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Published

December 19

vr.tr.december-19 · thing-q2451

Let an agent handle December 19 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 December 19 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 December 19 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 December 19, 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 December 19? 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

December 19, day 353 (day 354 in leap years) of the year in the Gregorian calendar, with 12 days remaining in both common and leap years. December 19 is the anniversary of the publication of Charles Dickens s A Christmas Carol in 1843, of the splashdown of Apollo 17 in 1972, which ended the last crewed Moon mission to date, and of the impeachment of US President Bill Clinton by the House of Representatives in 1998.

Why it exists Filled

Let an agent handle December 19 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The nineteenth day of December
  • 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 December 19 dates from Julian-calendar records as Gregorian without conversion.
  • Schedule year-end deadlines on December 19 without checking holiday closures in the place concerned.
  • Attribute an event to December 19 without checking the time zone where it happened.

Only with a human decision

  • Fixing a legally binding year-end deadline on December 19.

May

  • State December 19's day number and remaining days correctly for common and leap years.
  • Name anniversaries on December 19, such as the publication of A Christmas Carol, from reliable sources.

Moral aspects Filled

  • Mid-December falls in religious holiday seasons that communities observe differently.

Who is affected

  • People relying on dates
  • Communities observing December holidays

Owners Filled

Steward

Nobody owns a date; calendar authorities and states set official observances.

Links to other meta-models Filled

parent

  • Q11186284 - registry parent class

related

  • December - month
  • December 18 - 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.december-19
  • Wikidata: Q2451 (https://www.wikidata.org/wiki/Q2451)
  • ISO 8601: --12-19 recurring date

Direct properties not applicable Not applicable

  • day of year: 353 or 354 day - common year, leap year where different
  • days remaining: 12 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 19 December or December 19
  • ISO format --12-19
  • 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 Q2451: December 19 - identity and sense of the item
  2. Wikipedia: December 19 - 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-q2451/spec.json