unixtimestamp.live

About unixtimestamp.live

unixtimestamp.live is a free set of tools for working with Unix timestamps, plus reference material explaining the concepts underneath them. It exists because converting epoch time is something developers do constantly, and most of the available tools either bury the answer in advertising or get time zones subtly wrong.

What is here

  • A two-way converter handling seconds, milliseconds, microseconds and nanoseconds, with automatic unit detection.
  • A batch converter for whole columns from logs and CSV exports.
  • A live epoch clock and a countdown to any timestamp.
  • Pages for all 419 IANA time zones, with current offsets and this year's daylight saving dates.
  • Code examples in 21 languages, including the pitfalls specific to each.
  • Guides covering Unix time, the Year 2038 problem, ISO 8601, leap seconds, daylight saving bugs and database storage.

How it works

Every conversion runs in your browser. There is no API, no backend and no upload step — the tools use the Intl and Date APIs built into your browser, including the IANA time zone database that ships with it. Nothing you type leaves your device.

That has two practical consequences. The tools work offline once a page has loaded, and the batch converter is safe to use on production data, because there is nowhere for that data to go. You can confirm this yourself with your browser's network inspector.

Principles

  • The answer comes first. The converter is at the top of every page, not below several screens of preamble.
  • Correctness over convenience. Daylight saving is applied for the date being converted, not for today. Offsets that are not whole hours work properly. Negative timestamps work.
  • Fast. Pages are static HTML with a few kilobytes of JavaScript. No frameworks, no web fonts, no layout shift.
  • No accounts, no tracking. Nothing to sign up for, and no first-party tracking cookies. See the privacy policy.

How it is paid for

Hosting is funded by advertising. Ads are placed below the tool rather than around it, and slots reserve their space in the layout so that content never jumps as they load. If that balance ever stops feeling reasonable, the ads are the part that changes.

Corrections

Time zone handling has a great many edge cases and it is entirely possible something here is wrong. If you find an incorrect conversion, a stale time zone rule or a mistake in a guide, please get in touch — corrections are welcome and will be made promptly.