Unix タイムスタンプ → 日時 変換 オンライン — 無料 Epoch 変換
Unix エポック秒と人間可読の日付を相互変換。ミリ秒、ISO 8601、ローカルタイムゾーンに対応。
Unix タイムスタンプ (秒またはミリ秒) または ISO 日付を貼り付けると、両方の表現を並べて表示します。
Now (seconds)
0
Now (milliseconds)
0
Now (ISO 8601)
よくある利用例
- 1Translate an exp claim from a JWT into a human-readable expiry time.
- 2Convert a created_at log field into your local timezone for debugging.
- 3Plan cron schedules — confirm an epoch value matches the moment you expect it.
よくある質問
Why are some timestamps 13 digits and others 10?+
10 digits = seconds since 1970-01-01 UTC. 13 digits = milliseconds. The tool detects both automatically based on length.
Does it handle leap seconds?+
No. Unix time intentionally ignores leap seconds — they are smeared at the OS level. This converter follows the same convention as every standard library.
What timezone is shown?+
ISO 8601 output is always UTC. The "Local" line uses your browser locale and timezone via Intl.DateTimeFormat.