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Published

October 31

vr.tr.october-31 · thing-q2949

Let an agent handle October 31 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Thing Registry Cross-cutting context XCT.TME
Bundle → Layer → Finding → QuestionsClassifiersWhat it isWhy it existsDistinguishing featuresWhat robots and AI may and may not doMoral aspectsOwnersLinks to other meta-modelsIdentity and identifiersDirect propertiesRecognitionCapabilities and actionsHazards and failure modesStandards and interfacesContext of useSources

Bundle → Layer → Finding → Questions Filled

4 bundles · 8 layers · 8 findings · 16 questions

Date Calendar facts.

Weekday

Computation.

Weekday

Weekday.

  1. On which weekday does October 31 fall in this year? measurement
  2. Is it a leap year? boundary

Calendar

Julian or Gregorian.

Calendar

Calendar system.

  1. Is the Julian or Gregorian calendar meant? boundary
  2. What is the equivalent date in the other calendar? measurement
Observances Holidays.

Holiday

Public holiday.

Holiday

Holiday status.

  1. Is October 31 a public holiday or observance here? provenance
  2. Which tradition or law sets it? provenance

Attribution

Traditions.

Attribution

Attributed observances.

  1. Which countries or communities observe something on this date, according to them? provenance
  2. Is the observance attributed rather than assumed? boundary
History Past events.

Events

On this day.

Events

Historical events.

  1. Which notable events happened on October 31, according to reliable sources? provenance
  2. Are dates given in the same calendar? boundary

Anniversaries

Recurring.

Anniversaries

Anniversaries.

  1. Which anniversaries fall on this date this year? provenance
  2. Which are round numbers? measurement
Planning Scheduling.

Countdown

Days until.

Countdown

Countdown.

  1. How many days until the next October 31? measurement
  2. From which date? definition

Work

Working day.

Work

Working day.

  1. Is it a working day for this organisation? provenance
  2. Do deadlines move? boundary

Classifiers Filled

Family
Thing Registry
Category
Cross-cutting context
Entry kind
thing
Plane
XCT
Domain
XCT.TME

What it is Filled

October 31, day 304 (day 305 in leap years) of the year in the Gregorian calendar, with 61 days remaining in both common and leap years. October 31 is Halloween, Reformation Day in Protestant traditions and World Cities Day.

Why it exists Filled

Let an agent handle October 31 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The thirty-first day of October
  • Weekday varies by year
  • Observances vary by place
  • Julian and Gregorian dates differ by 13 days in this era

What robots and AI may and may not do Filled

Must not

  • Treat Halloween customs as universal or impose them on users who do not celebrate.
  • Mock the Reformation or Samhain observances of the people who hold them.
  • Confuse October 31 deadlines across time zones, such as end-of-day filing cut-offs.

Only with a human decision

  • Fixing contractual or filing deadlines that fall on October 31.

May

  • State the day number, observances and anniversaries of October 31 from sources.
  • Note which observances, such as Reformation Day, are public holidays in which places.

Moral aspects Filled

  • October 31 is both a festive and a religious date; different communities read it differently.
  • Many tax and enrolment deadlines fall on month end.

Who is affected

  • Protestant and pagan communities
  • Children and families
  • People with month-end deadlines

Owners Filled

Steward

The public: held in common; observances belong to the communities that keep them.

Links to other meta-models Filled

parent

  • Q11187583 - registry parent class

related

  • October - month
  • October 30 - date
  • calendar date - category
  • ISO 8601 - notation

What else AI and robots need to interact with it Filled

Identity and identifiers required Filled

  • Vercy registry: vr.tr.october-31
  • Wikidata: Q2949 (https://www.wikidata.org/wiki/Q2949)
  • ISO 8601: --10-31 recurring date

Direct properties not applicable Not applicable

  • day of year: 304 or 305 day - common year, leap year where different
  • days remaining: 61 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 31 October or October 31
  • ISO format --10-31
  • Observances vary by country and tradition
  • A date on calendars.

Capabilities and actions required Filled

  • compute its weekday in a given year
  • check local and international observances
  • find sourced historical events
  • schedule events

Hazards and failure modes required Filled

  • Assuming observances are universal
  • Unsourced on-this-day events
  • Mixing Julian and Gregorian dates

Standards and interfaces required Filled

  • ISO 8601
  • National public holiday laws

Context of use required Filled

  • A calendar date for scheduling, holidays and anniversaries.
  • the recurring calendar date
  • specific dated days in given years

Sources Filled

  1. Wikidata item Q2949: October 31 - identity and sense of the item
  2. Wikipedia: October 31 - general description of the item

Open questions

  • Should dated days be separate entries?
  • How should observances be linked?
  • How should events be sourced?

Machine files

Card as JSON Specification Card backlog vercy.card/1

Provenance

thing registry research (pass 2) · unreviewed

Built from: models/things/publications/thing-q2949/spec.json