Unix Timestamp Converter
Converts between Unix epoch timestamps and human-readable UTC or ISO date-times in seconds or milliseconds.
Input
Output
Enter values to see the result.
Runs entirely in your browser. Your input is not uploaded or stored.
How to use this calculator
- Enter a Unix timestamp to get the date, or a date/time to get the timestamp.
- Copy the result.
How it works
A Unix timestamp is seconds (or milliseconds) since 1 Jan 1970 UTC. The tool converts both ways and auto-detects seconds vs milliseconds.
Worked example
0. = 1970-01-01T00:00:00.000Z.
Tips
- Runs entirely in your browser. Your input is not uploaded or stored.
Frequently asked questions
Seconds or milliseconds?
Both — values above ~1e12 are treated as milliseconds, otherwise seconds.
Privacy?
Runs entirely in your browser. Your input is not uploaded or stored.
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Cite this tool
Zerdly. (2026). Unix Timestamp Converter. Retrieved from https://www.zerdly.com/tools/unix-timestamp-converter/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.