No servers
Inputs remain on your device.
Unix Timestamp Converter
Convert seconds, milliseconds and UTC dates in both directions.
Calculations happen locally; dates and time zones are not transmitted.
How to use the unix timestamp converter
- 1
Enter the required dates, times or options.
- 2
Select Calculate to run the operation locally.
- 3
Review and copy each format or print the result.
Calendar accuracy in your browser
Explicit rules
Validates ranges, leap years and month changes.
International formats
Uses Intl and IANA to localize results.
Frequently asked questions
What is a Unix timestamp?
It is elapsed time since 1970-01-01 00:00:00 UTC, usually expressed in seconds or milliseconds.
Are my dates sent to a server?
No. Every operation runs in your browser.
Which calendar is used?
It uses the Gregorian calendar and dates from years 1 through 9999.