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Published

May 18

vr.tr.may-18 · thing-q2576

Let an agent handle May 18 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 18 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 18 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 18, 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 18? 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 18, day 138 (day 139 in leap years) of the year in the Gregorian calendar, with 227 days remaining in both common and leap years. May 18 is International Museum Day, Flag and Universities Day in Haiti, and the anniversary of the 1980 eruption of Mount St. Helens and of the start of the Gwangju uprising in South Korea in 1980.

Why it exists Filled

Let an agent handle May 18 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The eighteenth 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

  • Mix up the meaning of May 18 in different countries, such as Haiti's Flag and Universities Day.
  • Trivialise commemorations of violence that fall on May 18.
  • Attribute events to May 18 without a source.
  • Treat May 18 as a public holiday where it is not one.

Only with a human decision

  • Choosing May 18 for an event aimed at communities who mark it as a national day.

May

  • Give the day number of May 18 and list its observances from reliable sources.
  • Share information on International Museum Day events from the museums involved.

Moral aspects Filled

  • Several countries mark national and memorial days on May 18 that carry pain and pride.
  • Museums use the day to widen access to culture, which should be described fairly.

Who is affected

  • Communities marking the date
  • Museum visitors

Owners Filled

Steward

Nobody owns a date; each observance belongs to the state or body that keeps it.

Links to other meta-models Filled

parent

  • Q11185474 - registry parent class

related

  • May - month
  • May 17 - 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-18
  • Wikidata: Q2576 (https://www.wikidata.org/wiki/Q2576)
  • ISO 8601: --05-18 recurring date

Direct properties not applicable Not applicable

  • day of year: 138 or 139 day - common year, leap year where different
  • days remaining: 227 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 18 May or May 18
  • ISO format --05-18
  • 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 Q2576: May 18 - identity and sense of the item
  2. Wikipedia: May 18 - 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-q2576/spec.json