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Published

September 13

vr.tr.september-13 · thing-q2848

Let an agent handle September 13 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 13 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 13 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 13, 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 13? 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 13, day 256 (day 257 in leap years) of the year in the Gregorian calendar, with 109 days remaining in both common and leap years. September 13 is the Day of the Programmer in common years, when it is the 256th day, and the anniversary of the Battle of the Plains of Abraham at Quebec in 1759, of the start of the bombardment of Fort McHenry in 1814, of the Attica prison uprising being ended by force in 1971 and of the signing of the first Oslo Accord in Washington in 1993.

Why it exists Filled

Let an agent handle September 13 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The thirteenth 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

  • State that the Day of the Programmer is on September 13 in leap years.
  • Describe the ending of the Attica prison uprising without its loss of life, from reliable sources.
  • Attribute on-this-day events such as the Battle of the Plains of Abraham to September 13 without a source.
  • Mix Julian dates with the Gregorian date without saying so.

Only with a human decision

  • Changing events or deadlines on this date in a shared calendar.

May

  • State the day number of September 13 and convert it between calendars with the calendar named.
  • Explain that the Day of the Programmer falls on September 13 only in common years.

Moral aspects Filled

  • Anniversaries of uprisings and battles involve deaths that deserve accurate, respectful description.
  • Colonial battles such as Quebec 1759 carry different meanings for different communities.

Who is affected

  • Readers relying on dates
  • Families of those killed at Attica
  • Communities in Quebec

Owners Filled

Steward

Nobody owns a date; bodies that declare observances answer for them.

Links to other meta-models Filled

parent

  • Q11185294 - registry parent class

related

  • September - month
  • September 12 - 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-13
  • Wikidata: Q2848 (https://www.wikidata.org/wiki/Q2848)
  • ISO 8601: --09-13 recurring date

Direct properties not applicable Not applicable

  • day of year: 256 or 257 day - common year, leap year where different
  • days remaining: 109 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 13 September or September 13
  • ISO format --09-13
  • 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 Q2848: September 13 - identity and sense of the item
  2. Wikipedia: September 13 - 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-q2848/spec.json