Unix Timestamp Converter – Seconds or milliseconds to dates
Paste a Unix epoch value, click Convert, and read UTC as an ISO string plus your local clock string. Values with 13 or more digits are treated as milliseconds; shorter ones as seconds.
Updated 2026-08-03 · time
Click Convert.
About this tool
Unix time counts seconds or milliseconds since 1970-01-01 UTC. This converter takes one numeric field, detects second versus millisecond length, builds a Date, then prints UTC and Local lines—or Invalid timestamp when the value cannot be parsed.
How to use
- Open the converter: Load Unix Timestamp Converter in a modern browser.
- Enter the timestamp: Paste seconds or a 13-digit millisecond value into Unix timestamp.
- Convert: Click Convert to build the Date from your number.
- Read UTC and Local: Use the UTC ISO line and Local line in the result.
Common use cases
- Decode a log timestamp into a human-readable UTC time.
- Confirm whether a value is in seconds or milliseconds by checking the output.
- Compare UTC ISO against your local timezone string for the same instant.
Tips
- Non-numeric input yields Invalid timestamp—paste digits only.
- The field preloads the current epoch seconds so you can Convert immediately.
FAQ
How are seconds and milliseconds chosen?
Truncated digit length of 13 or more means milliseconds; otherwise the value is treated as seconds.
What formats appear in the result?
UTC as an ISO string and Local as the browser date string.
Why do I see Invalid timestamp?
The number is not finite or does not produce a valid Date.
Can I convert a date back to a timestamp?
Not on this page—it only converts timestamp to UTC and local text.