What is a Unix timestamp?

A Unix timestamp counts the number of seconds (or milliseconds) that have passed since 1 January 1970, 00:00:00 UTC — a fixed starting point called "the Unix epoch". It is a simple way for computers to store a moment in time as a single number.

Why are some timestamps 10 digits and others 13 digits?

A 10-digit number is usually Unix seconds; a 13-digit number is usually Unix milliseconds (seconds × 1000). This tool guesses which one you mean based on the number of digits, but you can also choose seconds or milliseconds yourself.

What time zone is shown?

Local Time uses your own browser's time zone setting — it is read from your device, never guessed from your location. UTC is shown separately as a fixed reference point that does not depend on any time zone.

Unix Timestamp Converter

Convert between Unix timestamps and readable dates.

Local Processing

Your input is processed in your browser.

Unix Timestamp

Timestamp

Unit

Private by design

Your data is processed directly in your browser. It is not sent to Stay Local Tools servers for processing. Because the work happens on your device, nothing you type here leaves your browser unless you choose to copy or share it yourself.

Note: the website itself still loads normal web files, and may use analytics or ads later. The promise here is about the files and text you put into these tools.

How to Use

To convert a timestamp to a date: enter the Unix timestamp, or press Use Current Time.
To convert a date to a timestamp: switch to Date to Timestamp and pick a date and time.
Local Time, UTC, ISO 8601 and Unix values all update together.
Copy any result you need.

Unix seconds vs milliseconds

The classic Unix timestamp counts whole seconds since 1 January 1970 UTC. Many modern systems, including JavaScript's own Date object, use milliseconds instead for extra precision — that is simply the seconds value multiplied by 1000. A 10-digit number is almost always seconds; a 13-digit number is almost always milliseconds.

UTC vs local time

UTC (Coordinated Universal Time) is a single, fixed reference time used worldwide — it does not change with daylight saving or location. Local Time shows the same moment converted into your own device's time zone setting, which is far more useful for reading, but will look different for someone in another part of the world viewing the same timestamp.

ISO 8601

ISO 8601 is an international standard for writing dates and times as text, in the form YYYY-MM-DDTHH:mm:ss.sssZ. It sorts correctly as plain text, is unambiguous across countries, and is understood by almost every programming language, which makes it a common choice for storing dates in files and databases.

Questions and Answers

: A Unix timestamp counts the number of seconds (or milliseconds) that have passed since 1 January 1970, 00:00:00 UTC — a fixed starting point called "the Unix epoch". It is a simple way for computers to store a moment in time as a single number.
: A 10-digit number is usually Unix seconds; a 13-digit number is usually Unix milliseconds (seconds × 1000). This tool guesses which one you mean based on the number of digits, but you can also choose seconds or milliseconds yourself.
: Local Time uses your own browser's time zone setting — it is read from your device, never guessed from your location. UTC is shown separately as a fixed reference point that does not depend on any time zone.

Other Languages

Español

Convertir timestamp Unix

Convierte timestamps Unix a fechas legibles y viceversa, mostrando hora local, UTC e ISO 8601. El dato se procesa directamente en tu navegador y no se sube a los servidores de Stay Local Tools para el procesamiento.

Preguntas frecuentes

: Cuenta la cantidad de segundos (o milisegundos) transcurridos desde el 1 de enero de 1970, 00:00:00 UTC, un punto de partida fijo llamado "época Unix".
: Un número de 10 dígitos suele ser segundos Unix; uno de 13 dígitos suele ser milisegundos. Esta herramienta lo detecta automáticamente, pero también puedes elegirlo tú.
: La hora local usa la configuración de zona horaria de tu propio navegador. La UTC se muestra aparte como referencia fija.

Português (Brasil)

Converter timestamp Unix

Converta timestamps Unix em datas legíveis e vice-versa, mostrando horário local, UTC e ISO 8601. O dado é processado diretamente no navegador e não é enviado aos servidores do Stay Local Tools para processamento.

Perguntas frequentes

: Conta a quantidade de segundos (ou milissegundos) desde 1º de janeiro de 1970, 00:00:00 UTC, um ponto de partida fixo chamado "época Unix".
: Um número de 10 dígitos costuma ser segundos Unix; um de 13 dígitos costuma ser milissegundos. Esta ferramenta detecta isso automaticamente, mas você também pode escolher.
: O horário local usa a configuração de fuso horário do seu próprio navegador. O UTC é mostrado separadamente como referência fixa.

한국어

유닉스 타임스탬프 변환

유닉스 타임스탬프를 읽기 쉬운 날짜로, 또는 그 반대로 변환하고 로컬 시간, UTC, ISO 8601을 함께 보여줍니다. 데이터는 브라우저에서 직접 처리되며 Stay Local Tools 서버에 업로드되지 않습니다.

자주 묻는 질문

: 1970년 1월 1일 00:00:00 UTC(유닉스 에포크)부터 지난 초(또는 밀리초) 수를 세는 방식입니다.
: 10자리는 보통 초 단위, 13자리는 보통 밀리초 단위입니다. 이 도구가 자릿수로 자동 판단하지만 직접 선택할 수도 있습니다.
: 로컬 시간은 사용 중인 브라우저의 시간대 설정을 따릅니다. UTC는 시간대와 무관한 고정 기준으로 따로 표시됩니다.