← Back to catalogue
Published

December 27

vr.tr.december-27 · thing-q2800

Let an agent handle December 27 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 27 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 27 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 27, 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 27? 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 27, day 361 (day 362 in leap years) of the year in the Gregorian calendar, with 4 days remaining in both common and leap years. December 27 falls in the Christmas season in many countries and is the feast of Saint John the Evangelist in Western Christian calendars.

Why it exists Filled

Let an agent handle December 27 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The twenty-seventh 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

  • Present the Christmas season observances of December 27 as universal to all cultures and faiths.
  • Publish on-this-day events for December 27 without a source.
  • Mix Julian and Gregorian dates when placing a historical event on December 27.
  • Schedule work for staff on December 27 without checking local public holidays and leave.

Only with a human decision

  • Setting a deadline or binding date on December 27 where holidays may affect the people involved.

May

  • State the day number of December 27 in common and leap years.
  • List observances on December 27, such as the feast of Saint John the Evangelist, naming the tradition that keeps them.
  • Convert December 27 between the Gregorian and Julian calendars and say which one it means.

Moral aspects Filled

  • December 27 is a holiday for some and an ordinary working day for others; assuming one view excludes people.
  • Wrong dates attached to historical events spread quickly through on-this-day lists.

Who is affected

  • Readers relying on dates
  • People of other calendars and faiths
  • Workers in the holiday season

Owners Filled

Steward

Nobody: a calendar date held in common; national authorities set public holidays.

Links to other meta-models Filled

parent

  • Q11187356 - registry parent class

related

  • December - month
  • December 26 - 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-27
  • Wikidata: Q2800 (https://www.wikidata.org/wiki/Q2800)
  • ISO 8601: --12-27 recurring date

Direct properties not applicable Not applicable

  • day of year: 361 or 362 day - common year, leap year where different
  • days remaining: 4 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 27 December or December 27
  • ISO format --12-27
  • 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 Q2800: December 27 - identity and sense of the item
  2. Wikipedia: December 27 - 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-q2800/spec.json