Developer Tools
Unix Timestamp Converter
Convert Unix timestamps to dates and back, in seconds or milliseconds.
Free foreverRuns in your browserNo sign-up
Timestamp to date
Seconds or milliseconds are both detected automatically.
Date to timestamp
About the Unix Timestamp Converter
A Unix timestamp counts the seconds since 1 January 1970 (UTC), a simple way for computers to store a moment in time.
This tool converts a timestamp into a readable date in UTC, local and ISO 8601 formats, and converts a date back into a Unix timestamp in seconds and milliseconds.
It automatically detects whether your timestamp is in seconds or milliseconds, and everything runs in your browser.
Key features
- Timestamp to UTC, local and ISO date
- Date to Unix seconds and milliseconds
- Auto-detects seconds vs milliseconds
- One-click 'Now' button
How to use
- 1Enter a timestamp to see the matching date, or click Now.
- 2Or pick a date and time to get its Unix timestamp.
- 3Copy the value you need.
Frequently asked questions
- Seconds or milliseconds?
- Both work. The tool treats 13-digit numbers as milliseconds and shorter numbers as seconds, and shows both when converting a date.
- What is the ISO 8601 format?
- ISO 8601 is a standard date format like 2026-08-18T09:30:00.000Z, widely used in APIs and databases because it is unambiguous.