February 15
Let an agent handle February 15 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 February 15 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 February 15 a public holiday or observance here? provenance
- Which tradition or law sets it? provenance
Attribution
Traditions.
Attribution
Attributed observances.
- Which countries or 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 February 15, 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 February 15? 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
February 15, day 46 of the year in the Gregorian calendar, with 319 days remaining (320 in leap years). It is marked in Canada as National Flag of Canada Day.
Why it exists Filled
Let an agent handle February 15 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.
Distinguishing features Filled
- The fifteenth 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
- Present a national observance as universal.
- Report on-this-day events without a source.
- Mix Julian and Gregorian dates without saying so.
Only with a human decision
- Publishing historical claims tied to this date for a public audience.
May
- Report observances such as National Flag of Canada Day with sources.
- Convert this date between calendars, stating the calendar used.
Moral aspects Filled
- National symbols carry meaning for citizens and deserve respect.
Who is affected
- Readers and students
- Communities who mark the date
Owners Filled
Steward
Nobody owns a date; it belongs to the Gregorian calendar.
Links to other meta-models Filled
parent
- Q11185379 - registry parent class
related
- February - month
- February 14 - 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-15
- Wikidata: Q2334 (https://www.wikidata.org/wiki/Q2334)
- ISO 8601: --02-15 recurring date
Direct properties not applicable Not applicable
- day of year: 46 day
- days remaining: 319 or 320 days - common or leap year
Plane XCT: no invented physical properties.
Recognition optional Filled
- Written 15 February or February 15
- ISO format --02-15
- 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
- Wikidata item Q2334: February 15 - identity and sense of the item
- Wikipedia: February 15 - 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-q2334/spec.json