{"id":"iso-date-weekday","version":"1.0.0","description":"ISO-8601 weekday number of a strict YYYY-MM-DD date (Monday=1 ... Sunday=7).","supported_operations":["iso date weekday","day of week iso","iso weekday number"],"unsupported_operations":["locale weekday names","Sunday-first","timezones"],"semantics":["Strict YYYY-MM-DD as above. Return weekday 1=Monday .. 7=Sunday.","Do not return English or other locale names.","Do not use local Date. Compute from a known civil epoch (proleptic Gregorian 0001-01-01 is Monday, ISO 1)."],"limits":{"year_min":1,"year_max":9999},"pricing":{"status":"unpriced","charge_usd":null},"input_schema":{"type":"object","additionalProperties":false,"required":["date"],"properties":{"date":{"type":"string","minLength":10,"maxLength":10}}},"output_schema":{"type":"object","additionalProperties":false,"required":["weekday"],"properties":{"weekday":{"type":"integer","minimum":1,"maximum":7}}},"examples":[{"input":{"date":"1970-01-01"},"output":{"weekday":4}},{"input":{"date":"0001-01-01"},"output":{"weekday":1}},{"input":{"date":"2026-09-10"},"output":{"weekday":4}}],"execute_url":"/v1/tools/iso-date-weekday/versions/1.0.0/execute"}