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Published

September 4

vr.tr.september-4 · thing-q2855

Let an agent handle September 4 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 4 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 4 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 4, 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 4? 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 4, day 247 (day 248 in leap years) of the year in the Gregorian calendar, with 118 days remaining in both common and leap years. September 4 is observed as a national or memorial day in some countries and marks the founding of Los Angeles in 1781.

Why it exists Filled

Let an agent handle September 4 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The fourth 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 national or memorial observances on September 4 as universal.
  • Publish on-this-day events for September 4 without a source.
  • Mix Julian and Gregorian dates for events placed on September 4.
  • Present founding anniversaries of cities without mention of earlier Indigenous inhabitants when asked about history.

Only with a human decision

  • Scheduling public events on September 4 in places where it is a day of remembrance.

May

  • State the day number of September 4 in common and leap years.
  • List observances on September 4, such as the founding of Los Angeles, with sources.
  • Convert September 4 dates between Julian and Gregorian calendars where relevant.

Moral aspects Filled

  • Founding dates mark settlement on lands already inhabited.
  • Wrong dates attached to historical events spread quickly through on-this-day lists.

Who is affected

  • Readers relying on dates
  • Indigenous communities
  • People marking memorials

Owners Filled

Steward

Nobody: a calendar date held in common; national authorities set observances.

Links to other meta-models Filled

parent

  • Q11187901 - registry parent class

related

  • September - month
  • September 3 - 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-4
  • Wikidata: Q2855 (https://www.wikidata.org/wiki/Q2855)
  • ISO 8601: --09-04 recurring date

Direct properties not applicable Not applicable

  • day of year: 247 or 248 day - common year, leap year where different
  • days remaining: 118 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 4 September or September 4
  • ISO format --09-04
  • 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 Q2855: September 4 - identity and sense of the item
  2. Wikipedia: September 4 - 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-q2855/spec.json