Unix Timestamp Converter
Paste an epoch value or a date and see it in UTC, local time and ISO 8601.
- read as
- now
Output
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Your files stay on your device
This tool runs entirely in your browser. What you paste is processed on your device and is never sent to a server, so it is safe to use with tokens, keys and unpublished text.
Example
Example: the night UK clocks go back, when 01:30 happens twice
A server log in London has two entries stamped 1792888200 and 1792891800: an hour apart, yet both read half past one in the morning on UK clocks. It is Sunday 25 October 2026, when the UK leaves British Summer Time (BST, UTC+1) for Greenwich Mean Time (GMT).
- Paste 1792888200: 10 digits, so it is read as seconds. 1792888200000, with 13 digits, gives the same result read as milliseconds.
- The ISO 8601 (UTC) line gives 2026-10-25T00:30:00.000Z; the local line, on a computer set to UK time, gives Sunday, October 25, 2026 at 1:30:00 AM GMT+1. GMT+1 is BST.
- Paste 1792891800: 2026-10-25T01:30:00.000Z in UTC and 1:30:00 AM GMT locally, the same clock time an hour later.
- The other way round, give the offset: 2026-10-25T01:30:00+01:00 gives 1792888200 and 2026-10-25T01:30:00Z gives 1792891800. Without one, 2026-10-25 01:30 is read as local time and gives the first.
| Unix seconds | ISO 8601 (UTC) | UK clock |
|---|---|---|
| 1774745999 | 2026-03-29T00:59:59Z | Sun 29 Mar 2026, 00:59:59 GMT |
| 1774746000 | 2026-03-29T01:00:00Z | Sun 29 Mar 2026, 02:00:00 BST |
| 1792888200 | 2026-10-25T00:30:00Z | Sun 25 Oct 2026, 01:30:00 BST |
| 1792891800 | 2026-10-25T01:30:00Z | Sun 25 Oct 2026, 01:30:00 GMT |
On 29 March 2026 UK clocks jump from 01:00 to 02:00, so nothing reads 01:30 that night; on 25 October the hour from 01:00 to 02:00 comes round twice. Unix time never jumps, which is why logs are best kept in seconds or UTC and turned into UK time only for reading.
How it works
- Paste a Unix timestamp in seconds (10 digits) or milliseconds (13 digits). The tool detects which one it is by magnitude.
- Or paste a date instead: ISO 8601 such as 2026-09-09T12:00:00Z, or any format your browser's Date parser understands. Leave the box empty for the current time.
- Press Convert. You get the value as seconds and milliseconds, as an ISO 8601 string, as UTC and in your local time zone with its offset.
- Copy the representation you need for your log query, database record or API call.
Frequently asked questions
- What is a Unix timestamp?
- The number of seconds elapsed since 1970-01-01 00:00:00 UTC, the Unix epoch, ignoring leap seconds. Many systems use milliseconds instead (JavaScript, Java), and some use microseconds or nanoseconds. Seconds and milliseconds are recognised automatically here.
- Which time zone is local time?
- The time zone configured in your operating system, as reported by the browser. The UTC and ISO 8601 outputs do not depend on it, so they are safe to share with colleagues in other regions.
- What happens in 2038?
- Systems that store timestamps as signed 32-bit integers overflow on 2038-01-19 at 03:14:07 UTC. This converter uses 64-bit floating point through the browser's Date object, which handles dates hundreds of thousands of years in either direction.
- Why is my date parsed to a different day than I expected?
- A date without a time zone, such as 2026-09-09, is treated as UTC by the ISO parser, while 2026-09-09 12:00 without a Z or offset is treated as local time. Always include Z or an explicit offset like +09:00 to avoid ambiguity.
- How do I convert a timestamp to UK time, GMT or BST?
- The local line uses your computer’s time zone. Set to UK time, it shows GMT in winter and GMT+1, which is BST, from the last Sunday of March to the last Sunday of October: 1774746000 (29 March 2026, 01:00 UTC) reads 2:00:00 AM GMT+1, and one second earlier reads 12:59:59 AM GMT. The UTC and ISO 8601 lines are the same wherever you are.
- What does “day of year” mean in the result?
- The day’s number in its year, counted from 1 January as day 1 in the time zone of the local line: 29 March 2026 is day 88 and 25 October 2026 is day 298. It is the number some log formats and file names use instead of a month and day.
- Is the value sent to a server?
- No. Conversion uses the browser's built-in Date object on your device. Nothing is uploaded.
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