Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates.
Current Unix Timestamp
Starting clock…
Current Time in Timezones
About the Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and back. A Unix timestamp counts the seconds since 1 January 1970 UTC, which makes it compact and timezone-free in storage but unreadable in a log file — this converter closes that gap in both directions.
How to use it
- 1 Paste a Unix timestamp in seconds or milliseconds — the unit is detected automatically.
- 2 Read the result in UTC, in your local timezone, and in ISO 8601.
- 3 To go the other way, enter a date and read off the timestamp.
- 4 Use the current-time button to grab the timestamp for right now.
What it does
- Automatic detection of seconds versus milliseconds
- UTC, local time, and ISO 8601 output side by side
- Reverse conversion from a date back to a timestamp
- Relative time ("3 hours ago") for quick sanity checks
- Live current timestamp
Frequently asked questions
Is my data sent anywhere?
No. Every calculation happens locally in your browser using JavaScript. Nothing you paste is uploaded, logged, or stored on a server, which makes the tool safe to use with production data, credentials, and customer records.
Is my timestamp in seconds or milliseconds?
A present-day timestamp in seconds has 10 digits; in milliseconds it has 13. If you interpret milliseconds as seconds you land tens of thousands of years in the future — that is the usual cause of a date showing as the year 55000. JavaScript's Date uses milliseconds while most backends and databases use seconds.
What is the year 2038 problem?
Systems that store a Unix timestamp in a signed 32-bit integer overflow on 19 January 2038 and wrap to a negative number, reading as 1901. Any modern system using a 64-bit integer is unaffected. It matters for legacy embedded devices and old database columns.
Why does the same timestamp show different times?
A Unix timestamp is always an absolute moment in UTC — it has no timezone. The difference you see is purely how it is displayed. This tool shows UTC and your local time together so the offset is explicit rather than a hidden assumption.
What is ISO 8601 format?
The international standard for writing dates as text, such as 2026-08-02T14:30:00Z. It sorts correctly as a plain string, is unambiguous about day-versus-month order, and the trailing Z means UTC. It is the safest format for APIs and log files.