Tool capabilities
- Input
- Options
- Output
- Options
How to use Unix Timestamp Converter
Use this free Unix Timestamp Converter to translate an epoch timestamp into a readable UTC date, or convert an ISO 8601 date back to Unix time. It supports both seconds and milliseconds, including dates before the Unix epoch.
- Choose Unix → ISO date or ISO date → Unix.
- Select seconds or milliseconds explicitly. Paste the epoch value, or enter an ISO date with Z or a timezone offset.
- Read the converted result and copy it for your log, database query or API request.
Unix Timestamp Converter · Example
Input
1704067200 seconds 1704067200000 milliseconds
Output
2024-01-01T00:00:00.000Z
Both epoch values represent the same instant in UTC.
Usage notes
Unix time counts elapsed seconds from January 1, 1970 at 00:00:00 UTC. The value 0 converts to 1970-01-01T00:00:00.000Z.
Modern timestamps often use 10 digits for seconds or 13 for milliseconds. These lengths are a hint; the converter uses your selected unit rather than guessing.
Milliseconds = seconds × 1,000. For example, 1704067200 seconds and 1704067200000 milliseconds both represent January 1, 2024 at midnight UTC.
The Z suffix means UTC. An ISO date with an explicit offset identifies the same instant across time zones; local clock displays can show a different hour.