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日付ISO 8601フォーマッター

様々な入力形式の日付をISO 8601形式に変換・解析。数十種類の入力形式に対応。

100% in your browser. Your file never leaves your device.

Enter a date string above.

How to use

  1. Type or paste a date string into the input field in any common format.
  2. Click "Use current date & time" to pre-fill the current moment.
  3. Click Convert — ISO 8601, UTC, date-only, Unix timestamp, and human-readable results appear below.

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よくある質問

Is the date ISO formatter free?
Yes, completely free with no signup and no usage limits.
Does my data leave my device?
No. All parsing and formatting runs in JavaScript inside your browser. Nothing is sent to any server.
Does it work on mobile?
Yes. The tool is mobile-first and works on iPhone Safari and Android Chrome.

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