2 calendars-- one with no holidays and one with holidays specified
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Is there an option "c)"?
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Thanks for any assistance!
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--Paul E Musselman