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Free Unix Timestamp Converter

A browser-based Unix timestamp converter that transforms between machine-readable epoch time and human-readable dates. Enter a timestamp in seconds or milliseconds, or paste an ISO date string, and instantly see the UTC time, local time, day of week, and timezone offset. The current timestamp is shown by default for quick reference.

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What is Unix Timestamp Converter?

A browser-based Unix timestamp converter that transforms between machine-readable epoch time and human-readable dates. Enter a timestamp in seconds or milliseconds, or paste an ISO date string, and instantly see the UTC time, local time, day of week, and timezone offset. The current timestamp is shown by default for quick reference.

quickAnswer

Convert Unix timestamps (seconds or ms) to readable dates, or convert dates to timestamps. Shows UTC, local time, and timezone offset. Current timestamp displayed by default.

Last updated: 2026-06-08

limitations

  • Timestamp parsing depends on the browser's Date implementation — exotic date formats beyond ISO 8601 may not parse correctly in all browsers.
  • Does not handle dates before year 1 or after year 275760 (JavaScript Date limits).
  • Time display uses the browser's local timezone — make sure your system clock and timezone are correct for accurate local time display.

Sources:MDN Web Docs · W3C Specifications · jquery.app on GitHub

How to use this tool

  1. Enter a Unix timestamp (seconds or milliseconds) or an ISO date string.
  2. Toggle between seconds and milliseconds input mode.
  3. Toggle between UTC and local time display.
  4. Copy any output value for use in your code or logs.

What you can use it for

  • Convert a Unix timestamp from server logs (e.g., 1716242622) into a readable date to investigate when an event occurred.
  • Get the current Unix timestamp in milliseconds for use in an API request that requires epoch time.
  • Check the timezone offset and UTC equivalent of a local timestamp before storing it in a database.

Use cases

Practical examples

example

Debug a server log entry

A developer finds a log entry with timestamp 1716242622. They paste it into the converter and see it corresponds to May 21, 2026 at 00:43:42 UTC, helping them trace when the error occurred relative to a deployment.

example

Generate a timestamp for an API request

An API requires a timestamp in milliseconds for rate-limiting headers. The developer opens the converter, copies the current Unix timestamp in milliseconds, and includes it in the API request header.

Common mistakes

  • Confusing seconds and milliseconds — a timestamp of 1716242622 (seconds) is May 2026, but 1716242622000 (ms) is the same moment. Using the wrong unit can shift dates by decades.
  • Assuming Unix timestamps are always UTC — they represent moments in time, but display depends on timezone. Always specify UTC when storing or comparing timestamps.
  • Using the local timezone for server-side timestamps — servers should always use UTC to avoid daylight saving time and timezone inconsistencies.

verification

  1. Verify the current timestamp display updates when the page loads and shows a time within a few seconds of your system clock.
  2. Enter timestamp 0 and confirm it shows January 1, 1970 00:00:00 UTC (the Unix epoch).

FAQ

Questions about Unix Timestamp Converter

What is the Unix epoch?

The Unix epoch is January 1, 1970 at 00:00:00 UTC. A Unix timestamp counts the number of seconds (or milliseconds) since that moment. Timestamps before 1970 are negative numbers. The year 2038 problem affects 32-bit systems where the signed 32-bit integer overflows on January 19, 2038.

Should I use seconds or milliseconds?

JavaScript's Date.now() returns milliseconds. Most modern APIs and databases use milliseconds for higher precision. However, many Unix tools (like the date command) and older systems use seconds. Check what your specific system expects — using the wrong unit is the most common timestamp bug.

Does this tool handle timezones?

The converter displays both UTC and your browser's local time. The underlying timestamp is always UTC — timezones only affect display. When storing timestamps, always save the raw epoch value (which is timezone-independent) rather than a formatted date string.

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