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Unix Timestamp Online

Turn a Unix (epoch) timestamp into UTC, local and ISO time.

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This tool runs in your browser. No account or signup is required.

Common Unix Timestamp tasks

Developers typically reach for this page when they need to convert Unix time to a date; convert a date to Unix timestamp; convert Unix seconds to milliseconds. The tool is built for quick, practical work rather than a generic demo.

What matters in a unix timestamp workflow

When developers compare online tools for this job, the useful capabilities tend to center on current Unix time, seconds/ms, UTC/local, epoch explanation. This page keeps those practical needs in mind while linking to related tools when a different workflow is a better fit.

What is Unix Timestamp?

Unix Timestamp converts a number or date string into UTC, local time, ISO 8601, and Unix time in seconds and milliseconds. The box starts with the current time.

What problem does it solve?

Logs, databases and APIs store time as numbers that nobody can read at a glance, and mixing up seconds and milliseconds is an easy mistake.

How to use Unix Timestamp

  1. Enter a Unix timestamp or a date string.
  2. The conversions appear as you type.
  3. Copy the result.

Example

Input

0

Output

ISO: 1970-01-01T00:00:00.000Z
Unix (ms): 0
Unix (s): 0

What you can do with Unix Timestamp

  • Unix timestamp converter
  • Epoch to date
  • What date is this Unix time?

Common use cases

  • Reading timestamps in logs and database rows
  • Checking token expiry times
  • Converting a date into epoch seconds for an API

Related developer tasks

  • Unix timestamp converter
  • Epoch to date
  • What date is this Unix time?

What is a Unix timestamp?

A Unix timestamp, or epoch time, counts the time elapsed since 1 January 1970 00:00:00 UTC. It has no time zone, which is why APIs, databases and JWT claims such as exp and iat use it.

The page opens with the current time in seconds already filled in, so you can copy the current Unix timestamp right away.

Seconds or milliseconds?

  • 10 digits, such as 1700000000, is normally seconds (JWT, most Unix tools).
  • 13 digits, such as 1700000000000, is normally milliseconds (JavaScript Date.now()).
  • Pasting the wrong unit gives a date in 1970 or the far future, which is the quickest way to spot the mix-up.

Related: Timestamp Converter, JWT Decoder, Number Base Converter

Unix Timestamp FAQ

Seconds or milliseconds?

All-digit input longer than 11 digits is treated as milliseconds; shorter input is treated as seconds.

Which time zone is used?

Both UTC and your browser's local time zone are shown.

Why does my Unix timestamp show 1970?

The number is probably in seconds being read as a smaller unit, or it is 0 or a very small value. Check whether your source uses seconds or milliseconds.

Looking for something else? Browse all developer tools.

onlinedevelopertool.com is a collection of 54 free, browser-based utilities for the small jobs that interrupt real work: formatting a JSON response, decoding a token, converting a timestamp, generating a UUID or checking a hash. Each tool has its own page with a short explanation, a worked example and answers to common questions, so you can use it and learn what it does at the same time.

There is no account to create and nothing to install. Tools run in your browser, so the text you paste is processed on your own device. The one exception is the Website Status Checker, which sends a request from your browser to the address you enter.

Three steps: paste your input, click the tool, copy the result, all inside your browser
Popular developer utilities: JWT decoder, UUID generator, Base64 decoder, SHA-256 hash, regex tester and timestamp converter

What you can do here

  • JSON Tools

    Format, validate, beautify and minify JSON, generate C#, TypeScript, Java, Python, Go, PHP and Kotlin models from it, or convert between JSON, YAML and CSV.

  • Encoders & Decoders

    URL, Base64 and HTML encoding and decoding, plus a JWT decoder for reading token claims.

  • Generators & Hashes

    Generate UUIDs and JWTs, validate UUIDs, and create MD5, SHA-256 and SHA-512 hashes.

  • Web Tools

    Timestamps, color codes, query strings and cron expressions - the small things web work keeps throwing at you.

  • Text & Data

    Format XML and YAML, count text, change case, make slugs, test regex, diff two texts and convert number bases.

  • Website Checking

    Check whether a website or URL is reachable from your browser.

Quick developer reference

  • JSON

    Keys and strings must use double quotes, and trailing commas and comments are not allowed. Those are the three most common reasons a payload fails to parse.

    Validate JSON

  • JWT

    A JSON Web Token is three Base64URL parts joined by dots: header, payload and signature. Decoding shows the claims but does not prove the token is genuine; only signature verification does.

    Decode a JWT

  • Base64

    Base64 is an encoding, not encryption. Anyone can reverse it, and it makes data roughly one third larger, so never use it to hide secrets.

    Decode Base64

  • UUID

    A version 4 UUID is made of random bits and written as 8-4-4-4-12 hexadecimal characters. Collisions are astronomically unlikely, which is why they work well as identifiers.

    Generate a UUID

  • Timestamps

    A Unix timestamp counts time since 1 January 1970 UTC. Ten digits usually means seconds and thirteen digits usually means milliseconds.

    Convert a timestamp

  • Hashes

    MD5 is fine for quick checksums but is not safe for security. Prefer SHA-256 or SHA-512, and remember that hashing is one-way and is not encryption.

    Create a SHA-256 hash

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