Seconds or milliseconds?

Classic Unix time is in seconds; JavaScript uses milliseconds. Pick the unit that matches your input.

Which timezone is shown?

Local time uses your device's timezone; UTC and ISO are timezone-independent.

A standard date format like 2026-05-27T08:00:00.000Z, widely used in APIs and logs.

Is my data sent anywhere?

No. All conversion happens locally in your browser.

What is the Unix epoch, and what's the 'year 2038 problem'?

The epoch is the reference point — midnight UTC on 1 January 1970 — from which Unix time is counted. Systems that store the count in a signed 32-bit integer overflow on 19 January 2038; modern systems use 64-bit values, which pushes that limit billions of years away.

Can it handle dates before 1970?

Yes. Timestamps before the epoch are simply negative — counting seconds backwards from 1 January 1970 — so dates earlier than 1970 convert correctly in both directions.

Unix Timestamp Converter

Translate between Unix epoch time and human-readable dates in both directions, entirely in your browser. Enter a timestamp to see its local time, UTC and ISO 8601 representations, or pick a date to get its epoch value; the current timestamp updates live as a reference. Both seconds and milliseconds are supported, since systems disagree on which they use — JavaScript works in milliseconds while most Unix tooling uses seconds. Unix time counts the seconds since midnight UTC on 1 January 1970, giving every instant a single unambiguous number independent of time zone, which is why it is the standard way to store and compare moments in software. Everything is computed locally.

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Unix timestamp

How to use

Pick a direction: timestamp → date, or date → timestamp.
Enter a Unix timestamp (choose seconds or milliseconds), or pick a date.
Read the converted values — local, UTC, and ISO.
Copy any value, or grab the current timestamp shown at the top.

Frequently asked questions

Seconds or milliseconds?: Classic Unix time is in seconds; JavaScript uses milliseconds. Pick the unit that matches your input.
Which timezone is shown?: Local time uses your device's timezone; UTC and ISO are timezone-independent.
What is ISO 8601?: A standard date format like 2026-05-27T08:00:00.000Z, widely used in APIs and logs.
Is my data sent anywhere?: No. All conversion happens locally in your browser.
What is the Unix epoch, and what's the 'year 2038 problem'?: The epoch is the reference point — midnight UTC on 1 January 1970 — from which Unix time is counted. Systems that store the count in a signed 32-bit integer overflow on 19 January 2038; modern systems use 64-bit values, which pushes that limit billions of years away.
Can it handle dates before 1970?: Yes. Timestamps before the epoch are simply negative — counting seconds backwards from 1 January 1970 — so dates earlier than 1970 convert correctly in both directions.

Guides on this topic

Working with Time Zones and Unix Timestamps Without Bugs Why time is so hard to get right in software — UTC, Unix timestamps, time zones and DST — and a small set of rules that prevent the most common date-handling bugs.

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