質問編集履歴
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```JavaScript
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var startJSTday
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var normalizedDateStr = startJSTday.replace(/Z$/, '+09:00');
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var d = new Date(startJSTday);
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d.setMinutes(d.getMinutes() + d.getTimezoneOffset()); // timezoneOffset: -540 (only Japan)
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return new Date(normalizedDateStr).toISOString();
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```
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[参考にしたサイト](https://confrage.jp/ecma-script6%EF%BC%88javascript%EF%BC%89%E3%81%AEnew-date%E3%82%92utc%E3%81%8B%E3%82%89jst%E3%81%AB%E5%A4%89%E6%8F%9B%E3%81%99%E3%82%8B%E6%96%B9%E6%B3%95/)。
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### ご回答を受けてのメモ。
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```JavaScript
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var startJSTday = '2018-11-07T15:00:00.000Z';
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var d = new Date(startJSTday);
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d.setMinutes(d.getMinutes() + d.getTimezoneOffset()); // timezoneOffset: -540 (only Japan)
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console.log(d.toISOString()); //2018-11-07T06:00:00.000Z
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```
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修正
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```JavaScript
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startJSTday = '2018-11-07T15:00:00.000Z';
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console.log(startJSTday); //2018-11-07T15:00:00.000Z
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