Unix timestamp converter
Mistake: Treating a result as valid outside the described scope.
Fix: Convert Unix seconds, milliseconds and dates; dates without a timezone are interpreted as UTC.
Archive · Free
Unix timestamp converter
Convert Unix seconds or milliseconds to a UTC date, or a date string to a timestamp.
This tool is archived. Recheck its method and dated data before use.
01Enter your values
Runs in your browserRuns offline in your browser. Once the page and required files have loaded, processing needs no internet.
02Unix timestamp converter
Runs in your browser
How it works
Convert Unix seconds or milliseconds to a UTC date, or a date string to a timestamp.
Runs in your browser
Your data stays yours
Inputs are processed on this page and are never sent to a server.
About this tool
Use tool ↑Convert Unix seconds or milliseconds to a UTC date, or a date string to a timestamp.
Convert Unix seconds, milliseconds and dates; dates without a timezone are interpreted as UTC.
- Enter your values
- Value
- From
- Calculation method
Convert Unix seconds or milliseconds to a UTC date, or a date string to a timestamp.
- Example scenario · Result
Sunday, September 13, 2026 at 12:00:00 AM UTC 2026-09-13T00:00:00.000Z
Calculation method
- Convert Unix seconds, milliseconds and dates; dates without a timezone are interpreted as UTC.
Unix timestamp converter
- Value
- 1789257600
- From
- seconds
Result
Sunday, September 13, 2026 at 12:00:00 AM UTC 2026-09-13T00:00:00.000Z
Frequently asked questions
How should I interpret the result?
Convert Unix seconds, milliseconds and dates; dates without a timezone are interpreted as UTC.
Where does my data go?
Calculations run on your device. Form inputs are not sent to a server.
Terms and definitions
Enter your values
- Value
Enter the source text; it is processed locally.
- From
Choose the mode that matches the data you entered.
Options: seconds · seconds · Date
Result
- Result
Convert Unix seconds, milliseconds and dates; dates without a timezone are interpreted as UTC.
Calculated from your entries using the method below.
Common mistakes and quick fixes
Limits and key assumptions
- Convert Unix seconds, milliseconds and dates; dates without a timezone are interpreted as UTC.