Seconds: - | Milliseconds: -
Real-time Unix timestamp display updated every second, with configurable timezone.
Convert timestamps to human-readable dates and dates back to Unix timestamps.
View conversions in any timezone worldwide — from UTC to your local time and beyond.
Automatically detects whether input is in seconds (10 digits) or milliseconds (13 digits).
Results shown in local time, UTC, ISO 8601, and date-only formats simultaneously.
All conversions happen locally in your browser. No data is sent to any server.
The live clock shows the current Unix timestamp in both seconds and milliseconds, updating every second.
Enter a Unix timestamp (seconds or milliseconds) and click "Convert to Date" to see local time, UTC, ISO 8601, and more.
Select a date and time using the date picker, then click "Convert to Timestamp" to get the Unix timestamp.
Use the timezone selector in the live clock bar to view times in any timezone around the world.
| Timestamp | Date (UTC) | Significance |
|---|---|---|
| 0 | Jan 1, 1970 00:00:00 | Unix Epoch — the starting point |
| 946684800 | Jan 1, 2000 00:00:00 | Y2K / Millennium |
| 1000000000 | Sep 9, 2001 01:46:40 | First 10-digit timestamp |
| 1234567890 | Feb 13, 2009 23:31:30 | Sequential digits milestone |
| 1700000000 | Nov 14, 2023 22:13:20 | Recent major milestone |
| 2000000000 | May 18, 2033 03:33:20 | Next major milestone |
| 2147483647 | Jan 19, 2038 03:14:07 | Y2K38 — 32-bit overflow |
Convert Unix timestamps to human-readable dates and vice versa online free with FreeToolBox. Unix timestamps (also called epoch time or POSIX time) count the seconds elapsed since January 1, 1970 00:00:00 UTC and are the universal time representation in computing. Every programming language, database, log file, and API uses timestamps. Developers constantly need to convert them when debugging API responses, analyzing server logs, querying databases, or coordinating events across timezones.
This converter supports both seconds (10-digit) and milliseconds (13-digit) timestamps with automatic detection. It features a real-time live clock showing the current timestamp, bidirectional conversion (timestamp to date and date to timestamp), output in multiple formats (local time, UTC, ISO 8601), and full timezone support using the Intl API with every IANA timezone. The tool includes a reference table of notable timestamps and runs entirely in your browser — no data is sent anywhere. Completely free, instant, no account required.
Use Timestamp Converter when you need to translate epoch values into human-readable dates or back again. If your next step is validating or formatting a JSON payload containing those timestamps, pair it with JSON Formatter. If the timestamp is inside an encoded URL or query string, pair it with URL Encoder/Decoder.
No-upload workflow: logs, payloads, and schedule data stay in your browser while you convert and inspect time values.
A 10-digit Unix value is usually in seconds, while a 13-digit value is usually in milliseconds. If a converted date looks wildly wrong, check the length first — that's the most common source of confusion.
A Unix timestamp is the number of seconds that have elapsed since January 1, 1970, at UTC — the so-called epoch. It is a fixed, timezone-independent point in time, which makes it convenient for machines but opaque to humans. Because it is defined at UTC, a given timestamp does not have a time zone of its own; the same number refers to the same instant everywhere. When you convert it to a human-readable date, the time zone you apply changes the displayed local time but not the underlying instant.
Many systems store timestamps in milliseconds rather than seconds, and mixing the two is an extremely common bug. A value like 1,700,000,000 can be interpreted as a date in 2023 if it is seconds, or as a date in 1970 if it is mistakenly read as seconds when it was actually milliseconds. When a timestamp converts to a wildly wrong date, the first thing to check is the unit. Some libraries default to milliseconds and some to seconds, so know which one your source uses before you convert.
Because a timestamp is timezone-independent, the only place a time zone enters is when you format the date for a person. To convert properly, decide on the target time zone first, then apply it to the timestamp. Do not add or subtract hours to a timestamp to "adjust" it — the timestamp itself never changes; only its representation does. A reliable conversion gives you the UTC time as the ground truth and lets you choose the display zone separately, rather than baking a time zone into the stored number.