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Published

September 19

vr.tr.september-19 · thing-q2896

Let an agent handle September 19 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 September 19 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 September 19 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 September 19, 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 September 19? 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

September 19, day 262 (day 263 in leap years) of the year in the Gregorian calendar, with 103 days remaining in both common and leap years. September 19 is Independence Day in Saint Kitts and Nevis marking 1983, Army Day in Chile, and the anniversary of women gaining the vote in New Zealand in 1893 and of the Mexico City earthquakes of 1985 and 2017, which struck on the same date 32 years apart.

Why it exists Filled

Let an agent handle September 19 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The nineteenth day of September
  • 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 holiday of a small state as if it were a global observance, or omit it as unimportant.
  • Give on-this-day facts without a source.
  • Mix calendar systems when dating historical events on September 19.

Only with a human decision

  • Fixing official or contractual dates in a country where it is a public holiday.

May

  • Compute the weekday and day of year for September 19 in a given year.
  • List September 19 observances such as Independence Day in Saint Kitts and Nevis, naming the country.

Moral aspects Filled

  • Small states' national days deserve the same accuracy as those of large states.
  • Wrong dates can disrupt travel, legal deadlines or appointments.

Who is affected

  • People of Saint Kitts and Nevis
  • People with deadlines that day

Owners Filled

Steward

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

Links to other meta-models Filled

parent

  • Q11186284 - registry parent class

related

  • September - month
  • September 18 - 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.september-19
  • Wikidata: Q2896 (https://www.wikidata.org/wiki/Q2896)
  • ISO 8601: --09-19 recurring date

Direct properties not applicable Not applicable

  • day of year: 262 or 263 day - common year, leap year where different
  • days remaining: 103 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 19 September or September 19
  • ISO format --09-19
  • 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 Q2896: September 19 - identity and sense of the item
  2. Wikipedia: September 19 - 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-q2896/spec.json