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http://e-words.jp/w/RESTful_API.html
RESTful APIとは、Webシステムを外部から利用するためのプログラムの呼び出し規約（API）の種類の一つで、RESTと呼ばれる設計原則に従って策定されたもの。
curl -s https://worldtimeapi.org/api/timezone/UTC | jq . { "utc_offset": "+00:00", "timezone": "UTC", "day_of_week": 4, "day_of_year": 247, "datetime": "2025-09-04T09:44:22.694198+00:00", "utc_datetime": "2025-09-04T09:44:22.694198+00:00", "unixtime": 1756979062, "raw_offset": 0, "week_number": 36, "dst": false, "abbreviation": "UTC", "dst_offset": 0, "dst_from": null, "dst_until": null, "client_ip": "xxx.xxx.x.xxx" }
curl -s "https://timeapi.io/api/Time/current/zone?timeZone=UTC" | jq . { "year": 2025, "month": 9, "day": 4, "hour": 9, "minute": 48, "seconds": 48, "milliSeconds": 142, "dateTime": "2025-09-04T09:48:48.1429205", "date": "09/04/2025", "time": "09:48", "timeZone": "UTC", "dayOfWeek": "Thursday", "dstActive": false }
