Timestamp Converter は何をしますか？
Timestamp Converter はブラウザ上でデータやファイルを変換するツールで、結果と制限を明確に示します。 検証済みの機能： Seconds through nanoseconds, UTC ISO 8601, IANA time zones, Date-to-epoch conversion.
Store instants; choose zones for display
Use Unix time or offset-bearing ISO 8601 for an instant. Apply an IANA time zone only when presenting that instant as a regional wall time.
使い方
- Paste a timestamp and keep Auto-detect or choose its exact unit.
- Select the time zone used for the readable display.
- Copy the ISO 8601, Unix-second, or millisecond value required by the target system.
実際の入出力例
Convert Unix zero
入力
0 seconds出力
1970-01-01T00:00:00.000ZUnix time zero is the UTC epoch; local displays apply their zone offset to the same instant.
一般的なエラーと対処
| 症状 | 原因 | 対処 |
|---|---|---|
| The year is far in the future. | A millisecond value was interpreted as seconds. | Choose Milliseconds or use Auto-detect on the complete value. |
| The displayed hour differs between systems. | The systems use different time zones or one input lacks an offset. | Compare ISO 8601 UTC output and specify the intended IANA zone. |
Unit and zone assumptions change the display
このツール固有の制限： Treating milliseconds as seconds creates a date far outside the expected year. A local date can also shift when one system assumes UTC and another omits the offset.
標準と実装の参考資料
- MDN — Date (opens in a new tab)Documents JavaScript epoch milliseconds and date conversion.
- MDN — Intl.DateTimeFormat (opens in a new tab)Documents IANA time-zone formatting.
Timestamp Converter — FAQ
How are units detected?
Up to 10 digits is seconds, up to 13 milliseconds, up to 16 microseconds, and longer values nanoseconds.
Does time zone change a timestamp?
No. It changes only the displayed local representation of the same instant.
Is daylight saving time included?
Yes when the browser has current IANA time-zone data.
更新内容
実質的な更新： Timestamp Converter: Added automatic unit detection, bidirectional conversion, ISO 8601 output, selected IANA zones, and relative time.