タイムゾーンDB APIを使用して時差を変換する

• •HTTP Webhookエンドポイント（n8nが自動生成）
• •ターゲットAPIの認証情報が必要な場合あり

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  "name": "Convert Time Zones with TimeZoneDB API Integration",
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        "content": "## Webhook Input\n\nThis node listens for incoming POST requests. It expects a JSON body with the following properties:\n\n* `fromZone` (source timezone IANA name, e.g., `America/New_York`)\n* `toZone` (target timezone IANA name, e.g., `Europe/London`)\n* `time` (Unix timestamp in seconds, e.g., `1678886400` for March 15, 2023 12:00:00 PM UTC)\n\n**Note:** The TimeZoneDB API key is handled securely by n8n's credential system and should **not** be included in the webhook body."
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      "typeVersion": 1
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      "name": "ノート: TimeZoneDB API 呼び出し",
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        "content": "## TimeZoneDB API Call\n\nThis node makes an HTTP GET request to the TimeZoneDB API's `convert-time-zone` endpoint. It dynamically constructs the URL using the source zone, target zone, and Unix timestamp provided in the webhook body.\n\n**Crucially, the API key is retrieved securely from n8n's pre-configured credentials**, ensuring it is not exposed directly in the workflow's URL parameters or webhook body. This fetches the converted time."
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        "content": "## Webhook Response\n\nThis node sends the conversion result received from the TimeZoneDB API back to the original webhook caller. The response includes the converted time, the time zone names, and status information provided by the API."
      },
      "typeVersion": 1
    },
    {
      "id": "f5e1f969-313f-4ac0-bc53-91bb66556254",
      "name": "時間変換リクエスト受信",
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      "webhookId": "convert-timezone-request",
      "parameters": {
        "path": "convert-timezone",
        "options": {},
        "httpMethod": "POST",
        "responseMode": "responseNode"
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      "typeVersion": 2
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    {
      "id": "f3725910-1f3f-44c8-9c54-3fd4a55ea524",
      "name": "変換時刻で応答",
      "type": "n8n-nodes-base.respondToWebhook",
      "position": [
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      "parameters": {
        "options": {},
        "respondWith": "allIncomingItems"
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      "typeVersion": 1.2
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    {
      "id": "202847ea-f056-455f-970c-758ce5d61e17",
      "name": "タイムゾーン変換 (TimeZoneDB)",
      "type": "n8n-nodes-base.httpRequest",
      "position": [
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      ],
      "parameters": {
        "url": "=http://api.timezonedb.com/v2.1/convert-time-zone?format=json&from={{$json.body.fromZone}}&to={{$json.body.toZone}}&time={{$json.body.time}}",
        "options": {},
        "authentication": "genericCredentialType",
        "genericAuthType": "httpQueryAuth"
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      "credentials": {
        "httpQueryAuth": {
          "id": "RdVVfStIsheYjSeZ",
          "name": "TimeZoneDB API"
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