January 13
Let an agent handle January 13 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Date Calendar facts.
Weekday
Computation.
Weekday
Weekday.
- On which weekday does January 13 fall in this year? measurement
- Is it a leap year? boundary
Calendar
Julian or Gregorian.
Calendar
Calendar system.
- Is the Julian or Gregorian calendar meant? boundary
- What is the equivalent date in the other calendar? measurement
Observances Holidays.
Holiday
Public holiday.
Holiday
Holiday status.
- Is January 13 a public holiday or observance here? provenance
- Which tradition or law sets it? provenance
Attribution
Traditions.
Attribution
Attributed observances.
- Which communities observe something on this date, according to them? provenance
- Is the observance attributed rather than assumed? boundary
History Past events.
Events
On this day.
Events
Historical events.
- Which notable events happened on January 13, according to reliable sources? provenance
- Are dates given in the same calendar? boundary
Anniversaries
Recurring.
Anniversaries
Anniversaries.
- Which anniversaries fall on this date this year? provenance
- Which are round numbers? measurement
Planning Scheduling.
Countdown
Days until.
Countdown
Countdown.
- How many days until the next January 13? measurement
- From which date? definition
Work
Working day.
Work
Working day.
- Is it a working day for this organisation? provenance
- 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
January 13, day 13 of the year in the Gregorian calendar, with 352 days remaining (353 in leap years). In communities that keep the Old New Year by the Julian calendar, the eve of that holiday falls on this date.
Why it exists Filled
Let an agent handle January 13 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.
Distinguishing features Filled
- The thirteenth day of January
- 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 a single tradition's meaning of the date as universal.
- Confuse Gregorian and Julian dates in records or events.
- Attribute events to the date without a source.
Only with a human decision
- Rescheduling events or deadlines across calendar systems.
May
- State calendar facts about January 13 and the observances linked to it, citing sources.
- Note that in the Julian calendar it falls on another day and that Old New Year is kept on a different date.
Moral aspects Filled
- Holidays matter to the communities that keep them.
- Date mistakes between calendars can cause legal and historical errors.
Who is affected
- Communities that observe holidays
- Readers of records
Owners Filled
Steward
Nobody: a calendar date held in common.
Links to other meta-models Filled
parent
- Q11185294 - registry parent class
related
- January - month
- January 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.january-13
- Wikidata: Q2255 (https://www.wikidata.org/wiki/Q2255)
- ISO 8601: --01-13 recurring date
Direct properties not applicable Not applicable
- day of year: 13 day
- days remaining: 352 or 353 days - common or leap year
Plane XCT: no invented physical properties.
Recognition optional Filled
- Written 13 January or January 13
- ISO format --01-13
- 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 religious 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
- Wikidata item Q2255: January 13 - identity and sense of the item
- Wikipedia: January 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
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q2255/spec.json