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Published

Friday

vr.tr.friday · thing-q130

Let an agent handle Friday as a weekday with numbering conventions, legal and working-time rules and named occurrences.

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

Calendar Position and numbering.

Number

ISO and other conventions.

Numbering

Weekday number.

  1. Which number does Friday have in this system? definition
  2. Does the week start on Monday or Sunday here? boundary

Date

Which occurrence.

Occurrence

Specific date.

  1. Which Friday is meant, by date? definition
  2. Was the weekday computed correctly for historical calendars? boundary
Work Working patterns.

Working status

Working day or weekend.

Status

Working status.

  1. Is Friday a working day or part of the weekend here? boundary
  2. Which sectors differ? boundary

Hours

Opening and trading.

Hours

Opening hours.

  1. Which trading or opening rules apply on this day? boundary
  2. Are public services open? definition
Named occurrences Special days.

Names

Named days.

Named days

Named occurrences.

  1. Which named Fridays fall this year? measurement
  2. What do they mark? definition

Customs

Observances and superstitions.

Customs

Customs.

  1. Which customs or observances are tied to this day? definition
  2. Do they vary by culture? boundary
Deadlines Scheduling and law.

Scheduling

Time zones.

Scheduling

Scheduling across zones.

  1. Across time zones, is it still Friday for all participants? boundary
  2. How should the schedule be shown? action

Legal deadlines

Counting days.

Deadlines

Deadline rules.

  1. How do legal deadlines treat this day? boundary
  2. Is it a business day? boundary

Classifiers Filled

Family
Thing Registry
Category
Cross-cutting context
Entry kind
thing
Plane
XCT
Domain
XCT.TME
Other names and narrower kinds
Black Friday, Friday the 17th, Brown Friday, 10 January 1800, June 12, 1914, June 5, 1914, 3 January 1800, February 2, 1810, September 20, 1907, 30 November 1821, Friday the 13th, March 3, 1837

What it is Filled

The day of the week between Thursday and Saturday, day 5 in ISO 8601 weeks; a day of congregational prayer in Islam and the last working day in many countries.

Why it exists Filled

Let an agent handle Friday as a weekday with numbering conventions, legal and working-time rules and named occurrences.

Distinguishing features Filled

  • Day 5 in ISO weeks; numbering differs in other conventions
  • Working day or weekend depending on country
  • Named occurrences carry commercial or religious meaning
  • Specific dates in the registry aliases are instances, not the weekday

What robots and AI may and may not do Filled

Must not

  • Schedule events that conflict with Friday prayer for people who observe it without asking.
  • Assume Friday is a working day everywhere.
  • Miscompute ISO week days.

Only with a human decision

  • Requiring people to work during religious observance.

May

  • Calculate Fridays across calendars and ISO weeks.
  • Schedule while noting Friday prayer and weekend customs where relevant.

Moral aspects Filled

  • Friday is a day of prayer for Muslims and a weekend day in some countries.
  • Scheduling across cultures needs care.

Who is affected

  • Workers
  • Worshippers

Owners Filled

Steward

Nobody: a calendar day held in common.

Links to other meta-models Filled

parent

  • Q1445650 - registry parent class
  • Q573 - registry parent class
  • Q819073 - registry parent class

related

  • day - weekday
  • week - seven days
  • working time and trading law - rules
  • calendar date - dates fall on weekdays

What else AI and robots need to interact with it Filled

Identity and identifiers required Filled

  • Vercy registry: vr.tr.friday
  • Wikidata: Q130 (https://www.wikidata.org/wiki/Q130)
  • ISO 8601 weekday number: 5 Monday is 1

Direct properties not applicable Not applicable

Not applicable

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Calendar position between Thursday and Saturday
  • ISO 8601 weekday number 5
  • Named occurrences such as Good Friday and Black Friday
  • Not a thing to see; a day on the calendar.

Capabilities and actions required Filled

  • schedule around it
  • number it, as day 5 in ISO 8601
  • apply working-time and trading rules to it
  • identify named occurrences

Hazards and failure modes required Filled

  • Week-start mismatches in software
  • Assuming the weekend is the same everywhere
  • Mis-computed day of week for historical dates

Standards and interfaces required Filled

  • ISO 8601
  • Trading-hours law and religious holiday law
  • Working time law

Context of use required Filled

  • Scheduling, work patterns, trading hours and observances.
  • ordinary occurrences
  • named occurrences such as Good Friday and Black Friday

Sources Filled

  1. Wikidata item Q130: Friday - identity and sense of the item
  2. Wikipedia: Friday - general description of the item

Open questions

  • Should weekdays share one model with parameters?
  • How should named occurrences be linked?
  • The registry entry has merged specific dates as aliases; should they be removed?

Machine files

Card as JSON Specification Card backlog vercy.card/1

Provenance

thing registry research (pass 2) · unreviewed

Built from: models/things/publications/thing-q130/spec.json