Unix Timestamp Converter

What is the Unix Timestamp Converter?

This Unix timestamp converter turns epoch numbers into readable dates and readable dates back into epoch numbers, both directions, in one place. Paste a Unix timestamp and the tool instantly shows you the matching moment in your local time zone and in UTC, side by side. Pick a calendar date and time instead, and it gives you back the corresponding epoch in both seconds and milliseconds. A live current timestamp ticks at the top of the page so you can always grab "now" as an epoch value. Everything runs in your browser, with no sign-up and nothing sent to a server.

How to use it

1. To convert epoch to a date, paste your Unix timestamp into the input box. The tool auto-detects whether it is in seconds, milliseconds, or microseconds and shows the result in your local time and in UTC.
2. To convert a date to epoch, switch to the date picker, choose a day and time, and read off the seconds and milliseconds values.
3. To get the current timestamp, read the live ticking value at the top and press copy to capture the exact instant.
4. Press the copy button next to any result to drop it straight into your code, log query, or API call. That is it — one screen, no reload, no account.

The method behind it

A Unix timestamp is a single integer that means the same moment everywhere on Earth: the count of seconds since 00:00:00 UTC on 1 January 1970, the "Unix epoch." To turn that integer back into a date, the tool multiplies it up to a millisecond instant and hands it to JavaScript's Date object, then formats that one instant twice — once in your browser's detected time zone and once in UTC — so the wall-clock difference between them is obvious. Unit detection is based on magnitude: a roughly 10-digit value is read as seconds, 13 digits as milliseconds, and 16 digits as microseconds, and the detected unit is shown back to you so the guess is never hidden. The reverse direction interprets your chosen calendar date in your local zone and divides back down to seconds and milliseconds.

Examples

• Paste 1700000000 → seconds detected → Tue, 14 Nov 2023, 22:13:20 UTC, shown next to the same instant in your local zone.
• Paste 1700000000000 → milliseconds detected → the same moment as above, confirming the auto-detection handled the extra three digits.
• Pick 1 January 2030, 00:00 in the date picker → epoch 1893456000 seconds / 1893456000000 milliseconds, ready to copy into a test fixture.

Common use cases

Developers reach for this when a log line or database row stores a raw epoch and they need the human date to debug an incident. API engineers use it to read iat/exp fields in JWTs, created_at values in JSON responses, and webhook payloads that ship timestamps as integers. QA testers generate future or past epochs to seed fixtures and check expiry logic. Data analysts paste timestamps pulled from event pipelines to sanity-check that a record really landed when it should have. Because both directions and a live "now" are on one screen, it replaces opening a REPL just to run Date.now() or datetime.fromtimestamp().

Why use this one

Most epoch converters make you choose the unit, show only UTC, or hide a copyable "current timestamp" behind another click. This one ticks the live current epoch right on the page, auto-detects seconds versus milliseconds versus microseconds, and prints your local time and UTC side by side so a log value is never ambiguous. It needs no login, imposes no rate limit, and never sends your value anywhere — the conversion happens entirely in your browser.

It is part of a small, focused clock toolkit. To shift a time between cities or zones, the Time Zone Converter handles DST for you. To watch several cities at once, the World Clock lines them up side by side. And to track how long is left until a deadline, the Countdown Timer counts it down for you.

Frequently asked questions