タイムスタンプ変換
Unix 時刻と日時の相互変換・ライブ時計
Current time
Local: Sat May 02 2026 20:21:54 GMT+0000 (Coordinated Universal Time)
Timestamp → date
Enter a Unix value. Values with absolute magnitude ≥ 100,000,000,000 are treated as milliseconds; smaller integers as seconds.
Date → timestamp
Fill local date/time fields, or paste an ISO 8601 string (ISO takes precedence when non-empty).
Convert Unix timestamps to dates and back, with a live clock
Logs, databases, and APIs love Unix timestamps; humans don't. A timestamp converter handles both directions — epoch seconds or milliseconds in, ISO and human-readable dates out, plus the reverse — and shows the current time as a live clock so you can grab a fresh value while debugging.
Use the converter when you need to
Read a timestamp from a log line
Paste epoch seconds or milliseconds and instantly see the date in your local timezone and UTC.
Construct a test value for an API
Build a date in human form and copy the corresponding Unix timestamp for use in a request body.
Check token expiry by hand
Decode a JWT, copy the exp claim, and convert it to a real date to confirm whether the token is expired.
How to convert timestamps quickly
- 1
Paste a Unix timestamp or pick a date in the form fields.
- 2
View the converted ISO string, local date, and UTC date in real time.
- 3
Use Now, Start of today, or Start of year buttons for common reference points.
Keep going
Generate IDs
Pair timestamps with UUIDs when building traceable records or request IDs.
Decode JWT tokens
Read the iat, nbf, and exp claims and convert them back to dates with this tool.
Send a test request
Plug a fresh timestamp into an API request body and verify the endpoint behavior.
Format JSON with timestamps
Clean up payloads that include epoch fields before pasting them somewhere else.
Common timestamp workflows
Convert the epoch in the log to local time to align with what a customer reported.
Confirm a recently issued JWT's exp claim corresponds to the lifetime your auth provider configured.
Generate a known epoch value and use it across tests for deterministic results.
関連ツール
よくある質問
どちらも使えます。絶対値が100,000,000,000未満の整数は秒として扱い、それより大きい値はミリ秒として扱います。出力は常に秒とミリ秒の両方を表示します。
年/月/日/時/分/秒の数値フィールドは、あなたのローカルタイムゾーンとして解釈されます。ISO文字列はJavaScriptのDate標準ルールでパースされ、Zやオフセットがあればそれが適用されます。
Nowは現在時刻（現在の瞬間）を入力します。Start of todayは当日のローカル0:00を設定します。Start of yearは今年の1月1日 00:00:00（ローカル時刻）を設定します。
ライブクロックが1秒ごとに更新されるためです。APIテストやログ確認の際に、最新のUnix timestampをすぐコピーできます。