How to use the Unix Timestamp Converter
- Enter or paste your input in the tool above.
- Choose the available options and select Run tool or Process locally.
- Review, copy, or download the generated result.
What does the Unix Timestamp Converter do?
Unix time counts elapsed time from 1970-01-01T00:00:00Z. The converter distinguishes common 10-digit second values from longer millisecond values and shows an unambiguous ISO result.
Common uses
- Debug API created_at and expires_at fields
- Compare seconds with JavaScript milliseconds
- Turn log timestamps into readable dates
Unix Timestamp Converter example
Example input
1704067200Example output
{
"iso": "2024-01-01T00:00:00.000Z",
"unixSeconds": 1704067200,
"unixMilliseconds": 1704067200000
}Limitations and important notes
- Local display depends on the browser timezone
- Ambiguous date strings may be interpreted differently
- Leap seconds are not represented by standard Unix timestamps
Private browser-based processing
Your data is processed locally in your browser and is not uploaded or stored on our servers. Tool inputs are not saved to local storage.
Unix Timestamp Converter features
- Free to use with no registration
- Fast client-side processing
- Clear validation and useful error messages
- Copy and download support
- Mobile-friendly accessible interface
Frequently asked questions
How do I know whether a timestamp uses seconds or milliseconds?
Modern Unix seconds commonly have 10 digits, while JavaScript millisecond timestamps commonly have 13.
Why is the local date different from ISO?
ISO output is shown in UTC, while local output uses your browser timezone.
Is the Unix Timestamp Converter free to use?
Yes. The Unix Timestamp Converter is completely free and requires no account or installation.
Is my data uploaded when using Unix Timestamp Converter?
No. Your input and result are processed locally inside your browser and are not sent to our server.
Can I use Unix Timestamp Converter on mobile?
Yes. The tool works in modern desktop and mobile browsers.