What is a Unix timestamp?

It's the number of seconds (or, in JavaScript and some APIs, milliseconds) that have elapsed since the Unix epoch — January 1, 1970, 00:00:00 UTC. It's a compact, timezone-independent way to represent a specific instant in time.

Why does my timestamp show the wrong date, like the year 1970 or a date far in the future?

This almost always means a seconds/milliseconds mismatch — feeding a millisecond timestamp into a tool expecting seconds makes the date appear roughly 47,000 years earlier than expected (or vice versa, feeding seconds where milliseconds are expected makes it appear stuck near 1970). Double-check the unit toggle matches what your timestamp actually represents.

How can I tell if a timestamp is in seconds or milliseconds?

As a rule of thumb, current Unix seconds timestamps are 10 digits long (e.g. 1751328000), while current millisecond timestamps are 13 digits long (e.g. 1751328000000). If your number has 13 digits, it's almost certainly milliseconds.

What's the difference between local time and UTC in the results?

UTC (Coordinated Universal Time) is the timezone-independent reference time. Local time is UTC adjusted by your browser's detected timezone offset. The same timestamp always corresponds to a single UTC instant, but displays as a different clock time depending on which timezone you're viewing it from.

Does this tool account for daylight saving time?

Yes. The local time conversion uses your browser's Intl/Date APIs, which automatically apply the correct daylight saving time offset for your detected timezone and the specific date being converted.

What does the ISO 8601 format mean?

ISO 8601 (e.g. 2026-07-01T12:00:00.000Z) is an international standard date format that's unambiguous across languages and locales, always expressed in UTC when it ends in 'Z'. It's the standard format used by JSON APIs, JavaScript's Date.toISOString(), and most modern databases.

Can I convert a date from before 1970?

Yes. Unix timestamps can be negative to represent dates before the epoch (January 1, 1970). This tool's underlying JavaScript Date object supports negative timestamps and will display the correct pre-1970 date.

Does this tool send my data to a server?

No. All timestamp and date conversions use your browser's built-in JavaScript Date object exclusively. No network request is made at any point.

Why does the 'current timestamp' at the top keep changing?

It updates once per second to always reflect the current moment, so you can see a live reference value and copy it with the 'Use current' button whenever you need today's exact epoch value.

What's the maximum or minimum date this tool can represent?

It's bounded by JavaScript's Date object range, which supports roughly ±273,790 years from the Unix epoch (January 1, 1970) — far beyond any realistic timestamp you'd encounter in practice.

Timestamp Converter — Convert Unix Epoch Time to Human-Readable Dates

Our Timestamp Converter converts a Unix epoch timestamp — the number of seconds or milliseconds since January 1, 1970 UTC — into a readable date shown in both your local timezone and UTC, and also works in reverse: pick any date and time and get its corresponding epoch timestamp in both seconds and milliseconds. A live-updating current timestamp is shown at the top, with a one-click button to load it into the converter. All conversion happens instantly using your browser's built-in Date object — no data is sent anywhere.

Current timestamp

—

Timestamp to date

Enter a timestamp above to see the converted date

Date to timestamp

Pick a date above to see the equivalent timestamp

How to Use the Timestamp Converter — Unix Epoch to Date & Back

1
To convert a timestamp to a date: paste the epoch number into the timestamp field and select whether it's in seconds or milliseconds.
2
The corresponding date appears instantly in local time, UTC, and ISO 8601 format — each with its own copy button.
3
To convert a date to a timestamp: use the date/time picker in the second section to select any date and time.
4
The equivalent Unix timestamp appears instantly in both seconds and milliseconds.

Why Use Timestamp Converter — Unix Epoch to Date & Back?

Unix time (epoch time) represents a point in time as the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC — ignoring leap seconds. It's the standard time representation used throughout computing: database timestamps, JWT expiration claims, log file entries, API responses, and cache expiry values are all frequently stored or transmitted as epoch numbers rather than formatted date strings, because it's compact, unambiguous, and trivial to compare or sort. The catch is that a raw epoch number like 1751328000 is meaningless to a human at a glance, and a common source of bugs is confusing seconds-based timestamps (the Unix standard) with milliseconds-based timestamps (what JavaScript's Date.now() returns) — mixing the two produces dates off by a factor of 1000, landing somewhere in 1970 or thousands of years in the future. This tool makes both directions instant and shows results in local time and UTC side by side, so timezone-related confusion when comparing a server log (usually UTC) against your own clock (usually local) is easy to catch.

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