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Published

April 22

vr.tr.april-22 · thing-q2526

Let an agent handle April 22 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 April 22 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 April 22 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 April 22, 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 April 22? 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

April 22, day 112 (day 113 in leap years) of the year in the Gregorian calendar, with 253 days remaining in both common and leap years. Observances on this date vary by country and tradition; it is Earth Day.

Why it exists Filled

Let an agent handle April 22 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The twenty-second day of April
  • 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 Earth Day or any other observance on April 22 as observed everywhere.
  • Attribute events or births to April 22 without a source.
  • Mix Julian and Gregorian dates for historical events on April 22 without saying so.
  • Use Earth Day as a pretext for unsourced environmental claims.

Only with a human decision

  • Fixing April 22 as a legal or contractual deadline on someone's behalf.

May

  • State that April 22 is day 112 of a common year and day 113 of a leap year in the Gregorian calendar.
  • Mention Earth Day and other observances with the country or body that marks them.
  • Convert April 22 between the Gregorian and Julian calendars with the year given.

Moral aspects Filled

  • Observances on April 22 carry meaning for communities and movements; misattributing them erodes trust.
  • Unsourced on-this-day facts spread errors widely.

Who is affected

  • Readers and students
  • Communities marking the date

Owners Filled

Steward

Nobody: a calendar date held in common.

Links to other meta-models Filled

parent

  • Q11187269 - registry parent class

related

  • April - month
  • April 21 - 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.april-22
  • Wikidata: Q2526 (https://www.wikidata.org/wiki/Q2526)
  • ISO 8601: --04-22 recurring date

Direct properties not applicable Not applicable

  • day of year: 112 or 113 day - common year, leap year where different
  • days remaining: 253 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 22 April or April 22
  • ISO format --04-22
  • 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 Q2526: April 22 - identity and sense of the item
  2. Wikipedia: April 22 - 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-q2526/spec.json