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Published

February 20

vr.tr.february-20 · thing-q2344

Let an agent handle February 20 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 February 20 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 February 20 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 February 20, 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 February 20? 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

February 20, day 51 of the year in the Gregorian calendar, with 314 days remaining (315 in leap years). It is marked by the United Nations as World Day of Social Justice.

Why it exists Filled

Let an agent handle February 20 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The twentieth day of February
  • 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

  • Attribute an observance or historical event to February 20 without a source.
  • Present one country's or organization's observance as universal for the date.
  • Mix up calendar systems or time zones so that deadlines fall on the wrong day.

Only with a human decision

  • Setting legal or contractual deadlines that fall on the date.

May

  • Report what day of the year February 20 is and list observances on it with their sources.
  • Use February 20 correctly in schedules, reminders and date calculations.

Moral aspects Filled

  • Its observance on social justice should be described accurately, not used as a slogan.
  • Errors in dates can cause missed deadlines with legal or financial consequences.

Who is affected

  • People who mark the date
  • People relying on scheduled deadlines

Owners Filled

Steward

Nobody owns a date; the Gregorian calendar is held in common.

Links to other meta-models Filled

parent

  • Q11187215 - registry parent class

related

  • February - month
  • February 19 - 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.february-20
  • Wikidata: Q2344 (https://www.wikidata.org/wiki/Q2344)
  • ISO 8601: --02-20 recurring date

Direct properties not applicable Not applicable

  • day of year: 51 day
  • days remaining: 314 or 315 days - common or leap year

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 20 February or February 20
  • ISO format --02-20
  • 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 Q2344: February 20 - identity and sense of the item
  2. Wikipedia: February 20 - 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-q2344/spec.json