Read application logs
Convert epoch timestamps from APIs or logs into a human-readable date and time.
About Unix Timestamp Converter
Unix Timestamp Converter works in both directions between Unix time and human-readable date and time values.
Common use cases
Prepare API parameters
Turn a known date and time into seconds or milliseconds since the Unix epoch.
Debug timezone issues
Compare UTC-based epoch values with a displayed local or selected timezone representation.
How it works
1
A Unix timestamp is interpreted as elapsed seconds or milliseconds from 1970-01-01T00:00:00Z.
2
The browser converts that numeric instant into a calendar date and time.
3
Reverse conversion takes a chosen date-time and calculates its corresponding epoch value.
Privacy & file handling
Timestamp conversion is local
Date and time values are calculated in the browser and do not need to be sent to Zavilo.
Limitations and important notes
- Seconds and milliseconds can be confused; a value interpreted with the wrong unit produces a dramatically different date.
- Timezone display changes the human-readable representation but not the underlying instant.
- Some historical or far-future dates may behave differently across runtime date implementations.
Unix seconds vs milliseconds
| Feature | Precision | Typical magnitude |
|---|---|---|
| Seconds | 1 second | About 10 digits for current dates |
| Milliseconds | 1 millisecond | About 13 digits for current dates |
How to use Unix Timestamp Converter
- 1
Enter a Unix timestamp to convert it to local time and UTC.
- 2
Or choose a local date and time.
- 3
Copy the seconds or milliseconds result.
Tips for better results
- Both Unix seconds and milliseconds are recognized.
- UTC output is shown in ISO format for unambiguous comparison.
Frequently asked questions
Does it accept milliseconds?
Yes. Large timestamp values are treated as milliseconds automatically.