{"success":true,"version":"v1","request":{"tool":"calculate_day_of_week","calculator_id":"day-of-week","inputs":{"date":"2026-09-23"},"request_id":"req_5adafa86c4414798983b","received_at":"2026-09-23T23:27:32Z"},"result":{"entity_type":"calculation","id":"calc_day-of-week","calculator_id":"day-of-week","calculator_name":"Day of the Week Calculator","category":"everyday","status":"completed","values":{"weekday":"Wednesday","day_of_year":266,"days_remaining_in_year":99,"iso_week":39,"iso_week_year":2026,"iso_week_date":"2026-W39-3","is_weekend":false,"days_in_year":365},"units":{"days_remaining_in_year":"days"},"formula":"day_of_year = date − 1 January + 1; ISO week: take the Thursday of the same Monday-based week, iso_week = floor((day_of_year(Thursday) − 1) / 7) + 1 and iso_week_year = year of that Thursday","notes":[],"summary":"Weekday: Wednesday; Day of year: 266; Days remaining in year: 99 days; ISO week number: 39; ISO week-based year: 2026; ISO week date: 2026-W39-3; Weekend: false; Days in year: 365"},"warnings":[],"sources":[{"name":"ISO week date (Wikipedia)","url":"https://en.wikipedia.org/wiki/ISO_week_date","type":"reference","retrieved_at":"2026-09-23"},{"name":"ISO 8601 – Date and time format (Wikipedia)","url":"https://en.wikipedia.org/wiki/ISO_8601","type":"reference","retrieved_at":"2026-09-23"}],"freshness":{"type":"daily","max_age_seconds":86400,"note":"Depends on the current date unless the date is supplied."},"cache":{"hit":false,"cacheable":true,"deterministic":false,"max_age_seconds":86400,"note":"Depends on the current date (inputs left at their default 'today'); re-run when the date changes. Explicit inputs make it deterministic."},"timestamp":"2026-09-23T23:27:32Z","duration_ms":0,"next_actions":[{"tool":"calculate_date_difference","calculator_id":"date-difference","reason":"Days and business days between two dates.","url":"https://tttkmbb.com/api/v1/calculate/date-difference","docs":"https://tttkmbb.com/everyday/date-difference.md"},{"tool":"classify_leap_year","calculator_id":"leap-year","reason":"Check whether the year has 366 days.","url":"https://tttkmbb.com/api/v1/calculate/leap-year","docs":"https://tttkmbb.com/everyday/leap-year.md"}],"links":{"self":"https://tttkmbb.com/api/v1/calculate/day-of-week?date=2026-09-23","html":"https://tttkmbb.com/everyday/day-of-week?date=2026-09-23","markdown":"https://tttkmbb.com/everyday/day-of-week.md","schema":"https://tttkmbb.com/api/v1/calculators/day-of-week","openapi":"https://tttkmbb.com/openapi.json","mcp":"https://tttkmbb.com/mcp","task":"https://tttkmbb.com/api/v1/tasks/task_eyJjIjoiZGF5LW9mLXdlZWsiLCJpIjp7ImRhdGUiOiIyMDI2LTA5LTIzIn0sInQiOiIyMDI2LTA5LTIzVDIzOjI3OjMyWiJ9"}}