Unix timestamp
Convert between a Unix timestamp and a readable date. Results show UTC, your local time zone, and both second and millisecond values. The input box is left unchanged.
It runs in your browser. What you enter stays on this device.
How to use it
- 1Paste a timestamp or an ISO 8601 date.
- 2Choose whether you are starting from a timestamp or a date.
- 3If it is a timestamp, choose seconds or milliseconds.
- 4Choose Convert. Copy the result, or choose Clear to start over.
When it helps
- Read a timestamp from a log as UTC and local time.
- Turn a known UTC date into seconds for an API.
- Check whether a value is in seconds or milliseconds by comparing the two results.
Good to know
- Dates must be ISO 8601, such as 2026-10-19 or 2026-10-19T15:00:00Z. A date and time without Z or an offset is rejected because it is ambiguous.
- A date with no time is read as 00:00:00 UTC.
- The timestamp unit applies to numeric input. The result always lists both Unix seconds and Unix milliseconds.
- Unix seconds are truncated toward zero. The millisecond field keeps the exact value.
- Local time uses this browser's time zone and a 24-hour clock. Month names are English.
- The input stays under 500 KB.
Questions
Which time zone is the local time?
It is the time zone of the browser you are using now. UTC is always shown as an ISO 8601 value ending in Z, separate from the local line.
Is the value uploaded?
No. The conversion runs in this browser. The value is not sent to a server or included in analytics.
Related tools
JWT decoder JWT decoder
Decode a JWT header and payload in the browser. The signature is not verified.
Developer
JSON formatter JSON formatter
Check JSON, then format or minify it in the browser.
Developer