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Published

May 30

vr.tr.may-30 · thing-q2590

Let an agent handle May 30 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 May 30 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 May 30 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 May 30, 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 May 30? 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

May 30, day 150 (day 151 in leap years) of the year in the Gregorian calendar, with 215 days remaining in both common and leap years. May 30 is the anniversary of the execution of Joan of Arc in Rouen in 1431, the traditional date of Memorial Day in the United States before it moved to the last Monday of May in 1971, Canary Islands Day in Spain, Anguilla Day, and the day Biafra declared independence from Nigeria in 1967.

Why it exists Filled

Let an agent handle May 30 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The thirtieth day of May
  • 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

  • Assign an event to May 30 without checking the calendar used for older dates.
  • Present Memorial Day as falling on May 30 today when it moved in 1971.
  • Use the anniversary of Biafra's declaration to incite ethnic hostility.

Only with a human decision

  • Scheduling actions with legal effect, such as deadlines, on a date that may be a public holiday.

May

  • Convert May 30 between calendars and compute its day number, noting leap years.
  • List events and observances on May 30, such as Canary Islands Day and Anguilla Day, with sources.

Moral aspects Filled

  • Anniversaries such as the execution of Joan of Arc and the Biafran war carry grief and contested memory.
  • Holidays differ by country; assuming one calendar excludes others.

Who is affected

  • Communities marking the date
  • People with deadlines on the date
  • Readers

Owners Filled

Steward

Nobody owns a calendar date; it is held in common.

Links to other meta-models Filled

parent

  • Q11187571 - registry parent class

related

  • May - month
  • May 29 - 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.may-30
  • Wikidata: Q2590 (https://www.wikidata.org/wiki/Q2590)
  • ISO 8601: --05-30 recurring date

Direct properties not applicable Not applicable

  • day of year: 150 or 151 day - common year, leap year where different
  • days remaining: 215 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 30 May or May 30
  • ISO format --05-30
  • 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 Q2590: May 30 - identity and sense of the item
  2. Wikipedia: May 30 - 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-q2590/spec.json