{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.thursday","code":"thing-q129","url":"https://ver.cy/models/thing/q129/","name":"Thursday","alternateNames":["Thursday the 20th","Easter Thursday","October 10, 1907","10 September 1896","June 11, 1914","2 January 1800","9 January 1800","February 4, 1909","March 16, 1837","March 22, 1832","June 4, 1914","June 18, 1914"],"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 Wednesday and Friday, day 4 in ISO 8601 weeks; the day on which the ISO week-numbering year is anchored, since week 1 contains the first Thursday.","purpose":"Let an agent handle Thursday as a weekday with numbering conventions, legal and working-time rules and named occurrences.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Day 4 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 Thursday 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 Thursday 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 Thursday 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 Thursdays 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 Thursday 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 Thursdays across calendars and ISO weeks.","Use the first Thursday rule correctly when computing ISO week numbers."],"mustNot":["Miscompute ISO week numbers by ignoring the Thursday rule.","Assume all calendars number weeks the same way.","Present a date's weekday without checking the calendar in use."],"requiresHuman":["Changing week-numbering conventions in shared schedules or payroll."]},"ethics":{"considerations":["Week-number errors shift deadlines, pay periods and deliveries.","Calendar conventions differ across cultures."],"affectedParties":["Schedulers","Workers paid by week"]},"owners":{"steward":"Nobody: a calendar day held in common.","roles":[],"masterSystems":[]},"relations":[{"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.thursday","Wikidata: Q129 (https://www.wikidata.org/wiki/Q129)","ISO 8601 weekday number: 4 Monday is 1"]},"properties":{"applicability":"not-applicable","items":[]},"recognition":{"applicability":"optional","items":["Calendar position between Wednesday and Friday","ISO 8601 weekday number 4","Named occurrences such as Maundy Thursday and Thanksgiving in the United States","Not a thing to see; a day on the calendar."]},"capabilities":{"applicability":"required","items":["schedule around it","number it, as day 4 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","Public holiday law","Working time law"]},"context":{"applicability":"required","items":["Scheduling, work patterns, trading hours and observances.","ordinary occurrences","named occurrences such as Maundy Thursday and Thanksgiving in the United States"]}},"sources":[{"title":"Wikidata item Q129: Thursday","url":"https://www.wikidata.org/wiki/Q129","note":"identity and sense of the item"},{"title":"Wikipedia: Thursday","url":"https://en.wikipedia.org/wiki/Thursday","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-q129/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q129/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}}