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Published

December 20

vr.tr.december-20 · thing-q2455

Let an agent handle December 20 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 20 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 20 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 20, 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 20? 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 20, day 354 (day 355 in leap years) of the year in the Gregorian calendar, with 11 days remaining in both common and leap years. December 20 is International Human Solidarity Day, observed by the United Nations, and the anniversary of the formal transfer of Louisiana to the United States in New Orleans in 1803, South Carolina s secession in 1860 and the handover of Macau to China in 1999.

Why it exists Filled

Let an agent handle December 20 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The twentieth 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

  • Use solidarity day messaging to solicit donations for causes that are not genuine.
  • Confuse December 20 with the solstice date, which varies by year and time zone.
  • Present one country's December 20 observance as universal.

Only with a human decision

  • Fixing a legally binding deadline on December 20.

May

  • State December 20's day number and remaining days correctly for common and leap years.
  • Name International Human Solidarity Day on December 20, citing the United Nations.

Moral aspects Filled

  • Solidarity appeals attract scams that exploit people's generosity.

Who is affected

  • People relying on dates
  • Donors

Owners Filled

Steward

Nobody owns a date; the United Nations designates international days.

Links to other meta-models Filled

parent

  • Q11187215 - registry parent class

related

  • December - month
  • December 19 - 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-20
  • Wikidata: Q2455 (https://www.wikidata.org/wiki/Q2455)
  • ISO 8601: --12-20 recurring date

Direct properties not applicable Not applicable

  • day of year: 354 or 355 day - common year, leap year where different
  • days remaining: 11 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 20 December or December 20
  • ISO format --12-20
  • 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 Q2455: December 20 - identity and sense of the item
  2. Wikipedia: December 20 - 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-q2455/spec.json