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Published

April 28

vr.tr.april-28 · thing-q2534

Let an agent handle April 28 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 28 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 28 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 28, 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 28? 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 28, day 118 (day 119 in leap years) of the year in the Gregorian calendar, with 247 days remaining in both common and leap years. Observances on this date vary by country and tradition; it is the World Day for Safety and Health at Work.

Why it exists Filled

Let an agent handle April 28 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The twenty-eighth 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 a national or religious observance on April 28 as universal.
  • Report events on April 28 without a source.
  • Mix Julian and Gregorian dates when giving historical events on April 28.
  • Trivialize workplace deaths and injuries marked on April 28.

Only with a human decision

  • Publishing remembrance of named workers who died at work.

May

  • Compute the weekday of April 28 in any given year.
  • Name April 28 as the World Day for Safety and Health at Work and explain its purpose.
  • List other observances on April 28 with the country or tradition that holds each.

Moral aspects Filled

  • April 28 marks workers killed and injured at work, whose memory deserves respect.
  • Lists of events can favour some countries and forget others.

Who is affected

  • Workers and their families
  • Readers of calendars

Owners Filled

Steward

Nobody owns it; the Gregorian calendar is held in common.

Links to other meta-models Filled

parent

  • Q11187366 - registry parent class

related

  • April - month
  • April 27 - 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-28
  • Wikidata: Q2534 (https://www.wikidata.org/wiki/Q2534)
  • ISO 8601: --04-28 recurring date

Direct properties not applicable Not applicable

  • day of year: 118 or 119 day - common year, leap year where different
  • days remaining: 247 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 28 April or April 28
  • ISO format --04-28
  • 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 Q2534: April 28 - identity and sense of the item
  2. Wikipedia: April 28 - 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-q2534/spec.json