{"id":"iso-date-week-count-in-year","version":"1.0.0","description":"Return the number of ISO-8601 weeks (52 or 53) in an ISO week-numbering year.","supported_operations":["iso date week count in year","iso weeks in year","is 53 week year"],"unsupported_operations":["locale week numbers","Sunday-first weeks","fiscal weeks"],"semantics":["year is a JSON integer 1-9999 and is interpreted as an ISO week-numbering year, which may span parts of two calendar years.","An ISO week-numbering year has 53 weeks when 1 January falls on a Thursday, or when the year is a leap year and 1 January falls on a Wednesday. All other years have 52 weeks."],"limits":{"year_min":1,"year_max":9999},"pricing":{"status":"unpriced","charge_usd":null},"input_schema":{"type":"object","additionalProperties":false,"required":["year"],"properties":{"year":{"type":"integer","minimum":1,"maximum":9999}}},"output_schema":{"type":"object","additionalProperties":false,"required":["weeks"],"properties":{"weeks":{"type":"integer","enum":[52,53]}}},"examples":[{"input":{"year":2026},"output":{"weeks":53}},{"input":{"year":2025},"output":{"weeks":52}}],"execute_url":"/v1/tools/iso-date-week-count-in-year/versions/1.0.0/execute"}