About this tool
Unix timestamps are everywhere — log files, databases, API payloads, JWT claims — and nobody reads 1735689600 as a date at a glance. This converter translates epoch seconds or milliseconds into human-readable dates and back again, in whatever timezone you care about. Paste a number and it auto-detects seconds versus milliseconds, then shows the equivalent time simultaneously in your local zone, UTC, and a selection of common zones like New York, London and Tokyo. Working the other direction, pick a date and time with the picker or type an ISO 8601 string to get the exact epoch value. A live now panel keeps the current timestamp ticking so you can grab it with one click, which is handy when crafting test fixtures or cache-expiry headers. All conversion uses the browser's internationalization engine, so daylight-saving transitions are handled correctly. It runs fully offline: your log excerpts and internal event times are never transmitted anywhere.
How to use Unix Timestamp Converter
- Paste a Unix timestamp in seconds or milliseconds into the input.
- Read the converted date and time across multiple timezones.
- Or enter a date to convert it back to an epoch value.
- Use the Now button to copy the current timestamp instantly.
Frequently asked questions
Seconds or milliseconds — how do I know?
The tool auto-detects: values with 13 digits are treated as milliseconds, 10 digits as seconds, and the assumption is shown next to the result.
Does it handle timezones correctly?
Yes. Conversion uses the IANA timezone database built into your browser, including daylight-saving rules.
What is the range of supported dates?
Any date JavaScript can represent — roughly plus or minus 100 million days from 1970, far beyond practical needs.
Is anything sent to a server?
No. Everything is computed locally in your browser; the tool works even with the network cable unplugged.