Timestamp Converter
Convert between Unix timestamps and readable dates.
Runs entirely in your browser — your data is never uploaded to any server.
How it works
- Enter a valueA timestamp or a readable date.
- Convert itThe direction is detected for you.
- Read the resultUTC, local time and ISO 8601.
What this tool does
- Two-way conversion with automatic direction detection
- Seconds and milliseconds, detected by magnitude
- UTC, local time, ISO 8601 and relative time
- One-click "now" for the current timestamp
Frequently Asked Questions
The number of seconds elapsed since 1 January 1970 UTC. It is timezone-independent, which is why systems use it internally.
Ten digits is seconds; thirteen is milliseconds. JavaScript uses milliseconds while most backends use seconds.
Systems storing the timestamp in a signed 32-bit integer overflow in January 2038. Modern platforms use 64-bit values and are unaffected.
Both — results are shown in UTC and in your browser's local timezone.
Privacy and security
Your input is processed by JavaScript running inside your browser. Nothing you paste is sent over the network, logged, or stored — which is what makes this safe to use with production data. If you want to check this yourself: open your browser’s developer tools, switch to the Network tab, and use the tool — you will see no request carrying your file or input leave the page.