{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.friday","code":"thing-q130","url":"https://ver.cy/models/thing/q130/","name":"Friday","alternateNames":["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"],"kind":"thing","status":"published","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"Cross-cutting context","entryKind":"thing","plane":"XCT","domain":["XCT.TME"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"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.","purpose":"Let an agent handle Friday as a weekday with numbering conventions, legal and working-time rules and named occurrences.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["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"],"structure":{"bundles":[{"id":"calendar","name":"Calendar","description":"Position and numbering.","layers":[{"id":"number","name":"Number","description":"ISO and other conventions.","findings":[{"id":"number-finding","name":"Numbering","description":"Weekday number.","questions":[{"text":"Which number does Friday have in this system?","kind":"definition"},{"text":"Does the week start on Monday or Sunday here?","kind":"boundary"}]}]},{"id":"date","name":"Date","description":"Which occurrence.","findings":[{"id":"date-finding","name":"Occurrence","description":"Specific date.","questions":[{"text":"Which Friday is meant, by date?","kind":"definition"},{"text":"Was the weekday computed correctly for historical calendars?","kind":"boundary"}]}]}]},{"id":"work","name":"Work","description":"Working patterns.","layers":[{"id":"status","name":"Working status","description":"Working day or weekend.","findings":[{"id":"status-finding","name":"Status","description":"Working status.","questions":[{"text":"Is Friday a working day or part of the weekend here?","kind":"boundary"},{"text":"Which sectors differ?","kind":"boundary"}]}]},{"id":"hours","name":"Hours","description":"Opening and trading.","findings":[{"id":"hours-finding","name":"Hours","description":"Opening hours.","questions":[{"text":"Which trading or opening rules apply on this day?","kind":"boundary"},{"text":"Are public services open?","kind":"definition"}]}]}]},{"id":"named","name":"Named occurrences","description":"Special days.","layers":[{"id":"names","name":"Names","description":"Named days.","findings":[{"id":"names-finding","name":"Named days","description":"Named occurrences.","questions":[{"text":"Which named Fridays fall this year?","kind":"measurement"},{"text":"What do they mark?","kind":"definition"}]}]},{"id":"customs","name":"Customs","description":"Observances and superstitions.","findings":[{"id":"customs-finding","name":"Customs","description":"Customs.","questions":[{"text":"Which customs or observances are tied to this day?","kind":"definition"},{"text":"Do they vary by culture?","kind":"boundary"}]}]}]},{"id":"deadlines","name":"Deadlines","description":"Scheduling and law.","layers":[{"id":"scheduling","name":"Scheduling","description":"Time zones.","findings":[{"id":"scheduling-finding","name":"Scheduling","description":"Scheduling across zones.","questions":[{"text":"Across time zones, is it still Friday for all participants?","kind":"boundary"},{"text":"How should the schedule be shown?","kind":"action"}]}]},{"id":"legal","name":"Legal deadlines","description":"Counting days.","findings":[{"id":"legal-finding","name":"Deadlines","description":"Deadline rules.","questions":[{"text":"How do legal deadlines treat this day?","kind":"boundary"},{"text":"Is it a business day?","kind":"boundary"}]}]}]}]},"agentConduct":{"may":["Calculate Fridays across calendars and ISO weeks.","Schedule while noting Friday prayer and weekend customs where relevant."],"mustNot":["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."],"requiresHuman":["Requiring people to work during religious observance."]},"ethics":{"considerations":["Friday is a day of prayer for Muslims and a weekend day in some countries.","Scheduling across cultures needs care."],"affectedParties":["Workers","Worshippers"]},"owners":{"steward":"Nobody: a calendar day held in common.","roles":[],"masterSystems":[]},"relations":[{"target":"Q1445650","type":"parent","note":"registry parent class"},{"target":"Q573","type":"parent","note":"registry parent class"},{"target":"Q819073","type":"parent","note":"registry parent class"},{"target":"day","type":"related","note":"weekday"},{"target":"week","type":"related","note":"seven days"},{"target":"working time and trading law","type":"related","note":"rules"},{"target":"calendar date","type":"related","note":"dates fall on weekdays"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.friday","Wikidata: Q130 (https://www.wikidata.org/wiki/Q130)","ISO 8601 weekday number: 5 Monday is 1"]},"properties":{"applicability":"not-applicable","items":[]},"recognition":{"applicability":"optional","items":["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":{"applicability":"required","items":["schedule around it","number it, as day 5 in ISO 8601","apply working-time and trading rules to it","identify named occurrences"]},"hazards":{"applicability":"required","items":["Week-start mismatches in software","Assuming the weekend is the same everywhere","Mis-computed day of week for historical dates"]},"interfaces":{"applicability":"required","items":["ISO 8601","Trading-hours law and religious holiday law","Working time law"]},"context":{"applicability":"required","items":["Scheduling, work patterns, trading hours and observances.","ordinary occurrences","named occurrences such as Good Friday and Black Friday"]}},"sources":[{"title":"Wikidata item Q130: Friday","url":"https://www.wikidata.org/wiki/Q130","note":"identity and sense of the item"},{"title":"Wikipedia: Friday","url":"https://en.wikipedia.org/wiki/Friday","note":"general description of the item"}],"openQuestions":["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?"],"resources":{"spec":"/models/things/publications/thing-q130/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q130/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T05:41:46Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-06T19:51:54+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass","interaction.properties":"Plane XCT: no invented physical properties."},"score":1.0}}