February
Let an agent describe February as a calendar month, relay its length in common and leap years, position, seasons and notable observances, explain its name and the leap day, and route date-specific questions to entries for individual days.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Calendar February in the calendar.
Position
Position and length.
Position
Position.
- Where does February fall, and how many days does it have in a given year? definition
- Is the question about the Gregorian February or another calendar? boundary
Leap
Leap years.
Leap
Leap.
- How do the Gregorian leap year rules decide whether February has 29 days? definition
- Which entry fits leap year? action
Observances Observances.
International
International and cultural days.
International
International.
- What observances fall in February, such as Valentine Day, World Cancer Day and Black History Month? provenance
- Which entry fits the specific observance? action
Movable
Movable feasts.
Movable
Movable.
- Which movable observances such as Lunar New Year and Carnival often fall in February, with sources? provenance
- Which sources are cited? provenance
Seasons Seasons and nature.
Seasons
Seasons.
Seasons
Seasons.
- What is the season in February in each hemisphere, and what weather is typical? provenance
- Which entry fits winter? action
History
Name and Roman origins.
History
History.
- How did February get its name and its short length in the Roman calendar? provenance
- Which references are standard? provenance
Context Culture and technology.
Culture
Culture.
Culture
Culture.
- How does February appear in literature, proverbs and traditions? provenance
- Which entry fits the specific tradition? action
Software
Leap day in software.
Software
Software.
- What software problems arise around 29 February, and how are they avoided? provenance
- Which entry fits leap year bug? action
Classifiers Filled
- Family
- Thing Registry
- Category
- Information and virtual systems
- Entry kind
- thing
- Plane
- INF
- Domain
- INF.KNW
- Other names and narrower kinds
- Veguary
What it is Filled
The second month of the year in the Julian and Gregorian calendars and the shortest, with 28 days in common years and 29 in leap years, following January and preceding March, falling in winter in the northern hemisphere and summer in the southern, named from the Roman purification festival Februa, and containing observances such as Valentine Day on 14 February, Black History Month in the United States and Canada, and Lunar New Year in many years.
Why it exists Filled
Let an agent describe February as a calendar month, relay its length in common and leap years, position, seasons and notable observances, explain its name and the leap day, and route date-specific questions to entries for individual days.
Distinguishing features Filled
- Shortest month
- Leap day on 29 February
- Winter month in the north
- Purification festival origin
What robots and AI may and may not do Filled
Must not
- Accept February 30 or February 29 in a common year as a valid date.
- Calculate monthly charges or interest for February without stating how the short month is handled.
- Silently move a February 29 anniversary or deadline to another day.
Only with a human decision
- Choosing how a February 29 date applies in a non-leap year for contracts or birthdays with legal effect.
May
- State the number of days in February for a given year using the leap-year rule.
- Validate dates so that February 29 is accepted only in leap years.
- Schedule recurring February events with a stated rule for non-leap years.
Moral aspects Filled
- Software bugs around February 29 have disrupted payments and systems.
- People born on February 29 are often mishandled by forms and records.
Who is affected
- People born on February 29
- Account holders and payers
- Users of date-dependent systems
Owners Filled
Steward
The public: held in common; the calendar is maintained by convention and civil law.
Links to other meta-models Filled
parent
- Q18602249 - registry parent class
related
- month of the Gregorian calendar - in registry terms
- January - the first month
- March - the third month
contains
- leap day - on 29 February in leap years
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.february
- Wikidata: Q109 (https://www.wikidata.org/wiki/Q109)
- ISO 8601: 02 month number
Direct properties not applicable Not applicable
- days: 28 or 29 count - leap years have 29
- position: 2 month - Gregorian calendar
- starts on same weekday as: March and November months - in common years
Plane INF: no invented physical properties.
Recognition optional Filled
- Second month, 28 or 29 days
- Between January and March, winter in the north
- Februarius was the last month of the early Roman year
- Not a visible object; a page of the calendar.
Capabilities and actions required Filled
- relay length and leap years
- relay observances and seasons
- explain name and history
- route to specific days
Hazards and failure modes required Filled
- Leap year calculation errors
- Software bugs around 29 February
- Confusing observance dates across countries
Standards and interfaces required Filled
- ISO 8601 date representation
- Gregorian leap year rules
- National public holiday laws for February observances
Context of use required Filled
- Not applicable; a calendar month.
- February in common years
- February in leap years
- February in the Julian and Gregorian calendars
- February in other calendar traditions and names
- observances in February
Sources Filled
- Wikidata item Q109: February - identity and sense of the item
- Wikipedia: February - general description of the item
Open questions
- Should leap day be the primary linked entry?
- How should observances be linked through day entries?
- How should names of February in other languages be recorded?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q109/spec.json